Update autoconf test for gcc to require 4.7 and up
[ghc.git] / aclocal.m4
1 # Extra autoconf macros for the Glasgow fptools
2 #
3 # To be a good autoconf citizen, names of local macros have prefixed with FP_ to
4 # ensure we don't clash with any pre-supplied autoconf ones.
5
6
7 AC_DEFUN([GHC_SELECT_FILE_EXTENSIONS],
8 [
9     $2=''
10     $3='.so'
11     case $1 in
12     *-unknown-cygwin32)
13         AC_MSG_WARN([GHC does not support the Cygwin target at the moment])
14         AC_MSG_WARN([I'm assuming you wanted to build for i386-unknown-mingw32])
15         exit 1
16         ;;
17     # examples: i386-unknown-mingw32, i686-w64-mingw32, x86_64-w64-mingw32
18     *-mingw32)
19         windows=YES
20         $2='.exe'
21         $3='.dll'
22         ;;
23     # apple platform uses .dylib (macOS, iOS, ...)
24     *-apple-*)
25         $3='.dylib'
26         ;;
27     esac
28 ])
29
30 # FPTOOLS_SET_PLATFORM_VARS
31 # ----------------------------------
32 # Set the platform variables
33 AC_DEFUN([FPTOOLS_SET_PLATFORM_VARS],
34 [
35     # If no argument was given for a configuration variable, then discard
36     # the guessed canonical system and use the configuration of the
37     # bootstrapping ghc. If an argument was given, map it from gnu format
38     # to ghc format.
39     #
40     # For why we do it this way, see: #3637, #1717, #2951
41     #
42     # In bindists, we haven't called AC_CANONICAL_{BUILD,HOST,TARGET}
43     # so this justs uses $bootstrap_target.
44
45     if test "$build_alias" = ""
46     then
47         if test "$bootstrap_target" != ""
48         then
49             build=$bootstrap_target
50             echo "Build platform inferred as: $build"
51         else
52             echo "Can't work out build platform"
53             exit 1
54         fi
55
56         BuildArch=`echo "$build" | sed 's/-.*//'`
57         BuildVendor=`echo "$build" | sed -e 's/.*-\(.*\)-.*/\1/'`
58         BuildOS=`echo "$build" | sed 's/.*-//'`
59     else
60         GHC_CONVERT_CPU([$build_cpu], [BuildArch])
61         GHC_CONVERT_VENDOR([$build_vendor], [BuildVendor])
62         GHC_CONVERT_OS([$build_os], [$BuildArch], [BuildOS])
63     fi
64
65     if test "$host_alias" = ""
66     then
67         if test "$bootstrap_target" != ""
68         then
69             host=$bootstrap_target
70             echo "Host platform inferred as: $host"
71         else
72             echo "Can't work out host platform"
73             exit 1
74         fi
75
76         HostArch=`echo "$host" | sed 's/-.*//'`
77         HostVendor=`echo "$host" | sed -e 's/.*-\(.*\)-.*/\1/'`
78         HostOS=`echo "$host" | sed 's/.*-//'`
79     else
80         GHC_CONVERT_CPU([$host_cpu], [HostArch])
81         GHC_CONVERT_VENDOR([$host_vendor], [HostVendor])
82         GHC_CONVERT_OS([$host_os], [$HostArch], [HostOS])
83     fi
84
85     if test "$target_alias" = ""
86     then
87         if test "$host_alias" != ""
88         then
89             GHC_CONVERT_CPU([$host_cpu], [TargetArch])
90             GHC_CONVERT_VENDOR([$host_vendor], [TargetVendor])
91             GHC_CONVERT_OS([$host_os], [$TargetArch],[TargetOS])
92         else
93             if test "$bootstrap_target" != ""
94             then
95                 target=$bootstrap_target
96                 echo "Target platform inferred as: $target"
97             else
98                 echo "Can't work out target platform"
99                 exit 1
100             fi
101
102             TargetArch=`echo "$target" | sed 's/-.*//'`
103             TargetVendor=`echo "$target" | sed -e 's/.*-\(.*\)-.*/\1/'`
104             TargetOS=`echo "$target" | sed 's/.*-//'`
105         fi
106     else
107         GHC_CONVERT_CPU([$target_cpu], [TargetArch])
108         GHC_CONVERT_VENDOR([$target_vendor], [TargetVendor])
109         GHC_CONVERT_OS([$target_os], [$TargetArch], [TargetOS])
110     fi
111
112     GHC_LLVM_TARGET([$target_cpu],[$target_vendor],[$target_os],[LlvmTarget])
113
114     GHC_SELECT_FILE_EXTENSIONS([$host], [exeext_host], [soext_host])
115     GHC_SELECT_FILE_EXTENSIONS([$target], [exeext_target], [soext_target])
116     windows=NO
117     case $host in
118     *-unknown-mingw32)
119         windows=YES
120         ;;
121     esac
122
123     BuildPlatform="$BuildArch-$BuildVendor-$BuildOS"
124     BuildPlatform_CPP=`echo "$BuildPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
125     BuildArch_CPP=`    echo "$BuildArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
126     BuildVendor_CPP=`  echo "$BuildVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
127     BuildOS_CPP=`      echo "$BuildOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
128
129     HostPlatform="$HostArch-$HostVendor-$HostOS"
130     HostPlatform_CPP=`echo "$HostPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
131     HostArch_CPP=`    echo "$HostArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
132     HostVendor_CPP=`  echo "$HostVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
133     HostOS_CPP=`      echo "$HostOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
134
135     TargetPlatform="$TargetArch-$TargetVendor-$TargetOS"
136     TargetPlatform_CPP=`echo "$TargetPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
137     TargetArch_CPP=`    echo "$TargetArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
138     TargetVendor_CPP=`  echo "$TargetVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
139     TargetOS_CPP=`      echo "$TargetOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
140
141     # we intend to pass trough --targets to llvm as is.
142     LLVMTarget_CPP=`    echo "$LlvmTarget"`
143
144     echo "GHC build  : $BuildPlatform"
145     echo "GHC host   : $HostPlatform"
146     echo "GHC target : $TargetPlatform"
147     echo "LLVM target: $LlvmTarget"
148
149     AC_SUBST(BuildPlatform)
150     AC_SUBST(HostPlatform)
151     AC_SUBST(TargetPlatform)
152     AC_SUBST(HostPlatform_CPP)
153     AC_SUBST(BuildPlatform_CPP)
154     AC_SUBST(TargetPlatform_CPP)
155
156     AC_SUBST(HostArch_CPP)
157     AC_SUBST(BuildArch_CPP)
158     AC_SUBST(TargetArch_CPP)
159
160     AC_SUBST(HostOS_CPP)
161     AC_SUBST(BuildOS_CPP)
162     AC_SUBST(TargetOS_CPP)
163     AC_SUBST(LLVMTarget_CPP)
164
165     AC_SUBST(HostVendor_CPP)
166     AC_SUBST(BuildVendor_CPP)
167     AC_SUBST(TargetVendor_CPP)
168
169     AC_SUBST(exeext_host)
170     AC_SUBST(exeext_target)
171     AC_SUBST(soext_host)
172     AC_SUBST(soext_target)
173 ])
174
175
176 # FPTOOLS_SET_HASKELL_PLATFORM_VARS
177 # ----------------------------------
178 # Set the Haskell platform variables
179 AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS],
180 [
181     checkArch() {
182         case [$]1 in
183         i386)
184             test -z "[$]2" || eval "[$]2=ArchX86"
185             ;;
186         x86_64|amd64)
187             test -z "[$]2" || eval "[$]2=ArchX86_64"
188             ;;
189         powerpc)
190             test -z "[$]2" || eval "[$]2=ArchPPC"
191             ;;
192         powerpc64)
193             test -z "[$]2" || eval "[$]2=\"ArchPPC_64 {ppc_64ABI = ELF_V1}\""
194             ;;
195         powerpc64le)
196             test -z "[$]2" || eval "[$]2=\"ArchPPC_64 {ppc_64ABI = ELF_V2}\""
197             ;;
198         sparc)
199             test -z "[$]2" || eval "[$]2=ArchSPARC"
200             ;;
201         sparc64)
202             test -z "[$]2" || eval "[$]2=ArchSPARC64"
203             ;;
204         arm)
205             GET_ARM_ISA()
206             test -z "[$]2" || eval "[$]2=\"ArchARM {armISA = \$ARM_ISA, armISAExt = \$ARM_ISA_EXT, armABI = \$ARM_ABI}\""
207             ;;
208         aarch64)
209             test -z "[$]2" || eval "[$]2=ArchARM64"
210             ;;
211         alpha)
212             test -z "[$]2" || eval "[$]2=ArchAlpha"
213             ;;
214         mips|mipseb)
215             test -z "[$]2" || eval "[$]2=ArchMipseb"
216             ;;
217         mipsel)
218             test -z "[$]2" || eval "[$]2=ArchMipsel"
219             ;;
220         hppa|hppa1_1|ia64|m68k|rs6000|s390|s390x|sh4|vax)
221             test -z "[$]2" || eval "[$]2=ArchUnknown"
222             ;;
223         *)
224             echo "Unknown arch [$]1"
225             exit 1
226             ;;
227         esac
228     }
229
230     checkVendor() {
231         case [$]1 in
232         dec|none|unknown|hp|apple|next|sun|sgi|ibm|montavista|portbld|alpine)
233             ;;
234         *)
235             AC_MSG_WARN([Unknown vendor [$]1])
236             ;;
237         esac
238     }
239
240     checkOS() {
241         case [$]1 in
242         linux|linux-android)
243             test -z "[$]2" || eval "[$]2=OSLinux"
244             ;;
245         darwin|ios)
246             test -z "[$]2" || eval "[$]2=OSDarwin"
247             ;;
248         solaris2)
249             test -z "[$]2" || eval "[$]2=OSSolaris2"
250             ;;
251         mingw32)
252             test -z "[$]2" || eval "[$]2=OSMinGW32"
253             ;;
254         freebsd)
255             test -z "[$]2" || eval "[$]2=OSFreeBSD"
256             ;;
257         dragonfly)
258             test -z "[$]2" || eval "[$]2=OSDragonFly"
259             ;;
260         kfreebsdgnu)
261             test -z "[$]2" || eval "[$]2=OSKFreeBSD"
262             ;;
263         openbsd)
264             test -z "[$]2" || eval "[$]2=OSOpenBSD"
265             ;;
266         netbsd)
267             test -z "[$]2" || eval "[$]2=OSNetBSD"
268             ;;
269         haiku)
270             test -z "[$]2" || eval "[$]2=OSHaiku"
271             ;;
272         nto-qnx)
273             test -z "[$]2" || eval "[$]2=OSQNXNTO"
274             ;;
275         dragonfly|hpux|linuxaout|freebsd2|gnu|nextstep2|nextstep3|sunos4|ultrix)
276             test -z "[$]2" || eval "[$]2=OSUnknown"
277             ;;
278         aix)
279             test -z "[$]2" || eval "[$]2=OSAIX"
280             ;;
281         *)
282             echo "Unknown OS '[$]1'"
283             exit 1
284             ;;
285         esac
286     }
287
288     dnl ** check for Apple-style dead-stripping support
289     dnl    (.subsections-via-symbols assembler directive)
290
291     AC_MSG_CHECKING(for .subsections_via_symbols)
292     AC_COMPILE_IFELSE(
293         [AC_LANG_PROGRAM([], [__asm__ (".subsections_via_symbols");])],
294         [AC_MSG_RESULT(yes)
295          HaskellHaveSubsectionsViaSymbols=True
296          AC_DEFINE([HAVE_SUBSECTIONS_VIA_SYMBOLS],[1],
297                    [Define to 1 if Apple-style dead-stripping is supported.])
298         ],
299         [HaskellHaveSubsectionsViaSymbols=False
300          AC_MSG_RESULT(no)])
301
302     dnl ** check for .ident assembler directive
303
304     AC_MSG_CHECKING(whether your assembler supports .ident directive)
305     AC_COMPILE_IFELSE(
306         [AC_LANG_SOURCE([__asm__ (".ident \"GHC x.y.z\"");])],
307         [AC_MSG_RESULT(yes)
308          HaskellHaveIdentDirective=True],
309         [AC_MSG_RESULT(no)
310          HaskellHaveIdentDirective=False])
311
312     dnl *** check for GNU non-executable stack note support (ELF only)
313     dnl     (.section .note.GNU-stack,"",@progbits)
314
315     dnl This test doesn't work with "gcc -g" in gcc 4.4 (GHC trac #3889:
316     dnl     Error: can't resolve `.note.GNU-stack' {.note.GNU-stack section} - `.Ltext0' {.text section}
317     dnl so we empty CFLAGS while running this test
318     CFLAGS2="$CFLAGS"
319     CFLAGS=
320     case $TargetArch in
321       arm)
322         dnl See #13937.
323         progbits="%progbits"
324         ;;
325       *)
326         progbits="@progbits"
327         ;;
328     esac
329     AC_MSG_CHECKING(for GNU non-executable stack support)
330     AC_COMPILE_IFELSE(
331         [AC_LANG_PROGRAM([__asm__ (".section .note.GNU-stack,\"\",$progbits");], [0])],
332         [AC_MSG_RESULT(yes)
333          HaskellHaveGnuNonexecStack=True],
334         [AC_MSG_RESULT(no)
335          HaskellHaveGnuNonexecStack=False])
336     CFLAGS="$CFLAGS2"
337
338     checkArch "$BuildArch" "HaskellBuildArch"
339     checkVendor "$BuildVendor"
340     checkOS "$BuildOS" ""
341
342     checkArch "$HostArch" "HaskellHostArch"
343     checkVendor "$HostVendor"
344     checkOS "$HostOS" ""
345
346     checkArch "$TargetArch" "HaskellTargetArch"
347     checkVendor "$TargetVendor"
348     checkOS "$TargetOS" "HaskellTargetOs"
349
350     AC_SUBST(HaskellTargetArch)
351     AC_SUBST(HaskellTargetOs)
352     AC_SUBST(HaskellHaveSubsectionsViaSymbols)
353     AC_SUBST(HaskellHaveIdentDirective)
354     AC_SUBST(HaskellHaveGnuNonexecStack)
355 ])
356
357
358 # GET_ARM_ISA
359 # ----------------------------------
360 # Get info about the ISA on the ARM arch
361 AC_DEFUN([GET_ARM_ISA],
362 [
363     AC_COMPILE_IFELSE([
364         AC_LANG_PROGRAM(
365             [],
366             [#if defined(__ARM_ARCH_2__)  || \
367                  defined(__ARM_ARCH_3__)  || \
368                  defined(__ARM_ARCH_3M__) || \
369                  defined(__ARM_ARCH_4__)  || \
370                  defined(__ARM_ARCH_4T__) || \
371                  defined(__ARM_ARCH_5__)  || \
372                  defined(__ARM_ARCH_5T__) || \
373                  defined(__ARM_ARCH_5E__) || \
374                  defined(__ARM_ARCH_5TE__)
375                  return 0;
376              #else
377                  not pre arm v6
378              #endif]
379         )],
380         [AC_DEFINE(arm_HOST_ARCH_PRE_ARMv6, 1, [ARM pre v6])
381          AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
382          changequote(, )dnl
383          ARM_ISA=ARMv5
384          ARM_ISA_EXT="[]"
385          changequote([, ])dnl
386         ],
387         [
388             AC_COMPILE_IFELSE([
389                 AC_LANG_PROGRAM(
390                     [],
391                     [#if defined(__ARM_ARCH_6__)   || \
392                          defined(__ARM_ARCH_6J__)  || \
393                          defined(__ARM_ARCH_6T2__) || \
394                          defined(__ARM_ARCH_6Z__)  || \
395                          defined(__ARM_ARCH_6ZK__) || \
396                          defined(__ARM_ARCH_6K__)  || \
397                          defined(__ARM_ARCH_6KZ__) || \
398                          defined(__ARM_ARCH_6M__)
399                          return 0;
400                      #else
401                          not pre arm v7
402                      #endif]
403                 )],
404                 [AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
405                  ARM_ISA=ARMv6
406                  AC_COMPILE_IFELSE([
407                         AC_LANG_PROGRAM(
408                                 [],
409                                 [#if defined(__VFP_FP__)
410                                      return 0;
411                                 #else
412                                      no vfp
413                                 #endif]
414                         )],
415                         [changequote(, )dnl
416                          ARM_ISA_EXT="[VFPv2]"
417                          changequote([, ])dnl
418                         ],
419                         [changequote(, )dnl
420                          ARM_ISA_EXT="[]"
421                          changequote([, ])dnl
422                         ]
423                 )],
424                 [changequote(, )dnl
425                  ARM_ISA=ARMv7
426                  ARM_ISA_EXT="[VFPv3,NEON]"
427                  changequote([, ])dnl
428                 ])
429         ])
430
431         AC_COMPILE_IFELSE(
432                [AC_LANG_PROGRAM(
433                        [],
434                        [#if defined(__SOFTFP__)
435                             return 0;
436                        #else
437                             not softfp
438                        #endif]
439                )],
440                [changequote(, )dnl
441                 ARM_ABI="SOFT"
442                 changequote([, ])dnl
443                ],
444                [AC_COMPILE_IFELSE(
445                     [AC_LANG_PROGRAM(
446                        [],
447                        [#if defined(__ARM_PCS_VFP)
448                             return 0;
449                        #else
450                             no hard float ABI
451                        #endif]
452                     )],
453                     [ARM_ABI="HARD"],
454                     [ARM_ABI="SOFTFP"]
455                )]
456         )
457
458         AC_SUBST(ARM_ISA)
459 ])
460
461
462 # FP_SETTINGS
463 # ----------------------------------
464 # Set the variables used in the settings file
465 AC_DEFUN([FP_SETTINGS],
466 [
467     if test "$windows" = YES -a "$EnableDistroToolchain" = "NO"
468     then
469         mingw_bin_prefix=mingw/bin/
470         SettingsCCompilerCommand="\$topdir/../${mingw_bin_prefix}gcc.exe"
471         SettingsHaskellCPPCommand="\$topdir/../${mingw_bin_prefix}gcc.exe"
472         SettingsHaskellCPPFlags="$HaskellCPPArgs"
473         SettingsLdCommand="\$topdir/../${mingw_bin_prefix}ld.exe"
474         SettingsArCommand="\$topdir/../${mingw_bin_prefix}ar.exe"
475         SettingsRanlibCommand="\$topdir/../${mingw_bin_prefix}ranlib.exe"
476         SettingsPerlCommand='$topdir/../perl/perl.exe'
477         SettingsDllWrapCommand="\$topdir/../${mingw_bin_prefix}dllwrap.exe"
478         SettingsWindresCommand="\$topdir/../${mingw_bin_prefix}windres.exe"
479         SettingsTouchCommand='$topdir/bin/touchy.exe'
480     elif test "$EnableDistroToolchain" = "YES"
481     then
482         SettingsCCompilerCommand="$(basename $CC)"
483         SettingsCCompilerFlags="$CONF_CC_OPTS_STAGE2"
484         SettingsHaskellCPPCommand="$(basename $HaskellCPPCmd)"
485         SettingsHaskellCPPFlags="$HaskellCPPArgs"
486         SettingsLdCommand="$(basename $LdCmd)"
487         SettingsArCommand="$(basename $ArCmd)"
488         SettingsPerlCommand="$(basename $PerlCmd)"
489         SettingsDllWrapCommand="$(basename $DllWrapCmd)"
490         SettingsWindresCommand="$(basename $WindresCmd)"
491         SettingsTouchCommand='$topdir/bin/touchy.exe'
492     else
493         SettingsCCompilerCommand="$CC"
494         SettingsHaskellCPPCommand="$HaskellCPPCmd"
495         SettingsHaskellCPPFlags="$HaskellCPPArgs"
496         SettingsLdCommand="$LdCmd"
497         SettingsArCommand="$ArCmd"
498         SettingsRanlibCommand="$RanlibCmd"
499         SettingsPerlCommand="$PerlCmd"
500         if test -z "$DllWrapCmd"
501         then
502             SettingsDllWrapCommand="/bin/false"
503         else
504             SettingsDllWrapCommand="$DllWrapCmd"
505         fi
506         if test -z "$WindresCmd"
507         then
508             SettingsWindresCommand="/bin/false"
509         else
510             SettingsWindresCommand="$WindresCmd"
511         fi
512        SettingsTouchCommand='touch'
513     fi
514     if test -z "$LibtoolCmd"
515     then
516       SettingsLibtoolCommand="libtool"
517     else
518       SettingsLibtoolCommand="$LibtoolCmd"
519     fi
520     if test -z "$ClangCmd"
521     then
522         SettingsClangCommand="clang"
523     else
524         SettingsClangCommand="$ClangCmd"
525     fi
526     if test -z "$LlcCmd"
527     then
528       SettingsLlcCommand="llc"
529     else
530       SettingsLlcCommand="$LlcCmd"
531     fi
532     if test -z "$OptCmd"
533     then
534       SettingsOptCommand="opt"
535     else
536       SettingsOptCommand="$OptCmd"
537     fi
538     SettingsCCompilerFlags="$CONF_CC_OPTS_STAGE2"
539     SettingsCCompilerLinkFlags="$CONF_GCC_LINKER_OPTS_STAGE2"
540     SettingsCCompilerSupportsNoPie="$CONF_GCC_SUPPORTS_NO_PIE"
541     SettingsLdFlags="$CONF_LD_LINKER_OPTS_STAGE2"
542     AC_SUBST(SettingsCCompilerCommand)
543     AC_SUBST(SettingsHaskellCPPCommand)
544     AC_SUBST(SettingsHaskellCPPFlags)
545     AC_SUBST(SettingsCCompilerFlags)
546     AC_SUBST(SettingsCCompilerLinkFlags)
547     AC_SUBST(SettingsCCompilerSupportsNoPie)
548     AC_SUBST(SettingsLdCommand)
549     AC_SUBST(SettingsLdFlags)
550     AC_SUBST(SettingsArCommand)
551     AC_SUBST(SettingsRanlibCommand)
552     AC_SUBST(SettingsPerlCommand)
553     AC_SUBST(SettingsDllWrapCommand)
554     AC_SUBST(SettingsWindresCommand)
555     AC_SUBST(SettingsLibtoolCommand)
556     AC_SUBST(SettingsTouchCommand)
557     AC_SUBST(SettingsClangCommand)
558     AC_SUBST(SettingsLlcCommand)
559     AC_SUBST(SettingsOptCommand)
560 ])
561
562 # Helper for cloning a shell variable's state
563 AC_DEFUN([FP_COPY_SHELLVAR],
564 [if test -n "${$1+set}"; then $2="$$1"; else unset $2; fi ])
565
566 # FP_SET_CFLAGS_C99
567 # ----------------------------------
568 # figure out which CFLAGS are needed to place the compiler into C99 mode
569 # $1 is name of CC variable (unmodified)
570 # $2 is name of CC flags variable (augmented if needed)
571 # $3 is name of CPP flags variable (augmented if needed)
572 AC_DEFUN([FP_SET_CFLAGS_C99],
573 [
574     dnl save current state of AC_PROG_CC_C99
575     FP_COPY_SHELLVAR([CC],[fp_save_CC])
576     FP_COPY_SHELLVAR([CFLAGS],[fp_save_CFLAGS])
577     FP_COPY_SHELLVAR([CPPFLAGS],[fp_save_CPPFLAGS])
578     FP_COPY_SHELLVAR([ac_cv_prog_cc_c99],[fp_save_cc_c99])
579     dnl set local state
580     CC="$$1"
581     CFLAGS="$$2"
582     CPPFLAGS="$$3"
583     unset ac_cv_prog_cc_c99
584     dnl perform detection
585     _AC_PROG_CC_C99
586     fp_cc_c99="$ac_cv_prog_cc_c99"
587     case "x$ac_cv_prog_cc_c99" in
588       x)   ;; # noop
589       xno) AC_MSG_ERROR([C99-compatible compiler needed]) ;;
590       *)   $2="$$2 $ac_cv_prog_cc_c99"
591            $3="$$3 $ac_cv_prog_cc_c99"
592            ;;
593     esac
594     dnl restore saved state
595     FP_COPY_SHELLVAR([fp_save_CC],[CC])
596     FP_COPY_SHELLVAR([fp_save_CFLAGS],[CFLAGS])
597     FP_COPY_SHELLVAR([fp_save_CPPFLAGS],[CPPFLAGS])
598     FP_COPY_SHELLVAR([fp_save_cc_c99],[ac_cv_prog_cc_c99])
599     dnl cleanup
600     unset fp_save_CC
601     unset fp_save_CFLAGS
602     unset fp_save_cc_c99
603 ])
604
605 # FPTOOLS_SET_C_LD_FLAGS
606 # ----------------------------------
607 # Set the C, LD and CPP flags for a given platform.
608 # $1 is the platform
609 # $2 is the name of the CC flags variable
610 # $3 is the name of the linker flags variable when linking with gcc
611 # $4 is the name of the linker flags variable when linking with ld
612 # $5 is the name of the CPP flags variable
613 AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
614 [
615     AC_MSG_CHECKING([Setting up $2, $3, $4 and $5])
616     case $$1 in
617     i386-*)
618         # Workaround for #7799
619         $2="$$2 -U__i686"
620         ;;
621     esac
622
623     case $$1 in
624     i386-unknown-mingw32)
625         $2="$$2 -march=i686"
626         ;;
627     i386-portbld-freebsd*)
628         $2="$$2 -march=i686"
629         ;;
630     x86_64-unknown-solaris2)
631         $2="$$2 -m64"
632         $3="$$3 -m64"
633         $4="$$4 -m64"
634         $5="$$5 -m64"
635         ;;
636     alpha-*)
637         # For now, to suppress the gcc warning "call-clobbered
638         # register used for global register variable", we simply
639         # disable all warnings altogether using the -w flag. Oh well.
640         $2="$$2 -w -mieee -D_REENTRANT"
641         $3="$$3 -w -mieee -D_REENTRANT"
642         $5="$$5 -w -mieee -D_REENTRANT"
643         ;;
644     hppa*)
645         # ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
646         # (very nice, but too bad the HP /usr/include files don't agree.)
647         $2="$$2 -D_HPUX_SOURCE"
648         $3="$$3 -D_HPUX_SOURCE"
649         $5="$$5 -D_HPUX_SOURCE"
650         ;;
651     arm*linux*)
652         # On arm/linux and arm/android, tell gcc to generate Arm
653         # instructions (ie not Thumb).
654         $2="$$2 -marm"
655         $3="$$3 -Wl,-z,noexecstack"
656         $4="$$4 -z noexecstack"
657         ;;
658
659     aarch64*linux*)
660         $3="$$3 -Wl,-z,noexecstack"
661         $4="$$4 -z noexecstack"
662         ;;
663
664     powerpc-ibm-aix*)
665         # We need `-D_THREAD_SAFE` to unlock the thread-local `errno`.
666         $2="$$2 -D_THREAD_SAFE"
667         $3="$$3 -D_THREAD_SAFE -Wl,-bnotextro"
668         $4="$$4 -bnotextro"
669         $5="$$5 -D_THREAD_SAFE"
670         ;;
671
672     x86_64-*-openbsd*)
673         # We need -z wxneeded at least to link ghc-stage2 to workaround
674         # W^X issue in GHCi on OpenBSD current (as of Aug 2016)
675         $3="$$3 -Wl,-z,wxneeded"
676         $4="$$4 -z wxneeded"
677         ;;
678
679     esac
680
681     # If gcc knows about the stack protector, turn it off.
682     # Otherwise the stack-smash handler gets triggered.
683     echo 'int main(void) {return 0;}' > conftest.c
684     if $CC -c conftest.c -fno-stack-protector > /dev/null 2>&1
685     then
686         $2="$$2 -fno-stack-protector"
687     fi
688
689     rm -f conftest.c conftest.o
690     AC_MSG_RESULT([done])
691 ])
692
693
694 # FP_VISIBILITY_HIDDEN
695 # ----------------------------------
696 # Is the visibility hidden attribute supported?
697 AC_DEFUN([FP_VISIBILITY_HIDDEN],
698 [
699     AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
700     echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
701     if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
702     then
703         AC_MSG_RESULT([yes])
704         AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
705     else
706         AC_MSG_RESULT([no])
707     fi
708     rm -f conftest.c conftest.o
709 ])
710
711
712 # FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
713 # ----------------------------------
714 # Little endian ARM on Linux with some ABIs has big endian word order
715 # in doubles. Define FLOAT_WORDS_BIGENDIAN if this is the case.
716 AC_DEFUN([FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN],
717   [AC_CACHE_CHECK([whether float word order is big endian], [fptools_cv_float_word_order_bigendian],
718     [AC_COMPILE_IFELSE(
719       [AC_LANG_PROGRAM(
720         [#include <endian.h>],
721         [#if defined(__FLOAT_WORD_ORDER) && __FLOAT_WORD_ORDER == BIG_ENDIAN
722              return 0;
723          #else
724              not float word order big endian
725          #endif]
726       )],
727       [fptools_cv_float_word_order_bigendian=yes],
728       [fptools_cv_float_word_order_bigendian=no])
729     ])
730   case $fptools_cv_float_word_order_bigendian in
731       yes)
732           AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
733           [Define to 1 if your processor stores words of floats with
734            the most significant byte first]) ;;
735   esac
736 ])
737
738
739 # FP_PROG_CONTEXT_DIFF
740 # --------------------
741 # Figure out how to do context diffs. Sets the output variable ContextDiffCmd.
742 #
743 # Note: NeXTStep thinks diff'ing a file against itself is "trouble".
744 AC_DEFUN([FP_PROG_CONTEXT_DIFF],
745 [AC_CACHE_CHECK([for a working context diff], [fp_cv_context_diff],
746 [echo foo > conftest1
747 echo foo > conftest2
748 fp_cv_context_diff=no
749 for fp_var in '-U 1' '-u1' '-C 1' '-c1'
750 do
751   if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
752     fp_cv_context_diff="diff $fp_var"
753     break
754   fi
755 done])
756 if test x"$fp_cv_context_diff" = xno; then
757    AC_MSG_ERROR([cannot figure out how to do context diffs])
758 fi
759 AC_SUBST(ContextDiffCmd, [$fp_cv_context_diff])
760 ])# FP_PROG_CONTEXT_DIFF
761
762
763 # FP_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS)
764 # --------------------------------------------------------
765 # Assign VARIABLE the value of the compile-time EXPRESSION using INCLUDES for
766 # compilation. Execute IF-FAILS when unable to determine the value. Works for
767 # cross-compilation, too.
768 #
769 # Implementation note: We are lazy and use an internal autoconf macro, but it
770 # is supported in autoconf versions 2.50 up to the actual 2.57, so there is
771 # little risk.
772 AC_DEFUN([FP_COMPUTE_INT],
773 [_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
774 ])# FP_COMPUTE_INT
775
776
777 # FP_CHECK_ALIGNMENT(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
778 # ------------------------------------------------------------------
779 # A variation of AC_CHECK_SIZEOF for computing the alignment restrictions of a
780 # given type. Defines ALIGNMENT_TYPE.
781 AC_DEFUN([FP_CHECK_ALIGNMENT],
782 [AS_LITERAL_IF(m4_translit([[$1]], [*], [p]), [],
783                [AC_FATAL([$0: requires literal arguments])])[]dnl
784 AC_CHECK_TYPE([$1], [], [], [$3])[]dnl
785 m4_pushdef([fp_Cache], [AS_TR_SH([fp_cv_alignment_$1])])[]dnl
786 AC_CACHE_CHECK([alignment of $1], [fp_Cache],
787 [if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
788   FP_COMPUTE_INT([offsetof(struct { char c; $1 ty; },ty)],
789                  [fp_Cache],
790                  [AC_INCLUDES_DEFAULT([$3])],
791                  [AC_MSG_ERROR([cannot compute alignment ($1)
792 See `config.log' for more details.], [77])])
793 else
794   fp_Cache=0
795 fi])[]dnl
796 AC_DEFINE_UNQUOTED(AS_TR_CPP(alignment_$1), $fp_Cache, [The alignment of a `$1'.])[]dnl
797 m4_popdef([fp_Cache])[]dnl
798 ])# FP_CHECK_ALIGNMENT
799
800
801
802 # FP_CHECK_SIZEOF_AND_ALIGNMENT(TYPE)
803 # ------------------------------------------------------------------
804 # Combines AC_CHECK_SIZEOF and FP_CHECK_ALIGNMENT.
805 AC_DEFUN([FP_CHECK_SIZEOF_AND_ALIGNMENT],
806 [AC_CHECK_SIZEOF([$1])
807 FP_CHECK_ALIGNMENT([$1])
808 ])# FP_CHECK_SIZEOF_AND_ALIGNMENT
809
810
811 # FP_LEADING_UNDERSCORE
812 # ---------------------
813 # Test for determining whether symbol names have a leading underscore. We assume
814 # that they _haven't_ if anything goes wrong. Sets the output variable
815 # LeadingUnderscore to YES or NO and defines LEADING_UNDERSCORE correspondingly.
816 #
817 # Some nlist implementations seem to try to be compatible by ignoring a leading
818 # underscore sometimes (eg. FreeBSD). We therefore have to work around this by
819 # checking for *no* leading underscore first. Sigh.  --SDM
820 #
821 # Similarly on OpenBSD, but this test doesn't help. -- dons
822 #
823 AC_DEFUN([FP_LEADING_UNDERSCORE],
824 [AC_CHECK_LIB([elf], [nlist], [LIBS="-lelf $LIBS"])
825 AC_CACHE_CHECK([leading underscore in symbol names], [fptools_cv_leading_underscore], [
826 # Hack!: nlist() under Digital UNIX insist on there being an _,
827 # but symbol table listings shows none. What is going on here?!?
828 case $TargetPlatform in
829     # Apples mach-o platforms use leading underscores
830     *-apple-*) fptools_cv_leading_underscore=yes;;
831     *linux-android*) fptools_cv_leading_underscore=no;;
832     *openbsd*) # x86 openbsd is ELF from 3.4 >, meaning no leading uscore
833       case $build in
834         i386-*2\.@<:@0-9@:>@ | i386-*3\.@<:@0-3@:>@ ) fptools_cv_leading_underscore=yes ;;
835         *) fptools_cv_leading_underscore=no ;;
836       esac ;;
837     i386-unknown-mingw32) fptools_cv_leading_underscore=yes;;
838     x86_64-unknown-mingw32) fptools_cv_leading_underscore=no;;
839     *) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
840 #include <nlist.h>
841 struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
842 struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
843 #endif
844
845 int main(argc, argv)
846 int argc;
847 char **argv;
848 {
849 #ifdef HAVE_NLIST_H
850     if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
851         exit(1);
852     if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
853         exit(0);
854 #endif
855     exit(1);
856 }]])],[fptools_cv_leading_underscore=yes],[fptools_cv_leading_underscore=no],[fptools_cv_leading_underscore=no])
857 ;;
858 esac]);
859 AC_SUBST([LeadingUnderscore], [`echo $fptools_cv_leading_underscore | sed 'y/yesno/YESNO/'`])
860 if test x"$fptools_cv_leading_underscore" = xyes; then
861    AC_DEFINE([LEADING_UNDERSCORE], [1], [Define to 1 if C symbols have a leading underscore added by the compiler.])
862 fi])# FP_LEADING_UNDERSCORE
863
864
865 # FP_COMPARE_VERSIONS(VERSION1, TEST, VERSION2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
866 # ----------------------------------------------------------------------------------
867 # Compare dotted version numbers VERSION1 and VERSION2 lexicographically according
868 # to TEST (one of -eq, -ne, -lt, -le, -gt, or -ge).
869 AC_DEFUN([FP_COMPARE_VERSIONS],
870 [fp_version1=$1; fp_version2=$3
871 fp_save_IFS=$IFS; IFS='.'
872 while test x"$fp_version1" != x || test x"$fp_version2" != x
873 do
874
875   set dummy $fp_version1; shift
876   fp_num1=""
877   test $[@%:@] = 0 || { fp_num1="[$]1"; shift; }
878   test x"$fp_num1" = x && fp_num1="0"
879   fp_version1="[$]*"
880
881   set dummy $fp_version2; shift
882   fp_num2=""
883   test $[@%:@] = 0 || { fp_num2="[$]1"; shift; }
884   test x"$fp_num2" = x && fp_num2="0"
885   fp_version2="[$]*"
886
887   test "$fp_num1" = "$fp_num2" || break;
888 done
889 IFS=$fp_save_IFS
890 AS_IF([test "$fp_num1" $2 "$fp_num2"], [$4], [$5])[]dnl
891 ])# FP_COMPARE_VERSIONS
892
893
894 dnl
895 dnl Check for Happy and version.
896 dnl If there's no installed Happy, we look
897 dnl for a happy source tree and point the build system at that instead.
898 dnl If you increase the minimum version requirement, please also update:
899 dnl https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Tools
900 dnl
901 AC_DEFUN([FPTOOLS_HAPPY],
902 [AC_PATH_PROG(HappyCmd,happy,)
903
904 AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
905 changequote(, )dnl
906 [if test x"$HappyCmd" != x; then
907    fptools_cv_happy_version=`"$HappyCmd" -v |
908               grep 'Happy Version' | sed -e 's/Happy Version \([^ ]*\).*/\1/g'` ;
909 else
910    fptools_cv_happy_version="";
911 fi;
912 changequote([, ])dnl
913 ])
914 if test ! -f compiler/parser/Parser.hs || test ! -f compiler/cmm/CmmParse.hs
915 then
916     FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.19.4],
917       [AC_MSG_ERROR([Happy version 1.19.4 or later is required to compile GHC.])])[]
918 fi
919 HappyVersion=$fptools_cv_happy_version;
920 AC_SUBST(HappyVersion)
921 ])
922
923 dnl
924 dnl Check for Alex and version.
925 dnl If you increase the minimum version requirement, please also update:
926 dnl https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Tools
927 dnl
928 AC_DEFUN([FPTOOLS_ALEX],
929 [
930 AC_PATH_PROG(AlexCmd,alex,)
931
932 AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
933 changequote(, )dnl
934 [if test x"$AlexCmd" != x; then
935    fptools_cv_alex_version=`"$AlexCmd" -v |
936               grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'` ;
937 else
938    fptools_cv_alex_version="";
939 fi;
940 changequote([, ])dnl
941 ])
942 FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-ge],[3.0],
943   [Alex3=YES],[Alex3=NO])
944 if test ! -f compiler/cmm/CmmLex.hs || test ! -f compiler/parser/Lexer.hs
945 then
946     FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.0],
947       [AC_MSG_ERROR([Alex version 3.1.0 or later is required to compile GHC.])])[]
948 fi
949 AlexVersion=$fptools_cv_alex_version;
950 AC_SUBST(AlexVersion)
951 AC_SUBST(Alex3)
952 ])
953
954
955 # FP_PROG_LD_FLAG
956 # ---------------
957 # Sets the output variable $2 to $1 if ld supports the $1 flag.
958 # Otherwise the variable's value is empty.
959 AC_DEFUN([FP_PROG_LD_FLAG],
960 [
961 AC_CACHE_CHECK([whether ld understands $1], [fp_cv_$2],
962 [echo 'int foo() { return 0; }' > conftest.c
963 ${CC-cc} -c conftest.c
964 if ${LdCmd} -r $1 -o conftest2.o conftest.o > /dev/null 2>&1; then
965    fp_cv_$2=$1
966 else
967    fp_cv_$2=
968 fi
969 rm -rf conftest*])
970 $2=$fp_cv_$2
971 ])# FP_PROG_LD_FLAG
972
973
974 # FP_PROG_LD_BUILD_ID
975 # ------------
976
977 # Sets the output variable LdHasBuildId to YES if ld supports
978 # --build-id, or NO otherwise.
979 AC_DEFUN([FP_PROG_LD_BUILD_ID],
980 [
981 AC_CACHE_CHECK([whether ld understands --build-id], [fp_cv_ld_build_id],
982 [echo 'int foo() { return 0; }' > conftest.c
983 ${CC-cc} -c conftest.c
984 if ${LdCmd} -r --build-id=none -o conftest2.o conftest.o > /dev/null 2>&1; then
985    fp_cv_ld_build_id=yes
986 else
987    fp_cv_ld_build_id=no
988 fi
989 rm -rf conftest*])
990 if test "$fp_cv_ld_build_id" = yes; then
991   LdHasBuildId=YES
992 else
993   LdHasBuildId=NO
994 fi
995 AC_SUBST([LdHasBuildId])
996 ])# FP_PROG_LD_BUILD_ID
997
998
999 # FP_PROG_LD_IS_GNU
1000 # -----------------
1001 # Sets the output variable LdIsGNULd to YES or NO, depending on whether it is
1002 # GNU ld or not.
1003 AC_DEFUN([FP_PROG_LD_IS_GNU],[
1004 AC_CACHE_CHECK([whether ld is GNU ld], [fp_cv_gnu_ld],
1005 [[if ${LdCmd} --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
1006   fp_cv_gnu_ld=YES
1007 else
1008   fp_cv_gnu_ld=NO
1009 fi]])
1010 AC_SUBST([LdIsGNULd],["$fp_cv_gnu_ld"])
1011 ])# FP_PROG_LD_IS_GNU
1012
1013
1014 # FP_PROG_LD_NO_COMPACT_UNWIND
1015 # ----------------------------
1016
1017 # Sets the output variable LdHasNoCompactUnwind to YES if ld supports
1018 # -no_compact_unwind, or NO otherwise.
1019 AC_DEFUN([FP_PROG_LD_NO_COMPACT_UNWIND],
1020 [
1021 AC_CACHE_CHECK([whether ld understands -no_compact_unwind], [fp_cv_ld_no_compact_unwind],
1022 [echo 'int foo() { return 0; }' > conftest.c
1023 ${CC-cc} -c conftest.c
1024 if ${LdCmd} -r -no_compact_unwind -o conftest2.o conftest.o > /dev/null 2>&1; then
1025    fp_cv_ld_no_compact_unwind=yes
1026 else
1027    fp_cv_ld_no_compact_unwind=no
1028 fi
1029 rm -rf conftest*])
1030 if test "$fp_cv_ld_no_compact_unwind" = yes; then
1031   LdHasNoCompactUnwind=YES
1032 else
1033   LdHasNoCompactUnwind=NO
1034 fi
1035 AC_SUBST([LdHasNoCompactUnwind])
1036 ])# FP_PROG_LD_NO_COMPACT_UNWIND
1037
1038
1039 # FP_PROG_LD_FILELIST
1040 # -------------------
1041
1042 # Sets the output variable LdHasFilelist to YES if ld supports
1043 # -filelist, or NO otherwise.
1044 AC_DEFUN([FP_PROG_LD_FILELIST],
1045 [
1046 AC_CACHE_CHECK([whether ld understands -filelist], [fp_cv_ld_has_filelist],
1047 [
1048     echo 'int foo() { return 0; }' > conftest1.c
1049     echo 'int bar() { return 0; }' > conftest2.c
1050     ${CC-cc} -c conftest1.c
1051     ${CC-cc} -c conftest2.c
1052     echo conftest1.o  > conftest.o-files
1053     echo conftest2.o >> conftest.o-files
1054     if ${LdCmd} -r -filelist conftest.o-files -o conftest.o > /dev/null 2>&1
1055     then
1056         fp_cv_ld_has_filelist=yes
1057     else
1058         fp_cv_ld_has_filelist=no
1059     fi
1060     rm -rf conftest*
1061 ])
1062 if test "$fp_cv_ld_has_filelist" = yes; then
1063     LdHasFilelist=YES
1064 else
1065     LdHasFilelist=NO
1066 fi
1067 AC_SUBST([LdHasFilelist])
1068 ])# FP_PROG_LD_FILELIST
1069
1070
1071 # FP_PROG_AR
1072 # ----------
1073 # Sets fp_prog_ar to a path to ar. Exits if no ar can be found
1074 # The host normalization on Windows breaks autoconf, it no longer
1075 # thinks that target == host so it never checks the unqualified
1076 # tools for Windows. See #14274.
1077 AC_DEFUN([FP_PROG_AR],
1078 [if test -z "$fp_prog_ar"; then
1079   if test "$HostOS" = "mingw32"
1080   then
1081     AC_PATH_PROG([fp_prog_ar], [ar])
1082     if test -n "$fp_prog_ar"; then
1083       fp_prog_ar=$(cygpath -m $fp_prog_ar)
1084     fi
1085   else
1086     AC_CHECK_TARGET_TOOL([fp_prog_ar], [ar])
1087   fi
1088 fi
1089 if test -z "$fp_prog_ar"; then
1090   AC_MSG_ERROR([cannot find ar in your PATH, no idea how to make a library])
1091 fi
1092 ])# FP_PROG_AR
1093
1094
1095 # FP_PROG_AR_IS_GNU
1096 # -----------------
1097 # Sets fp_prog_ar_is_gnu to yes or no, depending on whether it is GNU ar or not.
1098 AC_DEFUN([FP_PROG_AR_IS_GNU],
1099 [AC_REQUIRE([FP_PROG_AR])
1100 AC_CACHE_CHECK([whether $fp_prog_ar is GNU ar], [fp_cv_prog_ar_is_gnu],
1101 [if "$fp_prog_ar" --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
1102   fp_cv_prog_ar_is_gnu=yes
1103 else
1104   fp_cv_prog_ar_is_gnu=no
1105 fi])
1106 fp_prog_ar_is_gnu=$fp_cv_prog_ar_is_gnu
1107 AC_SUBST([ArIsGNUAr], [`echo $fp_prog_ar_is_gnu | tr 'a-z' 'A-Z'`])
1108 ])# FP_PROG_AR_IS_GNU
1109
1110
1111 # FP_PROG_AR_SUPPORTS_ATFILE
1112 # -----------------
1113 # Sets fp_prog_ar_supports_atfile to yes or no, depending on whether
1114 # or not it supports the @file syntax
1115 AC_DEFUN([FP_PROG_AR_SUPPORTS_ATFILE],
1116 [AC_REQUIRE([FP_PROG_AR])
1117  AC_REQUIRE([FP_PROG_AR_ARGS])
1118 AC_CACHE_CHECK([whether $fp_prog_ar supports @file], [fp_cv_prog_ar_supports_atfile],
1119 [
1120 rm -f conftest*
1121 touch conftest.file
1122 echo conftest.file  > conftest.atfile
1123 echo conftest.file >> conftest.atfile
1124 "$fp_prog_ar" $fp_prog_ar_args conftest.a @conftest.atfile > /dev/null 2>&1
1125 fp_prog_ar_supports_atfile_tmp=`"$fp_prog_ar" t conftest.a 2> /dev/null | grep -c conftest.file`
1126 rm -f conftest*
1127 if test "$fp_prog_ar_supports_atfile_tmp" -eq 2
1128 then
1129   fp_cv_prog_ar_supports_atfile=yes
1130 else
1131   fp_cv_prog_ar_supports_atfile=no
1132 fi])
1133 fp_prog_ar_supports_atfile=$fp_cv_prog_ar_supports_atfile
1134 AC_SUBST([ArSupportsAtFile], [`echo $fp_prog_ar_supports_atfile | tr 'a-z' 'A-Z'`])
1135 ])# FP_PROG_AR_SUPPORTS_ATFILE
1136
1137 # FP_PROG_AR_ARGS
1138 # ---------------
1139 # Sets fp_prog_ar_args to the arguments for ar and the output variable ArCmd
1140 # to an invocation of ar including these arguments.
1141 AC_DEFUN([FP_PROG_AR_ARGS],
1142 [AC_REQUIRE([FP_PROG_AR_IS_GNU])
1143 AC_CACHE_CHECK([for ar arguments], [fp_cv_prog_ar_args],
1144 [
1145 # GNU ar needs special treatment: it appears to have problems with
1146 # object files with the same name if you use the 's' modifier, but
1147 # simple 'ar q' works fine, and doesn't need a separate ranlib.
1148 if test $fp_prog_ar_is_gnu = yes; then
1149   fp_cv_prog_ar_args="q"
1150 else
1151   touch conftest.dummy
1152   for fp_var in clqsZ clqs cqs clq cq ; do
1153      rm -f conftest.a
1154      if "$fp_prog_ar" $fp_var conftest.a conftest.dummy > /dev/null 2> /dev/null; then
1155         fp_cv_prog_ar_args=$fp_var
1156         break
1157      fi
1158   done
1159   rm -f conftest*
1160   if test -z "$fp_cv_prog_ar_args"; then
1161     AC_MSG_ERROR([cannot figure out how to use your $fp_prog_ar])
1162   fi
1163 fi])
1164 fp_prog_ar_args=$fp_cv_prog_ar_args
1165 AC_SUBST([ArCmd], ["$fp_prog_ar"])
1166 AC_SUBST([ArArgs], ["$fp_prog_ar_args"])
1167
1168 ])# FP_PROG_AR_ARGS
1169
1170
1171 # FP_PROG_AR_NEEDS_RANLIB
1172 # -----------------------
1173 # Sets the output variable RANLIB_CMD to "ranlib" if it is needed and
1174 # found, to "true" otherwise. Sets REAL_RANLIB_CMD to the ranlib program,
1175 # even if we don't need ranlib (libffi might still need it).
1176 AC_DEFUN([FP_PROG_AR_NEEDS_RANLIB],[
1177     AC_REQUIRE([FP_PROG_AR_IS_GNU])
1178     AC_REQUIRE([FP_PROG_AR_ARGS])
1179     AC_REQUIRE([AC_PROG_CC])
1180
1181     AC_PROG_RANLIB
1182
1183     if test $fp_prog_ar_is_gnu = yes
1184     then
1185         fp_cv_prog_ar_needs_ranlib=no
1186     elif test "$TargetVendor_CPP" = "apple"
1187     then
1188         # It's quite tedious to check for Apple's crazy timestamps in
1189         # .a files, so we hardcode it.
1190         fp_cv_prog_ar_needs_ranlib=yes
1191     else
1192         case $fp_prog_ar_args in
1193         *s*)
1194             fp_cv_prog_ar_needs_ranlib=no;;
1195         *)
1196             fp_cv_prog_ar_needs_ranlib=yes;;
1197         esac
1198     fi
1199
1200     # workaround for AC_PROG_RANLIB which sets RANLIB to `:' when
1201     # ranlib is missing on the target OS. The problem is that
1202     # ghc-cabal cannot execute `:' which is a shell built-in but can
1203     # execute `true' which is usually simple program supported by the
1204     # OS.
1205     # Fixes #8795
1206     if test "$RANLIB" = ":"
1207     then
1208         RANLIB="true"
1209     fi
1210     REAL_RANLIB_CMD="$RANLIB"
1211     if test $fp_cv_prog_ar_needs_ranlib = yes
1212     then
1213         RANLIB_CMD="$RANLIB"
1214     else
1215         RANLIB_CMD="true"
1216     fi
1217     AC_SUBST([REAL_RANLIB_CMD])
1218     AC_SUBST([RANLIB_CMD])
1219 ])# FP_PROG_AR_NEEDS_RANLIB
1220
1221
1222 # FP_GCC_VERSION
1223 # -----------
1224 # Extra testing of the result AC_PROG_CC, testing the gcc version no. Sets the
1225 # output variable GccVersion.
1226 AC_DEFUN([FP_GCC_VERSION],
1227 [AC_REQUIRE([AC_PROG_CC])
1228 if test -z "$CC"
1229 then
1230   AC_MSG_ERROR([gcc is required])
1231 fi
1232 AC_CACHE_CHECK([version of gcc], [fp_cv_gcc_version],
1233 [
1234     # Be sure only to look at the first occurrence of the "version " string;
1235     # Some Apple compilers emit multiple messages containing this string.
1236     fp_cv_gcc_version="`$CC -v 2>&1 | sed -n -e '1,/version /s/.*version [[^0-9]]*\([[0-9.]]*\).*/\1/p'`"
1237     FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [4.7],
1238                         [AC_MSG_ERROR([Need at least gcc version 4.7])])
1239 ])
1240 AC_SUBST([GccVersion], [$fp_cv_gcc_version])
1241 ])# FP_GCC_VERSION
1242
1243 dnl Check to see if the C compiler is clang or llvm-gcc
1244 dnl
1245 GccIsClang=NO
1246 AC_DEFUN([FP_CC_LLVM_BACKEND],
1247 [AC_REQUIRE([AC_PROG_CC])
1248 AC_MSG_CHECKING([whether C compiler is clang])
1249 $CC -x c /dev/null -dM -E > conftest.txt 2>&1
1250 if grep "__clang__" conftest.txt >/dev/null 2>&1; then
1251   AC_SUBST([CC_CLANG_BACKEND], [1])
1252   AC_SUBST([CC_LLVM_BACKEND], [1])
1253   GccIsClang=YES
1254   AC_MSG_RESULT([yes])
1255 else
1256   AC_MSG_RESULT([no])
1257   AC_MSG_CHECKING([whether C compiler has an LLVM back end])
1258   if grep "__llvm__" conftest.txt >/dev/null 2>&1; then
1259     AC_SUBST([CC_CLANG_BACKEND], [0])
1260     AC_SUBST([CC_LLVM_BACKEND], [1])
1261     AC_MSG_RESULT([yes])
1262   else
1263     AC_SUBST([CC_CLANG_BACKEND], [0])
1264     AC_SUBST([CC_LLVM_BACKEND], [0])
1265     AC_MSG_RESULT([no])
1266   fi
1267 fi
1268 AC_SUBST(GccIsClang)
1269
1270 rm -f conftest.txt
1271 ])
1272
1273 # FP_GCC_SUPPORTS_NO_PIE
1274 # ----------------------
1275 # Does gcc support the -no-pie option? If so we should pass it to gcc when
1276 # joining objects since -pie may be enabled by default.
1277 AC_DEFUN([FP_GCC_SUPPORTS_NO_PIE],
1278 [
1279    AC_REQUIRE([AC_PROG_CC])
1280    AC_MSG_CHECKING([whether GCC supports -no-pie])
1281    echo 'int main() { return 0; }' > conftest.c
1282    # Some GCC versions only warn when passed an unrecognized flag.
1283    if $CC -no-pie -x c /dev/null -dM -E > conftest.txt 2>&1 && ! grep -i unrecognized conftest.txt > /dev/null 2>&1; then
1284        CONF_GCC_SUPPORTS_NO_PIE=YES
1285        AC_MSG_RESULT([yes])
1286    else
1287        CONF_GCC_SUPPORTS_NO_PIE=NO
1288        AC_MSG_RESULT([no])
1289    fi
1290    rm -f conftest.c conftest.o conftest
1291 ])
1292
1293 dnl Small feature test for perl version. Assumes PerlCmd
1294 dnl contains path to perl binary.
1295 dnl
1296 dnl (Perl versions prior to v5.6 does not contain the string "v5";
1297 dnl instead they display version strings such as "version 5.005".)
1298 dnl
1299 AC_DEFUN([FPTOOLS_CHECK_PERL_VERSION],
1300 [$PerlCmd -v >conftest.out 2>&1
1301    if grep "v5" conftest.out >/dev/null 2>&1; then
1302       :
1303    else
1304       AC_MSG_ERROR([your version of perl probably won't work, try upgrading it.])
1305    fi
1306 rm -fr conftest*
1307 ])
1308
1309
1310 # FP_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR,
1311 #               [VALUE-IF-NOT-FOUND], [PATH], [REJECT])
1312 # -----------------------------------------------------
1313 # HACK: A small wrapper around AC_CHECK_PROG, setting VARIABLE to the full path
1314 # of PROG-TO-CHECK-FOR when found.
1315 AC_DEFUN([FP_CHECK_PROG],
1316 [AC_CHECK_PROG([$1], [$2], [$as_dir/$ac_word$ac_exec_ext], [$3], [$4], [$5])][]dnl
1317 )# FP_CHECK_PROC
1318
1319
1320 # FP_PROG_FIND
1321 # ------------
1322 # Find a non-WinDoze version of the "find" utility.
1323 AC_DEFUN([FP_PROG_FIND],
1324 [AC_PATH_PROGS([fp_prog_find], [gfind find], find)
1325 echo foo > conftest.txt
1326 $fp_prog_find conftest.txt -print > conftest.out 2>&1
1327 if grep '^conftest.txt$' conftest.out > /dev/null 2>&1 ; then
1328   # OK, looks like a real "find".
1329   FindCmd="$fp_prog_find"
1330 else
1331   # Found a poor WinDoze version of "find", ignore it.
1332   AC_MSG_WARN([$fp_prog_find looks like a non-*nix find, ignoring it])
1333   FP_CHECK_PROG([FindCmd], [find], [], [], [$fp_prog_find])
1334 fi
1335 rm -f conftest.txt conftest.out
1336 AC_SUBST([FindCmd])[]dnl
1337 ])# FP_PROG_FIND
1338
1339
1340 # FP_PROG_SORT
1341 # ------------
1342 # Find a Unix-like sort
1343 AC_DEFUN([FP_PROG_SORT],
1344 [AC_PATH_PROG([fp_prog_sort], [sort])
1345 echo conwip > conftest.txt
1346 $fp_prog_sort -f conftest.txt > conftest.out 2>&1
1347 if grep 'conwip' conftest.out > /dev/null 2>&1 ; then
1348   # The goods
1349   SortCmd="$fp_prog_sort"
1350 else
1351   # Summink else..pick next one.
1352   AC_MSG_WARN([$fp_prog_sort looks like a non-*nix sort, ignoring it])
1353   FP_CHECK_PROG([SortCmd], [sort], [], [], [$fp_prog_sort])
1354 fi
1355 rm -f conftest.txt conftest.out
1356 AC_SUBST([SortCmd])[]dnl
1357 ])# FP_PROG_SORT
1358
1359
1360 dnl
1361 dnl FPTOOLS_NOCACHE_CHECK prints a message, then sets the
1362 dnl values of the second argument to the result of running
1363 dnl the commands given by the third. It does not cache its
1364 dnl result, so it is suitable for checks which should be
1365 dnl run every time.
1366 dnl
1367 AC_DEFUN([FPTOOLS_NOCACHE_CHECK],
1368 [AC_MSG_CHECKING([$1])
1369  $3
1370  AC_MSG_RESULT([$][$2])
1371 ])
1372
1373 dnl
1374 dnl FPTOOLS_GHC_VERSION(version)
1375 dnl FPTOOLS_GHC_VERSION(major, minor [, patchlevel])
1376 dnl FPTOOLS_GHC_VERSION(version, major, minor, patchlevel)
1377 dnl
1378 dnl Test for version of installed ghc.  Uses $GHC.
1379 dnl [original version pinched from c2hs]
1380 dnl
1381 AC_DEFUN([FPTOOLS_GHC_VERSION],
1382 [FPTOOLS_NOCACHE_CHECK([version of ghc], [fptools_version_of_ghc],
1383 ["${WithGhc-ghc}" --version > conftestghc 2>&1
1384   cat conftestghc >&AS_MESSAGE_LOG_FD
1385 #Useless Use Of cat award...
1386   fptools_version_of_ghc=`cat conftestghc | sed -n -e 's/, patchlevel *\([[0-9]]\)/.\1/;s/.* version \([[0-9]][[0-9.]]*\).*/\1/p'`
1387   rm -fr conftest*
1388   if test "[$]fptools_version_of_ghc" = ""
1389   then
1390     fptools_version_of_ghc='unknown'
1391   fi
1392 fptools_version_of_ghc[_major]=`echo [$]fptools_version_of_ghc | sed -e 's/^\([[0-9]]\).*/\1/'`
1393 fptools_version_of_ghc[_minor]=`echo [$]fptools_version_of_ghc | sed -e 's/^[[0-9]]\.\([[0-9]]*\).*/\1/'`
1394 fptools_version_of_ghc[_pl]=`echo [$]fptools_version_of_ghc | sed -n -e 's/^[[0-9]]\.[[0-9]]*\.\([[0-9]]*\)/\1/p'`
1395 #
1396 if test "[$]fptools_version_of_ghc[_pl]" = ""
1397 then
1398   fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor]"
1399   fptools_version_of_ghc[_pl]="0"
1400 else
1401   fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor].[$]fptools_version_of_ghc[_pl]"
1402 fi
1403 #
1404 ifelse($#, [1], [dnl
1405 [$1]="[$]fptools_version_of_ghc[_all]"
1406 ], $#, [2], [dnl
1407 [$1]="[$]fptools_version_of_ghc[_major]"
1408 [$2]="[$]fptools_version_of_ghc[_minor]"
1409 ], $#, [3], [dnl
1410 [$1]="[$]fptools_version_of_ghc[_major]"
1411 [$2]="[$]fptools_version_of_ghc[_minor]"
1412 [$3]="[$]fptools_version_of_ghc[_pl]"
1413 ], $#, [4], [dnl
1414 [$1]="[$]fptools_version_of_ghc[_all]"
1415 [$2]="[$]fptools_version_of_ghc[_major]"
1416 [$3]="[$]fptools_version_of_ghc[_minor]"
1417 [$4]="[$]fptools_version_of_ghc[_pl]"
1418 ])
1419 ])
1420 ])dnl
1421
1422
1423 # FP_CHECK_FUNC(FUNCTION, PROLOGUE, BODY, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
1424 # ---------------------------------------------------------------------------------
1425 # A variant of AC_CHECK_FUNCS, limited to a single FUNCTION, but with the
1426 # additional flexibility of specifying the PROLOGUE and BODY.
1427 AC_DEFUN([FP_CHECK_FUNC],
1428 [AS_VAR_PUSHDEF([fp_func], [fp_cv_func_$1])dnl
1429 AC_CACHE_CHECK([for $1], fp_func,
1430 [AC_LINK_IFELSE([AC_LANG_PROGRAM([$2], [$3])],
1431                 [AS_VAR_SET(fp_func, yes)],
1432                 [AS_VAR_SET(fp_func, no)])])
1433 AS_IF([test AS_VAR_GET(fp_func) = yes],
1434       [AC_DEFINE(AS_TR_CPP(HAVE_$1), [1],
1435                 [Define to 1 if you have the `]$1[' function.]) $4],
1436       [$5])dnl
1437 AS_VAR_POPDEF([fp_func])dnl
1438 ])# FP_CHECK_FUNC
1439
1440 # FP_PROG_GHC_PKG
1441 # ----------------
1442 # Try to find a ghc-pkg matching the ghc mentioned in the environment variable
1443 # WithGhc. Sets the output variable GhcPkgCmd.
1444 AC_DEFUN([FP_PROG_GHC_PKG],
1445 [AC_CACHE_CHECK([for ghc-pkg matching $WithGhc], fp_cv_matching_ghc_pkg,
1446 [
1447 # If we are told to use ghc-stage2, then we're using an in-tree
1448 # compiler. In this case, we just want ghc-pkg, not ghc-pkg-stage2,
1449 # so we sed off -stage[0-9]$. However, if we are told to use
1450 # ghc-6.12.1 then we want to use ghc-pkg-6.12.1, so we keep any
1451 # other suffix.
1452 fp_ghc_pkg_guess=`echo "$WithGhc" | sed -e 's/-stage@<:@0-9@:>@$//' -e 's,ghc\(@<:@^/\\@:>@*\)$,ghc-pkg\1,'`
1453 if "$fp_ghc_pkg_guess" list > /dev/null 2>&1; then
1454   fp_cv_matching_ghc_pkg=$fp_ghc_pkg_guess
1455 else
1456   AC_MSG_ERROR([Cannot find matching ghc-pkg])
1457 fi])
1458 GhcPkgCmd=$fp_cv_matching_ghc_pkg
1459 AC_SUBST([GhcPkgCmd])
1460 ])# FP_PROG_GHC_PKG
1461
1462
1463 # FP_GCC_EXTRA_FLAGS
1464 # ------------------
1465 # Determine which extra flags we need to pass gcc when we invoke it
1466 # to compile .hc code.
1467 #
1468 # -fwrapv is needed for gcc to emit well-behaved code in the presence of
1469 # integer wrap around. (Trac #952)
1470 #
1471 AC_DEFUN([FP_GCC_EXTRA_FLAGS],
1472 [AC_REQUIRE([FP_GCC_VERSION])
1473 AC_CACHE_CHECK([for extra options to pass gcc when compiling via C], [fp_cv_gcc_extra_opts],
1474 [fp_cv_gcc_extra_opts=
1475  FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.4],
1476   [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fwrapv"],
1477   [])
1478  FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [4.0],
1479   [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-builtin"],
1480   [])
1481 ])
1482 AC_SUBST([GccExtraViaCOpts],$fp_cv_gcc_extra_opts)
1483 ])
1484
1485
1486 # FP_SETUP_PROJECT_VERSION
1487 # ---------------------
1488 AC_DEFUN([FP_SETUP_PROJECT_VERSION],
1489 [
1490 if test "$RELEASE" = "NO"; then
1491     AC_MSG_CHECKING([for GHC version date])
1492     if test -f VERSION_DATE; then
1493         PACKAGE_VERSION=${PACKAGE_VERSION}.`cat VERSION_DATE`
1494         AC_MSG_RESULT(given $PACKAGE_VERSION)
1495     elif test -d .git; then
1496         changequote(, )dnl
1497         ver_posixtime=`git log -1 --pretty=format:%ct`
1498         ver_date=`perl -MPOSIX -e "print strftime('%Y%m%d', gmtime($ver_posixtime));"`
1499         if echo $ver_date | grep '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$' 2>&1 >/dev/null; then true; else
1500         changequote([, ])dnl
1501                 AC_MSG_ERROR([failed to detect version date: check that git and perl are in your path])
1502         fi
1503         PACKAGE_VERSION=${PACKAGE_VERSION}.$ver_date
1504         AC_MSG_RESULT(inferred $PACKAGE_VERSION)
1505     elif test -f VERSION; then
1506         PACKAGE_VERSION=`cat VERSION`
1507         AC_MSG_RESULT(given $PACKAGE_VERSION)
1508     else
1509         AC_MSG_WARN([cannot determine snapshot version: no .git directory and no VERSION file])
1510         dnl We'd really rather this case didn't happen, but it might
1511         dnl do (in particular, people using lndir trees may find that
1512         dnl the build system can't find any other date). If it does
1513         dnl happen, then we use the current date.
1514         dnl This way we get some idea about how recent a build is.
1515         dnl It also means that packages built for 2 different builds
1516         dnl will probably use different version numbers, so things are
1517         dnl less likely to go wrong.
1518         PACKAGE_VERSION=${PACKAGE_VERSION}.`date +%Y%m%d`
1519     fi
1520 fi
1521
1522     AC_MSG_CHECKING([for GHC Git commit id])
1523     if test -d .git; then
1524         git_commit_id=`git rev-parse HEAD`
1525         if test -n "$git_commit_id" 2>&1 >/dev/null; then true; else
1526             AC_MSG_ERROR([failed to detect revision: check that git is in your path])
1527         fi
1528         PACKAGE_GIT_COMMIT_ID=$git_commit_id
1529         AC_MSG_RESULT(inferred $PACKAGE_GIT_COMMIT_ID)
1530     elif test -f GIT_COMMIT_ID; then
1531         PACKAGE_GIT_COMMIT_ID=`cat GIT_COMMIT_ID`
1532         AC_MSG_RESULT(given $PACKAGE_GIT_COMMIT_ID)
1533     else
1534         AC_MSG_WARN([cannot determine snapshot revision: no .git directory and no 'GIT_COMMIT_ID' file])
1535         PACKAGE_GIT_COMMIT_ID="0000000000000000000000000000000000000000"
1536     fi
1537
1538
1539 # Some renamings
1540 AC_SUBST([ProjectName], [$PACKAGE_NAME])
1541 AC_SUBST([ProjectVersion], [$PACKAGE_VERSION])
1542 AC_SUBST([ProjectGitCommitId], [$PACKAGE_GIT_COMMIT_ID])
1543
1544 # Split PACKAGE_VERSION into (possibly empty) parts
1545 VERSION_MAJOR=`echo $PACKAGE_VERSION | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1'/`
1546 VERSION_TMP=`echo $PACKAGE_VERSION | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3'/`
1547 VERSION_MINOR=`echo $VERSION_TMP | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1'/`
1548 ProjectPatchLevel=`echo $VERSION_TMP | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3'/`
1549
1550 # Calculate project version as an integer, using 2 digits for minor version
1551 case $VERSION_MINOR in
1552   ?) ProjectVersionInt=${VERSION_MAJOR}0${VERSION_MINOR} ;;
1553   ??) ProjectVersionInt=${VERSION_MAJOR}${VERSION_MINOR} ;;
1554   *) AC_MSG_ERROR([bad minor version in $PACKAGE_VERSION]) ;;
1555 esac
1556 AC_SUBST([ProjectVersionInt])
1557
1558 # The project patchlevel is zero unless stated otherwise
1559 test -z "$ProjectPatchLevel" && ProjectPatchLevel=0
1560
1561 # Save split version of ProjectPatchLevel
1562 ProjectPatchLevel1=`echo $ProjectPatchLevel | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1/'`
1563 ProjectPatchLevel2=`echo $ProjectPatchLevel | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3/'`
1564
1565 AC_SUBST([ProjectPatchLevel1])
1566 AC_SUBST([ProjectPatchLevel2])
1567
1568 # Remove dots from the patch level; this allows us to have versions like 6.4.1.20050508
1569 ProjectPatchLevel=`echo $ProjectPatchLevel | sed 's/\.//'`
1570
1571 AC_SUBST([ProjectPatchLevel])
1572
1573 # The version of the GHC package changes every day, since the
1574 # patchlevel is the current date.  We don't want to force
1575 # recompilation of the entire compiler when this happens, so for
1576 # GHC HEAD we omit the patchlevel from the package version number.
1577 #
1578 # The ProjectPatchLevel1 > 20000000 iff GHC HEAD. If it's for a stable
1579 # release like 7.10.1 or for a release candidate such as 7.10.1.20141224
1580 # then we don't omit the patchlevel components.
1581
1582 ProjectVersionMunged="$ProjectVersion"
1583 if test "$ProjectPatchLevel1" -gt 20000000; then
1584   ProjectVersionMunged="${VERSION_MAJOR}.${VERSION_MINOR}"
1585 fi
1586 AC_SUBST([ProjectVersionMunged])
1587 ])# FP_SETUP_PROJECT_VERSION
1588
1589 # Check for a working timer_create().  We need a pretty detailed check
1590 # here, because there exist partially-working implementations of
1591 # timer_create() in certain versions of Linux (see bug #1933).
1592 #
1593 AC_DEFUN([FP_CHECK_TIMER_CREATE],[
1594 AC_CHECK_FUNC([timer_create],[HAVE_timer_create=yes],[HAVE_timer_create=no])
1595
1596 if test "$HAVE_timer_create" = "yes"
1597 then
1598   if test "$cross_compiling" = "yes"
1599   then
1600     # We can't test timer_create when we're cross-compiling, so we
1601     # optimistiaclly assume that it actually works properly.
1602     AC_DEFINE([USE_TIMER_CREATE], 1,  [Define to 1 if we can use timer_create(CLOCK_REALTIME,...)])
1603   else
1604   AC_CACHE_CHECK([for a working timer_create(CLOCK_REALTIME)],
1605     [fptools_cv_timer_create_works],
1606     [AC_TRY_RUN([
1607 #include <stdio.h>
1608 #ifdef HAVE_STDLIB_H
1609 #include <stdlib.h>
1610 #endif
1611 #ifdef HAVE_TIME_H
1612 #include <time.h>
1613 #endif
1614 #ifdef HAVE_SIGNAL_H
1615 #include <signal.h>
1616 #endif
1617 #ifdef HAVE_UNISTD_H
1618 #include <unistd.h>
1619 #endif
1620
1621 static volatile int tock = 0;
1622 static void handler(int i)
1623 {
1624    tock = 1;
1625 }
1626
1627 static void timeout(int i)
1628 {
1629   // timer_settime() has been known to hang, so just in case
1630   // we install a 1-second timeout (see #2257)
1631   exit(99);
1632 }
1633
1634 int main(int argc, char *argv[])
1635 {
1636
1637     struct sigevent ev;
1638     timer_t timer;
1639     struct itimerspec it;
1640     struct sigaction action;
1641     int m,n,count = 0;
1642
1643     ev.sigev_notify = SIGEV_SIGNAL;
1644     ev.sigev_signo  = SIGVTALRM;
1645
1646     action.sa_handler = handler;
1647     action.sa_flags = 0;
1648     sigemptyset(&action.sa_mask);
1649     if (sigaction(SIGVTALRM, &action, NULL) == -1) {
1650         fprintf(stderr,"SIGVTALRM problem\n");
1651         exit(3);
1652     }
1653
1654     action.sa_handler = timeout;
1655     action.sa_flags = 0;
1656     sigemptyset(&action.sa_mask);
1657     if (sigaction(SIGALRM, &action, NULL) == -1) {
1658       fprintf(stderr,"SIGALRM problem\n");
1659       exit(3);
1660     }
1661     alarm(1);
1662
1663     if (timer_create(CLOCK_REALTIME, &ev, &timer) != 0) {
1664         fprintf(stderr,"No CLOCK_REALTIME timer\n");
1665         exit(2);
1666     }
1667
1668     tock = 0;
1669
1670     it.it_value.tv_sec = 0;
1671     it.it_value.tv_nsec = 1000000; // 1ms
1672     it.it_interval = it.it_value;
1673     if (timer_settime(timer, 0, &it, NULL) != 0) {
1674         fprintf(stderr,"settime problem\n");
1675         exit(4);
1676     }
1677
1678     // some environments have coarse scheduler/timer granularity of ~10ms and worse
1679     usleep(100000); // 100ms
1680
1681     if (!tock) {
1682         fprintf(stderr,"no CLOCK_REALTIME signal\n");
1683         exit(5);
1684     }
1685
1686     timer_delete(timer);
1687
1688     exit(0);
1689 }
1690      ],
1691      [fptools_cv_timer_create_works=yes],
1692      [fptools_cv_timer_create_works=no])
1693   ])
1694 case $fptools_cv_timer_create_works in
1695     yes) AC_DEFINE([USE_TIMER_CREATE], 1,
1696                    [Define to 1 if we can use timer_create(CLOCK_REALTIME,...)]);;
1697 esac
1698   fi
1699 fi
1700 ])
1701
1702 # FP_ICONV
1703 # -------------
1704 AC_DEFUN([FP_ICONV],
1705 [
1706   dnl--------------------------------------------------------------------
1707   dnl * Deal with arguments telling us iconv is somewhere odd
1708   dnl--------------------------------------------------------------------
1709
1710   dnl Note: ICONV_LIB_DIRS and ICONV_INCLUDE_DIRS are not predefined
1711   dnl to the empty string to allow them to be overridden from the
1712   dnl environment.
1713
1714   AC_ARG_WITH([iconv-includes],
1715     [AC_HELP_STRING([--with-iconv-includes],
1716       [directory containing iconv.h])],
1717       [ICONV_INCLUDE_DIRS=$withval])
1718
1719   AC_ARG_WITH([iconv-libraries],
1720     [AC_HELP_STRING([--with-iconv-libraries],
1721       [directory containing iconv library])],
1722       [ICONV_LIB_DIRS=$withval])
1723
1724   AC_SUBST(ICONV_INCLUDE_DIRS)
1725   AC_SUBST(ICONV_LIB_DIRS)
1726 ])# FP_ICONV
1727
1728 # FP_GMP
1729 # -------------
1730 AC_DEFUN([FP_GMP],
1731 [
1732   dnl--------------------------------------------------------------------
1733   dnl * Deal with arguments telling us gmp is somewhere odd
1734   dnl--------------------------------------------------------------------
1735
1736   AC_ARG_WITH([gmp-includes],
1737     [AC_HELP_STRING([--with-gmp-includes],
1738       [directory containing gmp.h])],
1739       [GMP_INCLUDE_DIRS=$withval])
1740
1741   AC_ARG_WITH([gmp-libraries],
1742     [AC_HELP_STRING([--with-gmp-libraries],
1743       [directory containing gmp library])],
1744       [GMP_LIB_DIRS=$withval])
1745
1746   AC_SUBST(GMP_INCLUDE_DIRS)
1747   AC_SUBST(GMP_LIB_DIRS)
1748 ])# FP_GMP
1749
1750 # FP_CURSES
1751 # -------------
1752 AC_DEFUN([FP_CURSES],
1753 [
1754   dnl--------------------------------------------------------------------
1755   dnl * Deal with arguments telling us curses is somewhere odd
1756   dnl--------------------------------------------------------------------
1757
1758   AC_ARG_WITH([curses-libraries],
1759     [AC_HELP_STRING([--with-curses-libraries],
1760       [directory containing curses libraries])],
1761       [CURSES_LIB_DIRS=$withval])
1762
1763   AC_SUBST(CURSES_INCLUDE_DIRS)
1764   AC_SUBST(CURSES_LIB_DIRS)
1765 ])# FP_CURSES
1766
1767 # --------------------------------------------------------------
1768 # Calculate absolute path to build tree
1769 # --------------------------------------------------------------
1770
1771 AC_DEFUN([FP_FIND_ROOT],[
1772 AC_MSG_CHECKING(for path to top of build tree)
1773     if test "$windows" = YES
1774     then
1775       dnl Make sure this is a c:/foo/bar (mixed) style path. Some parts of
1776       dnl the build system might depend on it (such as the sed expression
1777       dnl `"s|$(TOP)/||i"` in addCFileDeps in rules/build-dependencies.mk).
1778       hardtop=$(cygpath -m "$(pwd)")
1779     else
1780       hardtop=$(pwd)
1781     fi
1782
1783     dnl Remove common automounter nonsense
1784     hardtop=`echo $hardtop | sed 's|^/tmp_mnt.*\(/local/.*\)$|\1|' | sed 's|^/tmp_mnt/|/|'`
1785
1786     if ! test -d "$hardtop"; then
1787         AC_MSG_ERROR([cannot determine current directory])
1788     fi
1789
1790     dnl We don't support building in directories with spaces.
1791     case "$hardtop" in
1792     *' '*)
1793         AC_MSG_ERROR([
1794         The build system does not support building in a directory
1795         containing space characters.
1796         Suggestion: move the build tree somewhere else.])
1797         ;;
1798     esac
1799
1800     AC_SUBST(hardtop)
1801
1802     AC_MSG_RESULT($hardtop)
1803 ])
1804
1805 # GHC_CONVERT_CPU(cpu, target_var)
1806 # --------------------------------
1807 # converts cpu from gnu to ghc naming, and assigns the result to $target_var
1808 AC_DEFUN([GHC_CONVERT_CPU],[
1809 case "$1" in
1810   aarch64*)
1811     $2="aarch64"
1812     ;;
1813   alpha*)
1814     $2="alpha"
1815     ;;
1816   arm*)
1817     $2="arm"
1818     ;;
1819   hppa1.1*)
1820     $2="hppa1_1"
1821     ;;
1822   hppa*)
1823     $2="hppa"
1824     ;;
1825   i386|i486|i586|i686)
1826     $2="i386"
1827     ;;
1828   ia64)
1829     $2="ia64"
1830     ;;
1831   m68k*)
1832     $2="m68k"
1833     ;;
1834   mipseb*)
1835     $2="mipseb"
1836     ;;
1837   mipsel*)
1838     $2="mipsel"
1839     ;;
1840   mips*)
1841     $2="mips"
1842     ;;
1843   powerpc64le*)
1844     $2="powerpc64le"
1845     ;;
1846   powerpc64*)
1847     $2="powerpc64"
1848     ;;
1849   powerpc*)
1850     $2="powerpc"
1851     ;;
1852   rs6000)
1853     $2="rs6000"
1854     ;;
1855   s390x*)
1856     $2="s390x"
1857     ;;
1858   s390*)
1859     $2="s390"
1860     ;;
1861   sh4)
1862     $2="sh4"
1863     ;;
1864   sparc64*)
1865     $2="sparc64"
1866     ;;
1867   sparc*)
1868     $2="sparc"
1869     ;;
1870   vax)
1871     $2="vax"
1872     ;;
1873   x86_64|amd64)
1874     $2="x86_64"
1875     ;;
1876   *)
1877     echo "Unknown CPU $1"
1878     exit 1
1879     ;;
1880   esac
1881 ])
1882
1883 # GHC_LLVM_TARGET(target_cpu, target_vendor, target_os, llvm_target_var)
1884 # --------------------------------
1885 # converts the canonicalized target into someting llvm can understand
1886 AC_DEFUN([GHC_LLVM_TARGET], [
1887   case "$2-$3" in
1888     hardfloat-*eabi)
1889       llvm_target_vendor="unknown"
1890       llvm_target_os="$3""hf"
1891       ;;
1892     *-mingw32|*-mingw64|*-msys)
1893       llvm_target_vendor="unknown"
1894       llvm_target_os="windows"
1895       ;;
1896     # retain any android and gnueabi linux flavours
1897     # for the LLVM Target. Otherwise these would be
1898     # turned into just `-linux` and fail to be found
1899     # in the `llvm-targets` file.
1900     *-android*|*-gnueabi*)
1901       GHC_CONVERT_VENDOR([$2],[llvm_target_vendor])
1902       llvm_target_os="$3"
1903       ;;
1904     *)
1905       GHC_CONVERT_VENDOR([$2],[llvm_target_vendor])
1906       GHC_CONVERT_OS([$3],[$1],[llvm_target_os])
1907       ;;
1908   esac
1909   $4="$1-$llvm_target_vendor-$llvm_target_os"
1910 ])
1911
1912
1913 # GHC_CONVERT_VENDOR(vendor, target_var)
1914 # --------------------------------
1915 # converts vendor from gnu to ghc naming, and assigns the result to $target_var
1916 AC_DEFUN([GHC_CONVERT_VENDOR],[
1917   case "$1" in
1918   pc|gentoo|w64) # like i686-pc-linux-gnu, i686-gentoo-freebsd8, x86_64-w64-mingw32
1919     $2="unknown"
1920     ;;
1921   softfloat) # like armv5tel-softfloat-linux-gnueabi
1922     $2="unknown"
1923     ;;
1924   hardfloat) # like armv7a-hardfloat-linux-gnueabi
1925     $2="unknown"
1926     ;;
1927   *)
1928     #pass thru by default
1929     $2="$1"
1930     ;;
1931   esac
1932 ])
1933
1934 # GHC_CONVERT_OS(os, converted_cpu, target_var)
1935 # --------------------------------
1936 # converts os from gnu to ghc naming, and assigns the result to $target_var
1937 AC_DEFUN([GHC_CONVERT_OS],[
1938     case "$1" in
1939       # watchos and tvos are ios variants as of May 2017.
1940       ios|watchos|tvos)
1941         $3="ios"
1942         ;;
1943       linux-android*)
1944         $3="linux-android"
1945         ;;
1946       linux-*|linux)
1947         $3="linux"
1948         ;;
1949       # As far as I'm aware, none of these have relevant variants
1950       freebsd|netbsd|openbsd|dragonfly|hpux|linuxaout|kfreebsdgnu|freebsd2|solaris2|mingw32|darwin|gnu|nextstep2|nextstep3|sunos4|ultrix|haiku)
1951         $3="$1"
1952         ;;
1953       aix*) # e.g. powerpc-ibm-aix7.1.3.0
1954         $3="aix"
1955         ;;
1956       darwin*) # e.g. aarch64-apple-darwin14
1957         $3="darwin"
1958         ;;
1959       freebsd*) # like i686-gentoo-freebsd7
1960                 #      i686-gentoo-freebsd8
1961                 #      i686-gentoo-freebsd8.2
1962         $3="freebsd"
1963         ;;
1964       nto-qnx*)
1965         $3="nto-qnx"
1966         ;;
1967       *)
1968         echo "Unknown OS $1"
1969         exit 1
1970         ;;
1971       esac
1972 ])
1973
1974 # BOOTSTRAPPING_GHC_INFO_FIELD
1975 # --------------------------------
1976 # Set the variable $1 to the value of the ghc --info field $2.
1977 AC_DEFUN([BOOTSTRAPPING_GHC_INFO_FIELD],[
1978 $1=`"$WithGhc" --info | grep "^ ,(\"$2\"," | sed -e 's/.*","//' -e 's/")$//'`
1979 tmp=${$1#\$topdir/}
1980 if test "${$1}" != "$tmp"
1981 then
1982     topdir=`"$WithGhc" --print-libdir | sed 's#\\\\#/#g'`
1983     $1="$topdir/$tmp"
1984 fi
1985 AC_SUBST($1)
1986 ])
1987
1988 # LIBRARY_VERSION(lib, [dir])
1989 # --------------------------------
1990 # Gets the version number of a library.
1991 # If $1 is ghc-prim, then we define LIBRARY_ghc_prim_VERSION as 1.2.3
1992 # $2 points to the directory under libraries/
1993 AC_DEFUN([LIBRARY_VERSION],[
1994 dir=m4_default([$2],[$1])
1995 LIBRARY_[]translit([$1], [-], [_])[]_VERSION=`grep -i "^version:" libraries/${dir}/$1.cabal | sed "s/.* //"`
1996 AC_SUBST(LIBRARY_[]translit([$1], [-], [_])[]_VERSION)
1997 ])
1998
1999 # XCODE_VERSION()
2000 # --------------------------------
2001 # Gets the version number of XCode, if on a Mac
2002 AC_DEFUN([XCODE_VERSION],[
2003     if test "$TargetVendor_CPP" = "apple"
2004     then
2005         AC_MSG_CHECKING(XCode version)
2006         XCodeVersion=`xcodebuild -version | grep Xcode | sed "s/Xcode //"`
2007         # Old XCode versions don't actually give the XCode version
2008         if test "$XCodeVersion" = ""
2009         then
2010             AC_MSG_RESULT(not found (too old?))
2011             XCodeVersion1=0
2012             XCodeVersion2=0
2013         else
2014             AC_MSG_RESULT($XCodeVersion)
2015             XCodeVersion1=`echo "$XCodeVersion" | sed 's/\..*//'`
2016             changequote(, )dnl
2017             XCodeVersion2=`echo "$XCodeVersion" | sed 's/[^.]*\.\([^.]*\).*/\1/'`
2018             changequote([, ])dnl
2019             AC_MSG_NOTICE(XCode version component 1: $XCodeVersion1)
2020             AC_MSG_NOTICE(XCode version component 2: $XCodeVersion2)
2021         fi
2022     fi
2023 ])
2024
2025 # FIND_LLVM_PROG()
2026 # --------------------------------
2027 # Find where the llvm tools are. We have a special function to handle when they
2028 # are installed with a version suffix (e.g., llc-3.1).
2029 #
2030 # $1 = the variable to set
2031 # $2 = the command to look for
2032 # $3 = the version of the command to look for
2033 #
2034 AC_DEFUN([FIND_LLVM_PROG],[
2035     # Test for program with and without version name.
2036     AC_CHECK_TOOLS([$1], [$2-$3 $2], [:])
2037     if test "$$1" != ":"; then
2038         AC_MSG_CHECKING([$$1 is version $3])
2039         if test `$$1 --version | grep -c "version $3"` -gt 0 ; then
2040             AC_MSG_RESULT(yes)
2041         else
2042             AC_MSG_RESULT(no)
2043             $1=""
2044         fi
2045     else
2046         $1=""
2047     fi
2048 ])
2049
2050 # CHECK_LD_COPY_BUG()
2051 # -------------------
2052 # Check for binutils bug #16177 present in some versions of the bfd ld
2053 # implementation affecting ARM relocations.
2054 # https://sourceware.org/bugzilla/show_bug.cgi?id=16177
2055 #
2056 # $1 = the platform
2057 #
2058 AC_DEFUN([CHECK_LD_COPY_BUG],[
2059     case $1 in
2060       arm*linux*)
2061         AC_CHECK_TARGET_TOOL([READELF], [readelf])
2062         AC_CHECK_TARGET_TOOL([AS], [as])
2063         AC_MSG_CHECKING([for ld bug 16177])
2064         cat >actest.s <<-EOF
2065           .globl _start
2066           .p2align 4
2067         _start:
2068           bkpt
2069
2070         .data
2071           .globl data_object
2072         object_reference:
2073           .long data_object
2074           .size object_reference, 4
2075 EOF
2076
2077         cat >aclib.s <<-EOF
2078           .data
2079           .globl data_object
2080           .type data_object, %object
2081           .size data_object, 4
2082         data_object:
2083             .long 123
2084 EOF
2085
2086         $AS -o aclib.o aclib.s
2087         $LD -shared -o aclib.so aclib.o
2088
2089         $AS -o actest.o actest.s
2090         $LD -o actest actest.o aclib.so
2091
2092         if $READELF -r actest | grep R_ARM_COPY > /dev/null; then
2093             AC_MSG_RESULT([affected])
2094             AC_MSG_ERROR(
2095               [Your linker is affected by binutils #16177, which
2096                critically breaks linkage of GHC objects. Please either upgrade
2097                binutils or supply a different linker with the LD environment
2098                variable.])
2099         else
2100             AC_MSG_RESULT([unaffected])
2101         fi
2102
2103         rm -f aclib.s aclib.o aclib.so actest.s actest.o actest
2104         ;;
2105       *)
2106         ;;
2107     esac
2108 ])
2109
2110 # FIND_GHC_BOOTSTRAP_PROG()
2111 # --------------------------------
2112 # Parse the bootstrap GHC's compier settings file for the location of things
2113 # like the `llc` and `opt` commands.
2114 #
2115 # $1 = the variable to set
2116 # $2 = The bootstrap compiler.
2117 # $3 = The string to grep for to find the correct line.
2118 #
2119 AC_DEFUN([FIND_GHC_BOOTSTRAP_PROG],[
2120     BootstrapTmpCmd=`grep $3 $($2 --print-libdir)/settings 2>/dev/null | sed 's/.*", "//;s/".*//'`
2121     if test -n "$BootstrapTmpCmd" && test `basename $BootstrapTmpCmd` = $BootstrapTmpCmd ; then
2122         AC_PATH_PROG([$1], [$BootstrapTmpCmd], "")
2123     else
2124         $1=$BootstrapTmpCmd
2125     fi
2126 ])
2127
2128
2129 AC_DEFUN([MAYBE_OVERRIDE_STAGE0],[
2130   if test ! -z "$With_$1" -a "$CrossCompiling" != "YES"; then
2131       AC_MSG_NOTICE([Not cross-compiling, so --with-$1 also sets $2])
2132       $2=$With_$1
2133   fi
2134 ])
2135
2136
2137 # FP_CPP_CMD_WITH_ARGS()
2138 # ----------------------
2139 # sets CPP command and its arguments
2140 #
2141 # $1 = the variable to set to CPP command
2142 # $2 = the variable to set to CPP command arguments
2143
2144 AC_DEFUN([FP_CPP_CMD_WITH_ARGS],[
2145 dnl ** what cpp to use?
2146 dnl --------------------------------------------------------------
2147 AC_ARG_WITH(hs-cpp,
2148 [AC_HELP_STRING([--with-hs-cpp=ARG],
2149       [Path to the (C) preprocessor for Haskell files [default=autodetect]])],
2150 [
2151     if test "$HostOS" = "mingw32"
2152     then
2153         AC_MSG_WARN([Request to use $withval will be ignored])
2154     else
2155         HS_CPP_CMD=$withval
2156     fi
2157 ],
2158 [
2159
2160     # We can't use $CPP here, since HS_CPP_CMD is expected to be a single
2161     # command (no flags), and AC_PROG_CPP defines CPP as "/usr/bin/gcc -E".
2162     HS_CPP_CMD=$CC
2163
2164     SOLARIS_GCC_CPP_BROKEN=NO
2165     SOLARIS_FOUND_GOOD_CPP=NO
2166     case $host in
2167         i386-*-solaris2)
2168         GCC_MAJOR_MINOR=`$CC --version|grep "gcc (GCC)"|cut -d ' ' -f 3-3|cut -d '.' -f 1-2`
2169         if test "$GCC_MAJOR_MINOR" != "3.4"; then
2170           # this is not 3.4.x release so with broken CPP
2171           SOLARIS_GCC_CPP_BROKEN=YES
2172         fi
2173         ;;
2174     esac
2175
2176     if test "$SOLARIS_GCC_CPP_BROKEN" = "YES"; then
2177       # let's try to find if GNU C 3.4.x is installed
2178       if test -x /usr/sfw/bin/gcc; then
2179         # something executable is in expected path so let's
2180         # see if it's really GNU C
2181         NEW_GCC_MAJOR_MINOR=`/usr/sfw/bin/gcc --version|grep "gcc (GCC)"|cut -d ' ' -f 3-3|cut -d '.' -f 1-2`
2182         if test "$NEW_GCC_MAJOR_MINOR" = "3.4"; then
2183           # this is GNU C 3.4.x which provides non-broken CPP on Solaris
2184           # let's use it as CPP then.
2185           HS_CPP_CMD=/usr/sfw/bin/gcc
2186           SOLARIS_FOUND_GOOD_CPP=YES
2187         fi
2188       fi
2189       if test "$SOLARIS_FOUND_GOOD_CPP" = "NO"; then
2190         AC_MSG_WARN([Your GNU C provides broken CPP and you do not have GNU C 3.4.x installed.])
2191         AC_MSG_WARN([Please install GNU C 3.4.x to solve this issue. It will be used as CPP only.])
2192       fi
2193     fi
2194 ]
2195 )
2196
2197
2198
2199 dnl ** what cpp flags to use?
2200 dnl -----------------------------------------------------------
2201 AC_ARG_WITH(hs-cpp-flags,
2202   [AC_HELP_STRING([--with-hs-cpp-flags=ARG],
2203       [Flags to the (C) preprocessor for Haskell files [default=autodetect]])],
2204   [
2205       if test "$HostOS" = "mingw32"
2206       then
2207           AC_MSG_WARN([Request to use $withval will be ignored])
2208       else
2209           HS_CPP_ARGS=$withval
2210       fi
2211   ],
2212 [
2213   $HS_CPP_CMD -x c /dev/null -dM -E > conftest.txt 2>&1
2214   if grep "__clang__" conftest.txt >/dev/null 2>&1; then
2215     HS_CPP_ARGS="-E -undef -traditional -Wno-invalid-pp-token -Wno-unicode -Wno-trigraphs"
2216   else
2217       $HS_CPP_CMD  -v > conftest.txt 2>&1
2218       if  grep "gcc" conftest.txt >/dev/null 2>&1; then
2219           HS_CPP_ARGS="-E -undef -traditional"
2220         else
2221           $HS_CPP_CMD  --version > conftest.txt 2>&1
2222           if grep "cpphs" conftest.txt >/dev/null 2>&1; then
2223             HS_CPP_ARGS="--cpp -traditional"
2224           else
2225             AC_MSG_WARN([configure can't recognize your CPP program, you may need to set --with-hs-cpp-flags=FLAGS explicitly])
2226             HS_CPP_ARGS=""
2227           fi
2228       fi
2229   fi
2230   ]
2231 )
2232
2233 $1=$HS_CPP_CMD
2234 $2=$HS_CPP_ARGS
2235
2236 ])
2237
2238 # FP_BFD_SUPPORT()
2239 # ----------------------
2240 # whether to use libbfd for debugging RTS
2241 AC_DEFUN([FP_BFD_SUPPORT], [
2242     AC_ARG_ENABLE(bfd-debug,
2243         [AC_HELP_STRING([--enable-bfd-debug],
2244               [Enable symbol resolution for -debug rts ('+RTS -Di') via binutils' libbfd [default=no]])],
2245         [
2246             # don't pollute general LIBS environment
2247             save_LIBS="$LIBS"
2248             AC_CHECK_HEADERS([bfd.h])
2249             dnl ** check whether this machine has BFD and libiberty installed (used for debugging)
2250             dnl    the order of these tests matters: bfd needs libiberty
2251             AC_CHECK_LIB(iberty, xmalloc)
2252             dnl 'bfd_init' is a rare non-macro in libbfd
2253             AC_CHECK_LIB(bfd,    bfd_init)
2254
2255             AC_TRY_LINK([#include <bfd.h>],
2256                         [
2257                                 /* mimic our rts/Printer.c */
2258                                 bfd* abfd;
2259                                 const char * name;
2260                                 char **matching;
2261
2262                                 name = "some.executable";
2263                                 bfd_init();
2264                                 abfd = bfd_openr(name, "default");
2265                                 bfd_check_format_matches (abfd, bfd_object, &matching);
2266                                 {
2267                                     long storage_needed;
2268                                     storage_needed = bfd_get_symtab_upper_bound (abfd);
2269                                 }
2270                                 {
2271                                     asymbol **symbol_table;
2272                                     long number_of_symbols;
2273                                     symbol_info info;
2274
2275                                     number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
2276                                     bfd_get_symbol_info(abfd,symbol_table[0],&info);
2277                                 }
2278                         ],
2279                         [],dnl bfd seems to work
2280                         [AC_MSG_ERROR([can't use 'bfd' library])])
2281             LIBS="$save_LIBS"
2282         ]
2283     )
2284 ])
2285
2286
2287 # FP_CC_LINKER_FLAG_TRY()
2288 # --------------------
2289 # Try a particular linker to see whether we can use it. In particular, determine
2290 # whether we can convince gcc to use it via a -fuse-ld=... flag.
2291 #
2292 # $1 = the name of the linker to try
2293 # $2 = the variable to set with the appropriate GHC flag if the linker is
2294 # found to be usable
2295 AC_DEFUN([FP_CC_LINKER_FLAG_TRY], [
2296     AC_MSG_CHECKING([whether C compiler supports -fuse-ld=$1])
2297     echo 'int main(void) {return 0;}' > conftest.c
2298     if $CC -o conftest.o -fuse-ld=$1 conftest.c > /dev/null 2>&1
2299     then
2300         $2="-fuse-ld=$1"
2301         AC_MSG_RESULT([yes])
2302     else
2303         AC_MSG_RESULT([no])
2304     fi
2305     rm -f conftest.c conftest.o
2306 ])
2307
2308 # FIND_LD
2309 # ---------
2310 # Find the version of `ld` to use and figure out how to get gcc to use it for
2311 # linking (if --enable-ld-override is enabled). This is used in both in the top
2312 # level configure.ac and in distrib/configure.ac.in.
2313 #
2314 # $1 = the platform
2315 # $2 = the variable to set with GHC options to configure gcc to use the chosen linker
2316 #
2317 AC_DEFUN([FIND_LD],[
2318     AC_ARG_ENABLE(ld-override,
2319       [AC_HELP_STRING([--disable-ld-override],
2320         [Prevent GHC from overriding the default linker used by gcc. If ld-override is enabled GHC will try to tell gcc to use whichever linker is selected by the LD environment variable. [default=override enabled]])],
2321       [],
2322       [enable_ld_override=yes])
2323
2324     find_ld() {
2325         # Make sure the user didn't specify LD manually.
2326         if test "z$LD" != "z"; then
2327             AC_CHECK_TARGET_TOOL([LD], [ld])
2328             return
2329         fi
2330
2331         # Manually iterate over possible names since we want to ensure that, e.g.,
2332         # if ld.lld is installed but gcc doesn't support -fuse-ld=lld, that we
2333         # then still try ld.gold and -fuse-ld=gold.
2334         for possible_ld in ld.lld ld.gold ld; do
2335             TmpLd="" # In case the user set LD
2336             AC_CHECK_TARGET_TOOL([TmpLd], [$possible_ld])
2337             if test "x$TmpLd" = "x"; then continue; fi
2338
2339             out=`$TmpLd --version`
2340             case $out in
2341               "GNU ld"*)   FP_CC_LINKER_FLAG_TRY(bfd, $2) ;;
2342               "GNU gold"*) FP_CC_LINKER_FLAG_TRY(gold, $2) ;;
2343               "LLD"*)      FP_CC_LINKER_FLAG_TRY(lld, $2) ;;
2344               *) AC_MSG_NOTICE([unknown linker version $out]) ;;
2345             esac
2346             if test "z$$2" = "z"; then
2347                 AC_MSG_NOTICE([unable to convince '$CC' to use linker '$TmpLd'])
2348                 # a terrible hack to prevent autoconf from caching the previous
2349                 # AC_CHECK_TARGET_TOOL result since next time we'll be looking
2350                 # for another ld variant.
2351                 $as_unset ac_cv_prog_ac_ct_TmpLd
2352             else
2353                 LD="$TmpLd"
2354                 return
2355             fi
2356         done
2357
2358         # Fallback
2359         AC_CHECK_TARGET_TOOL([LD], [ld])
2360     }
2361
2362     if test "x$enable_ld_override" = "xyes"; then
2363         find_ld
2364     else
2365         AC_CHECK_TARGET_TOOL([LD], [ld])
2366     fi
2367
2368     CHECK_LD_COPY_BUG([$1])
2369 ])
2370
2371 # LocalWords:  fi