Simplify the build system, and remove 2 phases
[ghc.git] / rules / build-dependencies.mk
1 # -----------------------------------------------------------------------------
2 #
3 # (c) 2009 The University of Glasgow
4 #
5 # This file is part of the GHC build system.
6 #
7 # To understand how the build system works and how to modify it, see
8 # http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
9 # http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
10 #
11 # -----------------------------------------------------------------------------
12
13 define build-dependencies
14 $(call trace, build-dependencies($1,$2,$3))
15 # $1 = dir
16 # $2 = distdir
17 # $3 = GHC stage to use (0 == bootstrapping compiler)
18
19 $1_$2_depfile_haskell = $$($1_$2_depfile_base).haskell
20 $1_$2_depfile_c_asm = $$($1_$2_depfile_base).c_asm
21
22 $1_$2_C_FILES_DEPS = $$(filter-out $$($1_$2_C_FILES_NODEPS),$$($1_$2_C_FILES))
23
24 $1_$2_MKDEPENDHS_FLAGS = -dep-makefile $$($1_$2_depfile_haskell).tmp $$(foreach way,$$(filter-out v,$$($1_$2_WAYS)),-dep-suffix $$(way))
25 $1_$2_MKDEPENDHS_FLAGS += -include-pkg-deps
26
27 ifneq "$$($1_$2_NO_BUILD_DEPS)" "YES"
28
29 $$($1_$2_depfile_haskell) : $$($1_$2_HS_SRCS) $$($1_$2_HS_BOOT_SRCS) $$($1_$2_HC_MK_DEPEND_DEP) | $$$$(dir $$$$@)/.
30 "$$(RM)" $$(RM_OPTS) $$@.tmp
31 touch $$@.tmp
32 ifneq "$$($1_$2_HS_SRCS)" ""
33 "$$($1_$2_HC_MK_DEPEND)" -M $$($1_$2_MKDEPENDHS_FLAGS) \
34 $$(filter-out -split-objs, $$($1_$2_v_ALL_HC_OPTS)) \
35 $$($1_$2_HS_SRCS)
36 endif
37 echo "$1_$2_depfile_haskell_EXISTS = YES" >> $$@.tmp
38 ifneq "$$($1_$2_SLASH_MODS)" ""
39 for dir in $$(sort $$(foreach mod,$$($1_$2_SLASH_MODS),$1/$2/build/$$(dir $$(mod)))); do \
40 if test ! -d $$$$dir; then mkdir -p $$$$dir; fi \
41 done
42 endif
43 # Some packages are from the bootstrapping compiler, so are not
44 # within the build tree. On Windows this causes a problem as they look
45 # like bad rules, due to the two colons, so we filter them out.
46 grep -v ' : [a-zA-Z]:/' $$@.tmp > $$@
47
48 # Some of the C files depend on the generated includes files.
49 $$($1_$2_depfile_c_asm) : $$(includes_H_CONFIG) $$(includes_H_PLATFORM)
50
51 $$($1_$2_depfile_c_asm) : $$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES) | $$$$(dir $$$$@)/.
52 "$$(RM)" $$(RM_OPTS) $$@.tmp
53 touch $$@.tmp
54 ifneq "$$(strip $$($1_$2_C_FILES_DEPS)$$($1_$2_S_FILES))" ""
55 # We ought to actually do this for each way in $$($1_$2_WAYS), but then
56 # it takes a long time to make the C deps for the RTS (30 seconds rather
57 # than 3), so instead we just pass the list of ways in and let addCFileDeps
58 # copy the deps for each way on the assumption that they are the same
59 $$(foreach f,$$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES), \
60 $$(call addCFileDeps,$1,$2,$$($1_$2_depfile_c_asm),$$f,$$($1_$2_WAYS)))
61 "$$(RM)" $$(RM_OPTS) $$@.bit
62 endif
63 echo "$1_$2_depfile_c_asm_EXISTS = YES" >> $$@.tmp
64 mv $$@.tmp $$@
65
66 endif # $1_$2_NO_BUILD_DEPS
67
68 # Note sed magic above: mkdependC can't do -odir stuff, so we have to
69 # munge the dependencies it generates to refer to the correct targets.
70
71 endef
72
73 # This comment is outside the "define addCFileDeps" as that definition
74 # is a list of command lines, and if it is inside it then we pass this
75 # comment to the shell every time we call the definition.
76 # $1 = dir
77 # $2 = distdir
78 # $3 = depfile
79 # $4 = file
80 # $5 = ways
81 #
82 # The formatting of this definition (e.g. the blank line above) is
83 # important, in order to get make to generate the right makefile code.
84 #
85 # 's|\\|/|g'
86 # We first normalise all slashes to be forward slashes. Note that
87 # $(TOP) also uses forward slashes.
88 # 's| /$$| \\|'
89 # But now we need to fix the line continuation characters that we
90 # just broke.
91 # "1s|\.o|\.$($w_osuf)|"
92 # We will have dependencies for .o files, so we need to fix them up
93 # for the right object suffix for the way we're doing
94 # "1s|^|$(dir $4)|"
95 # We always get deps for just foo.o when the file we're making is
96 # a/b/c/foo.o, so we need to prepend the directory of the source file
97 # "1s|$1/|$1/$2/build/|"
98 # Well, almost. We actually need to insert e.g. "dist/build" in the
99 # middle of that directory
100 # "1s|$2/build/$2/build|$2/build|g"
101 # But some source files, e.g. sm/Evac_thr.c, are also inside the
102 # "dist/build" directory, so now we've just made
103 # "dist/build/dist/build", so we need to remove the duplication
104 # again
105 # "s|$(TOP)/||g$(CASE_INSENSITIVE_SED)"
106 # Finally, when making deps for packages like ghc stage2, we have
107 # some include paths for packages registered in the in-tree package
108 # database. These include paths are full (i.e. not relative) paths,
109 # which means that the "cpp -MM" output uses full paths in some cases.
110 # This causes 2 problems:
111 # * they don't match up with the rules to rebuild the files, where
112 # appropriate.
113 # * on Windows, make interprets the colon in c:/foo/bar.h as make
114 # syntax.
115 # So we sed off $(TOP). Unfortunately, on Windows, the case for the
116 # drive letter is sometimes different in what $(TOP) starts with, and
117 # what the path in the package database starts with. We therefore
118 # need to do the substitution case-insensitively on Windows. But
119 # the s///i modifier isn't portable, so we set CASE_INSENSITIVE_SED
120 # to "i" on Windows and "" on any other platform.
121 define addCFileDeps
122
123 $(CPP) $($1_$2_MKDEPENDC_OPTS) $($1_$2_v_ALL_CC_OPTS) $($(basename $4)_CC_OPTS) -MM $4 -MF $3.bit
124 $(foreach w,$5,sed -e 's|\\|/|g' -e 's| /$$| \\|' -e "1s|\.o|\.$($w_osuf)|" -e "1s|^|$(dir $4)|" -e "1s|$1/|$1/$2/build/|" -e "1s|$2/build/$2/build|$2/build|g" -e "s|$(TOP)/||g$(CASE_INSENSITIVE_SED)" $3.bit >> $3.tmp &&) true
125 endef
126
127 ifeq "$(Windows)" "YES"
128 CASE_INSENSITIVE_SED = i
129 else
130 CASE_INSENSITIVE_SED =
131 endif
132