Add a build system dependency; fixes #4357
[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 ifneq "$3" "0"
26 $1_$2_MKDEPENDHS_FLAGS += -include-pkg-deps
27 endif
28
29 ifneq "$$($1_$2_NO_BUILD_DEPS)" "YES"
30
31 $$($1_$2_depfile_haskell) : $$($1_$2_HS_SRCS) $$($1_$2_HS_BOOT_SRCS) $$($1_$2_HC_MK_DEPEND_DEP) | $$$$(dir $$$$@)/.
32 "$$(RM)" $$(RM_OPTS) $$@.tmp
33 touch $$@.tmp
34 ifneq "$$($1_$2_HS_SRCS)" ""
35 "$$($1_$2_HC_MK_DEPEND)" -M $$($1_$2_MKDEPENDHS_FLAGS) \
36 $$(filter-out -split-objs, $$($1_$2_v_ALL_HC_OPTS)) \
37 $$($1_$2_HS_SRCS)
38 endif
39 echo "$1_$2_depfile_haskell_EXISTS = YES" >> $$@.tmp
40 ifneq "$$($1_$2_SLASH_MODS)" ""
41 for dir in $$(sort $$(foreach mod,$$($1_$2_SLASH_MODS),$1/$2/build/$$(dir $$(mod)))); do \
42 if test ! -d $$$$dir; then mkdir -p $$$$dir; fi \
43 done
44 endif
45 mv $$@.tmp $$@
46
47 # Some of the C files depend on the generated includes files.
48 $$($1_$2_depfile_c_asm) : $$(includes_H_CONFIG) $$(includes_H_PLATFORM)
49
50 $$($1_$2_depfile_c_asm) : $$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES) | $$$$(dir $$$$@)/.
51 "$$(RM)" $$(RM_OPTS) $$@.tmp
52 touch $$@.tmp
53 ifneq "$$(strip $$($1_$2_C_FILES_DEPS)$$($1_$2_S_FILES))" ""
54 # We ought to actually do this for each way in $$($1_$2_WAYS), but then
55 # it takes a long time to make the C deps for the RTS (30 seconds rather
56 # than 3), so instead we just pass the list of ways in and let addCFileDeps
57 # copy the deps for each way on the assumption that they are the same
58 $$(foreach f,$$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES), \
59 $$(call addCFileDeps,$1,$2,$$($1_$2_depfile_c_asm),$$f,$$($1_$2_WAYS)))
60 "$$(RM)" $$(RM_OPTS) $$@.bit
61 endif
62 echo "$1_$2_depfile_c_asm_EXISTS = YES" >> $$@.tmp
63 mv $$@.tmp $$@
64
65 endif # $1_$2_NO_BUILD_DEPS
66
67 # Note sed magic above: mkdependC can't do -odir stuff, so we have to
68 # munge the dependencies it generates to refer to the correct targets.
69
70 # Seems as good a place as any to attach the unlit dependency
71 $$($1_$2_depfile_haskell) : $$(UNLIT)
72
73 ifneq "$$(NO_INCLUDE_DEPS)" "YES"
74 ifneq "$$(strip $$($1_$2_HS_SRCS) $$($1_$2_HS_BOOT_SRCS))" ""
75 ifneq "$$(NO_STAGE$3_DEPS)" "YES"
76 include $$($1_$2_depfile_haskell)
77 endif
78 endif
79 include $$($1_$2_depfile_c_asm)
80 else
81 ifeq "$$(DEBUG)" "YES"
82 $$(warning not building dependencies in $1)
83 endif
84 endif
85
86 endef
87
88 # This comment is outside the "define addCFileDeps" as that definition
89 # is a list of command lines, and if it is inside it then we pass this
90 # comment to the shell every time we call the definition.
91 # $1 = dir
92 # $2 = distdir
93 # $3 = depfile
94 # $4 = file
95 # $5 = ways
96 #
97 # The formatting of this definition (e.g. the blank line above) is
98 # important, in order to get make to generate the right makefile code.
99 #
100 # 's|\\|/|g'
101 # We first normalise all slashes to be forward slashes. Note that
102 # $(TOP) also uses forward slashes.
103 # 's| /$$| \\|'
104 # But now we need to fix the line continuation characters that we
105 # just broke.
106 # "1s|\.o|\.$($w_osuf)|"
107 # We will have dependencies for .o files, so we need to fix them up
108 # for the right object suffix for the way we're doing
109 # "1s|^|$(dir $4)|"
110 # We always get deps for just foo.o when the file we're making is
111 # a/b/c/foo.o, so we need to prepend the directory of the source file
112 # "1s|$1/|$1/$2/build/|"
113 # Well, almost. We actually need to insert e.g. "dist/build" in the
114 # middle of that directory
115 # "1s|$2/build/$2/build|$2/build|g"
116 # But some source files, e.g. sm/Evac_thr.c, are also inside the
117 # "dist/build" directory, so now we've just made
118 # "dist/build/dist/build", so we need to remove the duplication
119 # again
120 # "s|$(TOP)/||g$(CASE_INSENSITIVE_SED)"
121 # Finally, when making deps for packages like ghc stage2, we have
122 # some include paths for packages registered in the in-tree package
123 # database. These include paths are full (i.e. not relative) paths,
124 # which means that the "cpp -MM" output uses full paths in some cases.
125 # This causes 2 problems:
126 # * they don't match up with the rules to rebuild the files, where
127 # appropriate.
128 # * on Windows, make interprets the colon in c:/foo/bar.h as make
129 # syntax.
130 # So we sed off $(TOP). Unfortunately, on Windows, the case for the
131 # drive letter is sometimes different in what $(TOP) starts with, and
132 # what the path in the package database starts with. We therefore
133 # need to do the substitution case-insensitively on Windows. But
134 # the s///i modifier isn't portable, so we set CASE_INSENSITIVE_SED
135 # to "i" on Windows and "" on any other platform.
136 define addCFileDeps
137
138 $(CPP) $($1_$2_MKDEPENDC_OPTS) $($1_$2_v_ALL_CC_OPTS) $($(basename $4)_CC_OPTS) -MM $4 -MF $3.bit
139 $(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 >> $3.tmp &&) true
140 endef
141
142 ifeq "$(Windows)" "YES"
143 CASE_INSENSITIVE_SED = i
144 else
145 CASE_INSENSITIVE_SED =
146 endif
147