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