X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rules%2Fbuild-dependencies.mk;h=8f52bc50587102157c7396fef36851cc32a106ee;hb=29bc0d199c6596232e7d287cf5a1671a5c30b317;hp=d6cf33ea8aeb0fdc412dad8e90e68b260f19bea7;hpb=071f080ab938648063db1e3c9e0b4d01e9621b1f;p=ghc-hetmet.git

diff --git a/rules/build-dependencies.mk b/rules/build-dependencies.mk
index d6cf33e..8f52bc5 100644
--- a/rules/build-dependencies.mk
+++ b/rules/build-dependencies.mk
@@ -45,9 +45,12 @@ $$($1_$2_depfile_c_asm) : $$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES) | $$$$(dir $$
 	"$$(RM)" $$(RM_OPTS) $$@.tmp
 	touch $$@.tmp
 ifneq "$$(strip $$($1_$2_C_FILES_DEPS)$$($1_$2_S_FILES))" ""
+# We ought to actually do this for each way in $$($1_$2_WAYS), but then
+# it takes a long time to make the C deps for the RTS (30 seconds rather
+# than 3), so instead we just pass the list of ways in and let addCFileDeps
+# copy the deps for each way on the assumption that they are the same
 	$$(foreach f,$$($1_$2_C_FILES_DEPS) $$($1_$2_S_FILES), \
-	  $$(foreach w,$$($1_$2_WAYS), \
-	    $$(call addCFileDeps,$1,$2,$$($1_$2_depfile_c_asm),$$f,$$w)))
+	    $$(call addCFileDeps,$1,$2,$$($1_$2_depfile_c_asm),$$f,$$($1_$2_WAYS)))
 	"$$(RM)" $$(RM_OPTS) $$@.bit
 endif
 	echo "$1_$2_depfile_c_asm_EXISTS = YES" >> $$@.tmp
@@ -79,12 +82,34 @@ endef
 # $2 = distdir
 # $3 = depfile
 # $4 = file
-# $5 = way
+# $5 = ways
+#
 # The formatting of this definition (e.g. the blank line above) is
 # important, in order to get make to generate the right makefile code.
+#
+# "1s|\.o|\.$($w_osuf)|"
+#    We will have dependencies for .o files, so we need to fix them up
+#    for the right object suffix for the way we're doing
+# "1s|^|$(dir $4)|"
+#    We always get deps for just foo.o when the file we're making is
+#    a/b/c/foo.o, so we need to prepend the directory of the source file
+# "1s|$1/|$1/$2/build/|"
+#    Well, almost. We actually need to insert e.g. "dist/build" in the
+#    middle of that directory
+# "1s|$2/build/$2/build|$2/build|g"
+#    But some source files, e.g. sm/Evac_thr.c, are also inside the
+#    "dist/build" directory, so now we've just made
+#    "dist/build/dist/build", so we need to remove the duplication
+#    again
+# "s|$(TOP)/||gi"
+#    Finally, cpp -MM will give us full paths for some files, but this
+#    causes problems on Windows where make interprets the colon in
+#    c:/foo/bar.h as make syntax. So we sed off $(TOP) (case
+#    insensitively, as sometimes you get C:/... when you are expecting
+#    c:/... or vice versa)
 define addCFileDeps
 
-	$(CPP) $($1_$2_MKDEPENDC_OPTS) $($1_$2_$5_ALL_CC_OPTS) $($(basename $4)_CC_OPTS) -MM $4 -MF $3.bit
-	sed -e "1s|\.o|\.$($5_osuf)|" -e "1s|^|$(dir $4)|" -e "1s|$1/|$1/$2/build/|" -e "s|$(TOP)/||g" -e "s|$2/build/$2/build|$2/build|g" $3.bit >> $3.tmp
+	$(CPP) $($1_$2_MKDEPENDC_OPTS) $($1_$2_v_ALL_CC_OPTS) $($(basename $4)_CC_OPTS) -MM $4 -MF $3.bit
+	$(foreach w,$5,sed -e "1s|\.o|\.$($w_osuf)|" -e "1s|^|$(dir $4)|" -e "1s|$1/|$1/$2/build/|" -e "1s|$2/build/$2/build|$2/build|g" -e "s|$(TOP)/||gi" $3.bit >> $3.tmp &&) true
 endef