path: root/cgit.mk
diff options
authorJohn Keeping <john@keeping.me.uk>2013-03-06 21:22:06 +0000
committerJason A. Donenfeld <Jason@zx2c4.com>2013-03-20 21:08:32 +0100
commit5f323c1ff45c10d8f8b0a673d2fe7e98272f5d78 (patch)
tree9f34b5e59ba56ec8551a7da5df731b231164069a /cgit.mk
parenttests: check that Git version are in sync (diff)
Makefile: re-use Git's Makefile where possible
Git does quite a lot of platform-specific detection in its Makefile, which can result in it defining preprocessor variables that are used in its header files. If CGit does not define the same variables it can result in different sizes of some structures in different places in the same application. For example, on Solaris Git uses it's "compat" regex library which has a different sized regex_t structure than that available in the platform regex.h. This has a knock-on effect on the size of "struct rev_info" and leads to hard to diagnose runtime issues. In order to avoid all of this, introduce a "cgit.mk" file that includes Git's Makefile and make all of the existing logic apply to CGit's objects as well. This is slightly complicated because Git's Makefile must run in Git's directory, so all references to CGit files need to be prefixed with "../". In addition, OBJECTS is a simply expanded variable in Git's Makefile so we cannot just add our objects to it. Instead we must copy the two applicable rules into "cgit.mk". This has the advantage that we can split CGit-specific CFLAGS from Git's CFLAGS and hence avoid rebuilding all of Git whenever a CGit-specific value changes. Signed-off-by: John Keeping <john@keeping.me.uk> Acked-by: Jamie Couture <jamie.couture@gmail.com>
Diffstat (limited to 'cgit.mk')
1 files changed, 74 insertions, 0 deletions
diff --git a/cgit.mk b/cgit.mk
new file mode 100644
index 0000000..4869c55
--- /dev/null
+++ b/cgit.mk
@@ -0,0 +1,74 @@
+# This Makefile is run in the "git" directory in order to re-use Git's
+# build variables and operating system detection. Hence all files in
+# CGit's directory must be prefixed with "../".
+include Makefile
+# The CGIT_* variables are inherited when this file is called from the
+# main Makefile - they are defined there.
+$(CGIT_PREFIX)VERSION: force-version
+ @cd $(CGIT_PREFIX) && ./gen-version.sh "$(CGIT_VERSION)"
+.PHONY: force-version
+# CGIT_CFLAGS is a separate variable so that we can track it separately
+# and avoid rebuilding all of Git when these variables change.
+ifdef NO_C99_FORMAT
+CGIT_OBJ_NAMES += cgit.o
+CGIT_OBJ_NAMES += cache.o
+CGIT_OBJ_NAMES += cmd.o
+CGIT_OBJ_NAMES += configfile.o
+CGIT_OBJ_NAMES += html.o
+CGIT_OBJ_NAMES += parsing.o
+CGIT_OBJ_NAMES += scan-tree.o
+CGIT_OBJ_NAMES += shared.o
+CGIT_OBJ_NAMES += ui-atom.o
+CGIT_OBJ_NAMES += ui-blob.o
+CGIT_OBJ_NAMES += ui-clone.o
+CGIT_OBJ_NAMES += ui-commit.o
+CGIT_OBJ_NAMES += ui-diff.o
+CGIT_OBJ_NAMES += ui-log.o
+CGIT_OBJ_NAMES += ui-patch.o
+CGIT_OBJ_NAMES += ui-plain.o
+CGIT_OBJ_NAMES += ui-refs.o
+CGIT_OBJ_NAMES += ui-repolist.o
+CGIT_OBJ_NAMES += ui-shared.o
+CGIT_OBJ_NAMES += ui-snapshot.o
+CGIT_OBJ_NAMES += ui-ssdiff.o
+CGIT_OBJ_NAMES += ui-stats.o
+CGIT_OBJ_NAMES += ui-summary.o
+CGIT_OBJ_NAMES += ui-tag.o
+CGIT_OBJ_NAMES += ui-tree.o
+CGIT_OBJ_NAMES += vector.o
+ifeq ($(wildcard $(CGIT_PREFIX).depend),)
+missing_dep_dirs += $(CGIT_PREFIX).depend
+ @mkdir -p $@
+ @FLAGS='$(subst ','\'',$(CGIT_CFLAGS))'; \
+ if test x"$$FLAGS" != x"`cat ../CGIT-CFLAGS 2>/dev/null`" ; then \
+ echo 1>&2 " * new CGit build flags"; \
+ fi
+$(CGIT_OBJS): %.o: %.c GIT-CFLAGS $(CGIT_PREFIX)CGIT-CFLAGS $(missing_dep_dirs)
+ $(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $<
+ $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)