Most of the build targets do not care about the setting of
$prefix (or its derivative variables), but will be rebuilt
if the prefix changes. For most setups this doesn't matter
(they set prefix once and never change it), but for a setup
which puts each branch or version in its own prefix, this
unnecessarily causes a full rebuild whenever the branc is
changed.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
We could break this down even further and save a few compilations (e.g.,
config.o does not care about bindir, only sysconfdir). But given that
most people just set prefix anyway, I don't think it's worth the extra
lines of Makefile (and this patch will never generate a _wrong_ answer;
it is too conservative in doing extra compiles).
.gitignore | 1 +
Makefile | 29 +++++++++++++++++++++--------
2 files changed, 22 insertions(+), 8 deletions(-)
diff --git a/.gitignore b/.gitignore
index 7329cfe..c60c5a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
/GIT-CFLAGS
/GIT-LDFLAGS
/GIT-GUI-VARS
+/GIT-PREFIX
/GIT-USER-AGENT
/GIT-VERSION-FILE
/bin-wrappers/
diff --git a/Makefile b/Makefile
index 42ce2dd..9761ae8 100644
--- a/Makefile
+++ b/Makefile
@@ -1976,7 +1976,7 @@ shell_compatibility_test: please_set_SHELL_PATH_to_a_more_modern_shell
strip: $(PROGRAMS) git$X
$(STRIP) $(STRIP_OPTS) $(PROGRAMS) git$X
-git.sp git.s git.o: common-cmds.h
+git.sp git.s git.o: common-cmds.h GIT-PREFIX
git.sp git.s git.o: EXTRA_CPPFLAGS = \
'-DGIT_HTML_PATH="$(htmldir_SQ)"' \
'-DGIT_MAN_PATH="$(mandir_SQ)"' \
@@ -1988,7 +1988,7 @@ git$X: git.o GIT-LDFLAGS $(BUILTIN_OBJS) $(GITLIBS)
help.sp help.s help.o: common-cmds.h
-builtin/help.sp builtin/help.s builtin/help.o: common-cmds.h
+builtin/help.sp builtin/help.s builtin/help.o: common-cmds.h GIT-PREFIX
builtin/help.sp builtin/help.s builtin/help.o: EXTRA_CPPFLAGS = \
'-DGIT_HTML_PATH="$(htmldir_SQ)"' \
'-DGIT_MAN_PATH="$(mandir_SQ)"' \
@@ -2036,7 +2036,7 @@ $(SCRIPT_LIB) : % : %.sh
ifndef NO_PERL
$(patsubst %.perl,%,$(SCRIPT_PERL)): perl/perl.mak
-perl/perl.mak: GIT-CFLAGS perl/Makefile perl/Makefile.PL
+perl/perl.mak: GIT-CFLAGS GIT-PREFIX perl/Makefile perl/Makefile.PL
$(QUIET_SUBDIR0)perl $(QUIET_SUBDIR1) PERL_PATH='$(PERL_PATH_SQ)' prefix='$(prefix_SQ)' $(@F)
$(patsubst %.perl,%,$(SCRIPT_PERL)): % : %.perl
@@ -2080,7 +2080,7 @@ $(patsubst %.perl,%,$(SCRIPT_PERL)) git-instaweb: % : unimplemented.sh
endif # NO_PERL
ifndef NO_PYTHON
-$(patsubst %.py,%,$(SCRIPT_PYTHON)): GIT-CFLAGS
+$(patsubst %.py,%,$(SCRIPT_PYTHON)): GIT-CFLAGS GIT-PREFIX
$(patsubst %.py,%,$(SCRIPT_PYTHON)): % : %.py
$(QUIET_GEN)$(RM) $@ $@+ && \
INSTLIBDIR=`MAKEFLAGS= $(MAKE) -C git_remote_helpers -s \
@@ -2263,20 +2263,25 @@ xdiff-interface.o $(XDIFF_OBJS): $(XDIFF_H)
$(VCSSVN_OBJS) $(VCSSVN_TEST_OBJS): $(LIB_H) $(VCSSVN_H)
endif
+exec_cmd.sp exec_cmd.s exec_cmd.o: GIT-PREFIX
exec_cmd.sp exec_cmd.s exec_cmd.o: EXTRA_CPPFLAGS = \
'-DGIT_EXEC_PATH="$(gitexecdir_SQ)"' \
'-DBINDIR="$(bindir_relative_SQ)"' \
'-DPREFIX="$(prefix_SQ)"'
+builtin/init-db.sp builtin/init-db.s builtin/init-db.o: GIT-PREFIX
builtin/init-db.sp builtin/init-db.s builtin/init-db.o: EXTRA_CPPFLAGS = \
-DDEFAULT_GIT_TEMPLATE_DIR='"$(template_dir_SQ)"'
+config.sp config.s config.o: GIT-PREFIX
config.sp config.s config.o: EXTRA_CPPFLAGS = \
-DETC_GITCONFIG='"$(ETC_GITCONFIG_SQ)"'
+attr.sp attr.s attr.o: GIT-PREFIX
attr.sp attr.s attr.o: EXTRA_CPPFLAGS = \
-DETC_GITATTRIBUTES='"$(ETC_GITATTRIBUTES_SQ)"'
+gettext.sp gettext.s gettext.o: GIT-PREFIX
gettext.sp gettext.s gettext.o: EXTRA_CPPFLAGS = \
-DGIT_LOCALE_PATH='"$(localedir_SQ)"'
@@ -2400,14 +2405,22 @@ cscope:
$(FIND_SOURCE_FILES) | xargs cscope -b
### Detect prefix changes
-TRACK_CFLAGS = $(CC):$(subst ','\'',$(ALL_CFLAGS)):\
- $(bindir_SQ):$(gitexecdir_SQ):$(template_dir_SQ):$(prefix_SQ):\
- $(localedir_SQ):$(USE_GETTEXT_SCHEME)
+TRACK_PREFIX = $(bindir_SQ):$(gitexecdir_SQ):$(template_dir_SQ):$(prefix_SQ):\
+ $(localedir_SQ)
+
+GIT-PREFIX: FORCE
+ @FLAGS='$(TRACK_PREFIX)'; \
+ if test x"$$FLAGS" != x"`cat GIT-PREFIX 2>/dev/null`" ; then \
+ echo 1>&2 " * new prefix flags"; \
+ echo "$$FLAGS" >GIT-PREFIX; \
+ fi
+
+TRACK_CFLAGS = $(CC):$(subst ','\'',$(ALL_CFLAGS)):$(USE_GETTEXT_SCHEME)
GIT-CFLAGS: FORCE
@FLAGS='$(TRACK_CFLAGS)'; \
if test x"$$FLAGS" != x"`cat GIT-CFLAGS 2>/dev/null`" ; then \
- echo 1>&2 " * new build flags or prefix"; \
+ echo 1>&2 " * new build flags"; \
echo "$$FLAGS" >GIT-CFLAGS; \
fi
--
1.7.11.rc3.5.g201460b
--
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