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authorLibravatar Jonathan Nieder <jrnieder@gmail.com>2010-01-26 09:52:49 -0600
committerLibravatar Jonathan Nieder <jrnieder@gmail.com>2010-01-26 10:08:55 -0600
commitdfea575017ddc2ae7c9e8dcb978f4557f07715d3 (patch)
tree9e1e30e1fe6accd016c8be2b892044148f3acacc /Makefile
parentMakefile: list generated object files in OBJECTS (diff)
downloadtgif-dfea575017ddc2ae7c9e8dcb978f4557f07715d3.tar.xz
Makefile: lazily compute header dependencies
Use the gcc -MMD -MP -MF options to generate dependency rules as a byproduct when building .o files if the COMPUTE_HEADER_DEPENDENCIES variable is defined. That variable is left undefined by default for now. As each object file is built, write a makefile fragment containing its dependencies in the deps/ subdirectory of its containing directory. The deps/ directories should be generated if they are missing at the start of each build. So let each object file depend on $(missing_dep_dirs), which lists only the directories of this kind that are missing to avoid needlessly regenerating files when the directories' timestamps change. gcc learned the -MMD -MP -MF options in version 3.0, so most gcc users should have them by now. The dependencies this option computes are more specific than the rough estimates hard-coded in the Makefile, greatly speeding up rebuilds when only a little-used header file has changed. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile49
1 files changed, 44 insertions, 5 deletions
diff --git a/Makefile b/Makefile
index a3774f7172..df361737b0 100644
--- a/Makefile
+++ b/Makefile
@@ -217,6 +217,10 @@ all::
# DEFAULT_EDITOR='~/bin/vi',
# DEFAULT_EDITOR='$GIT_FALLBACK_EDITOR',
# DEFAULT_EDITOR='"C:\Program Files\Vim\gvim.exe" --nofork'
+#
+# Define COMPUTE_HEADER_DEPENDENCIES if your compiler supports the -MMD option
+# and you want to avoid rebuilding objects when an unrelated header file
+# changes.
GIT-VERSION-FILE: FORCE
@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -1677,14 +1681,48 @@ ASM_SRC := $(wildcard $(OBJECTS:o=S))
ASM_OBJ := $(ASM_SRC:S=o)
C_OBJ := $(filter-out $(ASM_OBJ),$(OBJECTS))
+ifdef COMPUTE_HEADER_DEPENDENCIES
+dep_dirs := $(addsuffix deps,$(sort $(dir $(OBJECTS))))
+$(dep_dirs):
+ mkdir -p $@
+
+missing_dep_dirs := $(filter-out $(wildcard $(dep_dirs)),$(dep_dirs))
+else
+dep_dirs =
+missing_dep_dirs =
+endif
+
.SUFFIXES:
-$(C_OBJ): %.o: %.c GIT-CFLAGS
- $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
+$(C_OBJ): %.o: %.c GIT-CFLAGS $(missing_dep_dirs)
+ $(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $<
%.s: %.c GIT-CFLAGS FORCE
$(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
-$(ASM_OBJ): %.o: %.S GIT-CFLAGS
- $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
+$(ASM_OBJ): %.o: %.S GIT-CFLAGS $(missing_dep_dirs)
+ $(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $<
+
+ifdef COMPUTE_HEADER_DEPENDENCIES
+# Take advantage of gcc's on-the-fly dependency generation
+# See <http://gcc.gnu.org/gcc-3.0/features.html>.
+dep_files := $(wildcard $(foreach f,$(OBJECTS),$(dir f)deps/$(notdir $f).d))
+ifneq ($(dep_files),)
+include $(dep_files)
+endif
+
+dep_file = $(dir $@)deps/$(notdir $@).d
+dep_args = -MF $(dep_file) -MMD -MP
+else
+dep_args =
+
+# Dependencies on header files, for platforms that do not support
+# the gcc -MMD option.
+#
+# Dependencies on automatically generated headers such as common-cmds.h
+# should _not_ be included here, since they are necessary even when
+# building an object for the first time.
+#
+# XXX. Please check occasionally that these include all dependencies
+# gcc detects!
$(GIT_OBJS): $(LIB_H)
builtin-branch.o builtin-checkout.o builtin-clone.o builtin-reset.o branch.o transport.o: branch.h
@@ -1700,10 +1738,10 @@ builtin-pack-objects.o: thread-utils.h
http-fetch.o http-walker.o remote-curl.o transport.o walker.o: walker.h
http.o http-walker.o http-push.o remote-curl.o: http.h
-
xdiff-interface.o $(XDIFF_OBJS): \
xdiff/xinclude.h xdiff/xmacros.h xdiff/xdiff.h xdiff/xtypes.h \
xdiff/xutils.h xdiff/xprepare.h xdiff/xdiffi.h xdiff/xemit.h
+endif
exec_cmd.s exec_cmd.o: ALL_CFLAGS += \
'-DGIT_EXEC_PATH="$(gitexecdir_SQ)"' \
@@ -2011,6 +2049,7 @@ clean:
$(RM) $(ALL_PROGRAMS) $(BUILT_INS) git$X
$(RM) $(TEST_PROGRAMS)
$(RM) -r bin-wrappers
+ $(RM) -r $(dep_dirs)
$(RM) *.spec *.pyc *.pyo */*.pyc */*.pyo common-cmds.h TAGS tags cscope*
$(RM) -r autom4te.cache
$(RM) config.log config.mak.autogen config.mak.append config.status config.cache