Makefile: autobuild dependency rules

This uses gcc to generate dependency rules for each `.o` file, based on the
corresponding `.c` file, into a new set of `.d` files (which are also defined
to depend on the same set of source files as their `.o` files).

Result:
* all objectfile dependencies are correctly calculated
* only the necessary dependencies are recalculated when a sourcefile is updated

Inspiration for the build rules:
* http://www.gnu.org/software/make/manual/make.html#Automatic-Prerequisites
* http://make.paulandlesley.org/autodep.html

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
This commit is contained in:
Lars Hjemli 2008-03-24 23:01:44 +01:00
parent 271818693d
commit df90b51baf
2 changed files with 11 additions and 1 deletions

1
.gitignore vendored
View File

@ -3,3 +3,4 @@ cgit
cgit.conf
VERSION
*.o
*.d

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@ -13,6 +13,13 @@ GIT_URL = http://www.kernel.org/pub/software/scm/git/git-$(GIT_VER).tar.bz2
-include cgit.conf
#
# Define a pattern rule for automatic dependency building
#
%.d: %.c
$(CC) $(CFLAGS) -MM $< | sed -e 's/\($*\)\.o:/\1.o $@:/g' >$@
EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto
OBJECTS =
OBJECTS += cache.o
@ -61,6 +68,8 @@ cgit: $(OBJECTS)
$(OBJECTS): git/xdiff/lib.a git/libgit.a VERSION
-include $(OBJECTS:.o=.d)
git/xdiff/lib.a: | git
git/libgit.a: | git
@ -84,7 +93,7 @@ uninstall:
rm -f $(CGIT_SCRIPT_PATH)/cgit.png
clean:
rm -f cgit VERSION *.o
rm -f cgit VERSION *.o *.d
cd git && $(MAKE) clean
distclean: clean