From 9f7ef9854e800bc3bab3d9a527e8f8f960eec1a6 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 23 Sep 2015 12:33:58 +0200 Subject: tools build: Add fixdep dependency helper For dependency tracking we currently use targets that fall out of the gcc -MD command. We store this info in the .cmd file and include as makefile during the build. This format put object as target and all the c and header files as dependencies, like: util/abspath.o: util/abspath.c /usr/include/stdc-predef.h util/cache.h \ /usr/include/bits/wordsize.h /usr/include/gnu/stubs.h \ ... If any of those dependency header files (krava.h below) is removed the build fails on: make[1]: *** No rule to make target 'krava.h', needed by 'inc.o'. Stop. This patch adds fixdep helper, that is used by kbuild to alter the shape of the object dependencies like: source_util/abspath.o := util/abspath.c deps_util/abspath.o := \ /usr/include/stdc-predef.h \ util/cache.h \ ... util/abspath.o: $(deps_util/abspath.o) $(deps_util/abspath.o): With this format the header removal won't make the build fail, because it'll be picked up by the last empty target defined for each header. As previously mentioned the fixdep tool is taken from kbuild. It's not complete backport, only the part that alters the standard dependency info was taken, the part that adds the CONFIG_* dependency logic will be probably taken later on. Signed-off-by: Jiri Olsa Cc: David Ahern Cc: Kai Germaschewski Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1443004442-32660-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/build/Build | 1 + 1 file changed, 1 insertion(+) create mode 100644 tools/build/Build (limited to 'tools/build/Build') diff --git a/tools/build/Build b/tools/build/Build new file mode 100644 index 000000000000..63a6c34c0c88 --- /dev/null +++ b/tools/build/Build @@ -0,0 +1 @@ +fixdep-y := fixdep.o -- cgit v1.2.3