path: root/tools/build/Build
diff options
authorJiri Olsa <>2015-09-23 12:33:58 +0200
committerArnaldo Carvalho de Melo <>2015-09-28 15:50:55 -0300
commit9f7ef9854e800bc3bab3d9a527e8f8f960eec1a6 (patch)
treeea1228ac76dcc0954798be4066b93c9189a0e295 /tools/build/Build
parent0c00c3fb4e4a6ff714b7ad864f58e0fb33b3534c (diff)
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: Signed-off-by: Arnaldo Carvalho de Melo <>
Diffstat (limited to 'tools/build/Build')
1 files changed, 1 insertions, 0 deletions
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