| From | Ingo Molnar <> | Subject | [PATCH 03/52] tools/perf/build: Add 'autodep' functionality, generate feature test dependencies automatically | Date | Tue, 8 Oct 2013 12:10:33 +0200 |
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Use GCC's -MD feature to generate a dependency file for each feature test .c file, and include that .d file in the config/feature-checks/Makefile.
This allows us to do two things:
- speed up feature tests - detect removal or changes in build dependencies - including system libraries/headers
Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/n/tip-Jfma8pmPnnqzpxjbs3hpgmsj@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> --- tools/perf/config/feature-checks/Makefile | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile index b3f6372..4708cca 100644 --- a/tools/perf/config/feature-checks/Makefile +++ b/tools/perf/config/feature-checks/Makefile @@ -1,16 +1,20 @@ FILES=test-hello +CC := $(CC) -MD + all: $(FILES) BUILD = $(CC) -o $(OUTPUT)$@ $@.c ############################### -test-hello: test-hello.c +test-hello: $(BUILD) +-include *.d */*.d + ############################### clean: - rm -f $(FILES) + rm -f $(FILES) *.d -- 1.8.3.1
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