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tools/perf/build: Add 'autodep' functionality, generate feature test dependencies automatically

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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>
This commit is contained in:
Ingo Molnar 2013-09-30 13:51:28 +02:00
parent b6aa997941
commit 8b6eb56a95
1 changed files with 6 additions and 2 deletions
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8
tools/perf/config/feature-checks/Makefile
View File

@ -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