tools/perf/build: Add feature check core code (b6aa9979) · Commits · 戴 / test

Start the split-out of the feature check code by adding a list of features to be tested, and rules to process that list by building its matching feature-check file in config/feature-checks/test-<feature>.c. Add 'hello' as the initial feature. This structure will allow us to build split-out feature checks in parallel and thus speed up feature detection dramatically. No change in functionality: no feature check is used by the build rules yet. 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-pixkihgscFaohfFigq5yt9gs@git.kernel.org Signed-off-by:

Ingo Molnar <mingo@kernel.org>

tools/perf/config/Makefile

+16 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,22 @@ CFLAGS += -std=gnu99

		EXTLIBS = -lelf -lpthread -lrt -lm -ldl

		feature_check = $(eval $(feature_check_code)); $(info CHK: config/feature-checks/test-$(1))
		define feature_check_code
		feature-$(2) := $(shell make -C config/feature-checks test-$1 >/dev/null 2>/dev/null && echo 1 \|\| echo 0)
		endef

		#
		# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
		#
		$(info Testing features:)
		$(shell make -i -j -C config/feature-checks >/dev/null 2>&1)
		$(info done)

		FEATURE_TESTS = hello

		$(foreach test,$(FEATURE_TESTS),$(call feature_check,$(test),$(test)))

		ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -Werror -fstack-protector-all,-fstack-protector-all),y)
		CFLAGS += -fstack-protector-all
		endif

tools/perf/config/feature-checks/Makefile

0 → 100644

+16 −0

Original line number	Diff line number	Diff line

		FILES=test-hello

		all: $(FILES)

		BUILD = $(CC) -o $(OUTPUT)$@ $@.c

		###############################

		test-hello: test-hello.c
		$(BUILD)

		###############################

		clean:
		rm -f $(FILES)

tools/perf/config/feature-checks/test-hello.c

0 → 100644

+6 −0

Original line number	Diff line number	Diff line
		#include <stdio.h>

		int main(void)
		{
		return puts("hi");
		}

Admin message