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Date: Mon, 14 Oct 2013 22:12:41 -0700
From: tip-bot for Ingo Molnar <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
mingo@...nel.org, a.p.zijlstra@...llo.nl, namhyung@...nel.org,
jolsa@...hat.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] tools/perf/build: Add feature check core code
Commit-ID: b6aa9979416e2e98a800925d60ad00e83bc7cb7a
Gitweb: http://git.kernel.org/tip/b6aa9979416e2e98a800925d60ad00e83bc7cb7a
Author: Ingo Molnar <mingo@...nel.org>
AuthorDate: Mon, 30 Sep 2013 10:08:24 +0200
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 9 Oct 2013 08:48:28 +0200
tools/perf/build: Add feature check core code
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@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/n/tip-pixkihgscFaohfFigq5yt9gs@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
tools/perf/config/Makefile | 16 ++++++++++++++++
tools/perf/config/feature-checks/Makefile | 16 ++++++++++++++++
tools/perf/config/feature-checks/test-hello.c | 6 ++++++
3 files changed, 38 insertions(+)
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 34be743..daefe2d 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -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
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
new file mode 100644
index 0000000..b3f6372
--- /dev/null
+++ b/tools/perf/config/feature-checks/Makefile
@@ -0,0 +1,16 @@
+
+FILES=test-hello
+
+all: $(FILES)
+
+BUILD = $(CC) -o $(OUTPUT)$@ $@.c
+
+###############################
+
+test-hello: test-hello.c
+ $(BUILD)
+
+###############################
+
+clean:
+ rm -f $(FILES)
diff --git a/tools/perf/config/feature-checks/test-hello.c b/tools/perf/config/feature-checks/test-hello.c
new file mode 100644
index 0000000..c9f398d
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-hello.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(void)
+{
+ return puts("hi");
+}
--
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