tools/perf/build: Split out feature check: 'volatile-register-var'

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-5dOevlybbwvbk3zTbcxrrqet@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 9f94912ccf63c0946ecf10b600f4e914b1b23657..a3de2f8bd61a134b197a055f41385b4a39b28bae 100644 (file)
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -105,6 +105,7 @@ FEATURE_TESTS =                             \
        hello                           \
        stackprotector-all              \
        stackprotector                  \
+       volatile-register-var           \
        libnuma
 
 $(foreach test,$(FEATURE_TESTS),$(call feature_check,$(test),$(test)))
@@ -117,7 +118,7 @@ ifeq ($(feature-stackprotector), 1)
   CFLAGS += -Wstack-protector
 endif
 
-ifeq ($(call try-cc,$(SOURCE_HELLO),$(CFLAGS) -Werror -Wvolatile-register-var,-Wvolatile-register-var),y)
+ifeq ($(feature-volatile-register-var), 1)
   CFLAGS += -Wvolatile-register-var
 endif
 

diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index 46b7650983cb6b7200f42a459fd62499d9e0b014..5693299b48061126e07612928ec37dee6afb687f 100644 (file)
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -3,6 +3,7 @@ FILES=                                  \
        test-hello                      \
        test-stackprotector-all         \
        test-stackprotector             \
+       test-volatile-register-var      \
        test-libnuma
 
 CC := $(CC) -MD
@@ -22,6 +23,9 @@ test-stackprotector-all:
 test-stackprotector:
        $(BUILD) -Werror -fstack-protector
 
+test-volatile-register-var:
+       $(BUILD) -Werror -Wvolatile-register-var
+
 test-libnuma:
        $(BUILD) -lnuma
 

diff --git a/tools/perf/config/feature-checks/test-volatile-register-var.c b/tools/perf/config/feature-checks/test-volatile-register-var.c
new file mode 100644 (file)
index 0000000..c9f398d
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-volatile-register-var.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(void)
+{
+       return puts("hi");
+}