linux-kernel - [PATCH 16/50] tools/perf/build: Split out feature check: 'libelf-getphdrnum'

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Date:	Mon,  7 Oct 2013 13:56:09 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 16/50] tools/perf/build: Split out feature check: 'libelf-getphdrnum'

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-wa9qstb8erbjreLxiHepzjfw@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/perf/config/Makefile                                | 5 +++--
 tools/perf/config/feature-checks/Makefile                 | 4 ++++
 tools/perf/config/feature-checks/test-libelf-getphdrnum.c | 7 +++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 1846559..2fcef1f 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -112,6 +112,7 @@ FEATURE_TESTS =				\
 	glibc				\
 	dwarf				\
 	libelf-mmap			\
+	libelf-getphdrnum		\
 	libnuma
 
 $(foreach test,$(FEATURE_TESTS),$(call feature_check,$(test),$(test)))
@@ -206,7 +207,7 @@ ifndef NO_LIBELF
     CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
   endif
 
-  ifeq ($(call try-cc,$(SOURCE_ELF_GETPHDRNUM),$(FLAGS_LIBELF),-DHAVE_ELF_GETPHDRNUM_SUPPORT),y)
+  ifeq ($(feature-libelf-getphdrnum), 1)
     CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
   endif
 
@@ -229,7 +230,7 @@ ifndef NO_LIBELF
   CFLAGS += -DHAVE_LIBELF_SUPPORT
   ifeq ($(feature-libelf-mmap), 1)
     CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
-  endif # try-cc
+  endif
 endif # NO_LIBELF
 
 # There's only x86 (both 32 and 64) support for CFI unwind so far
diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index bf96e34..83b3a02 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -10,6 +10,7 @@ FILES=					\
 	test-glibc			\
 	test-dwarf			\
 	test-libelf-mmap		\
+	test-libelf-getphdrnum		\
 	test-libnuma
 
 CC := $(CC) -MD
@@ -50,6 +51,9 @@ test-dwarf:
 test-libelf-mmap:
 	$(BUILD) -lelf
 
+test-libelf-getphdrnum:
+	$(BUILD) -lelf
+
 test-libnuma:
 	$(BUILD) -lnuma
 
diff --git a/tools/perf/config/feature-checks/test-libelf-getphdrnum.c b/tools/perf/config/feature-checks/test-libelf-getphdrnum.c
new file mode 100644
index 0000000..58eca53
--- /dev/null
+++ b/tools/perf/config/feature-checks/test-libelf-getphdrnum.c
@@ -0,0 +1,7 @@
+#include <libelf.h>
+#
+int main(void)
+{
+	size_t dst;
+	return elf_getphdrnum(0, &dst);
+}
-- 
1.7.11.7

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