linux-kernel - [PATCH 5/5] perf tools: Fix LIBELF

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Date:	Fri, 26 Oct 2012 17:55:52 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Jiri Olsa <jolsa@...hat.com>, Borislav Petkov <bp@...64.org>
Subject: [PATCH 5/5] perf tools: Fix LIBELF_MMAP checking

From: Namhyung Kim <namhyung.kim@....com>

Currently checking mmap support in libelf failed due to wrong flags.

    CHK libelf
    CHK libdw
    CHK libunwind
    CHK -DLIBELF_MMAP
/tmp/ccYJwdR0.o: In function `main':
:(.text+0x18): undefined reference to `elf_begin'
collect2: error: ld returned 1 exit status

This cannot happen since we checked the elf_begin() when checking
libelf and it succeeded.

Fix it by using a same flag with libelf checking.

Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Borislav Petkov <bp@...64.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 2d0c09ab58b8..629fc6a4b0df 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -541,7 +541,8 @@ LIB_OBJS += $(OUTPUT)util/symbol-minimal.o
 else # NO_LIBELF
 BASIC_CFLAGS += -DLIBELF_SUPPORT
 
-ifeq ($(call try-cc,$(SOURCE_ELF_MMAP),$(FLAGS_COMMON),-DLIBELF_MMAP),y)
+FLAGS_LIBELF=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS)
+ifeq ($(call try-cc,$(SOURCE_ELF_MMAP),$(FLAGS_LIBELF),-DLIBELF_MMAP),y)
 	BASIC_CFLAGS += -DLIBELF_MMAP
 endif
 
-- 
1.7.11.7

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