linux-kernel - [tip:perf/core] perf build: Fix libunwind feature detection on 32-bit x86

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Date:	Wed, 27 May 2015 09:46:33 -0700
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
	namhyung@...il.com, acme@...hat.com, mingo@...nel.org,
	jolsa@...hat.com, hpa@...or.com, tglx@...utronix.de
Subject: [tip:perf/core] perf build:
  Fix libunwind feature detection on 32-bit x86

Commit-ID:  05b41775e2edd69a83f592e3534930c934d4038e
Gitweb:     http://git.kernel.org/tip/05b41775e2edd69a83f592e3534930c934d4038e
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Tue, 19 May 2015 16:05:43 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 27 May 2015 12:21:43 -0300

perf build: Fix libunwind feature detection on 32-bit x86

The libunwind feature would never detect because of the following error:

  $ cat tools/build/feature/test-libunwind.make.output
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_stream_buffer_decode'
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_index_uncompressed_size'
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_index_end'
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_index_buffer_decode'
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_stream_footer_decode'
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: undefined reference to `lzma_index_size'
  collect2: error: ld returned 1 exit status

Fix by adding -llzma and re-ordering to match the dependencies.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...il.com>
Link: http://lkml.kernel.org/r/1432040746-1755-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/config/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 1b957a1..e3b3724 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -32,7 +32,7 @@ ifeq ($(ARCH),x86)
     LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
     $(call detected,CONFIG_X86_64)
   else
-    LIBUNWIND_LIBS = -lunwind -lunwind-x86
+    LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind
   endif
   NO_PERF_REGS := 0
 endif
--
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