linux-kernel - [tip:perf/core] perf tools: Let python use correct gcc for build

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Message-ID: <tip-48d8d5db4ac454e590ef7d440f456743d6cbaa94@git.kernel.org>
Date:	Sun, 26 Jun 2016 03:54:50 -0700
From:	tip-bot for He Kuang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	alexander.shishkin@...ux.intel.com, jpoimboe@...hat.com,
	adrian.hunter@...el.com, peterz@...radead.org, acme@...hat.com,
	tumanova@...ux.vnet.ibm.com, mhiramat@...nel.org,
	dsahern@...il.com, namhyung@...nel.org, mingo@...nel.org,
	kan.liang@...el.com, penberg@...nel.org, eranian@...gle.com,
	jolsa@...hat.com, hekuang@...wei.com, hpa@...or.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	ak@...ux.intel.com, wangnan0@...wei.com, sukadev@...ux.vnet.ibm.com
Subject: [tip:perf/core] perf tools: Let python use correct gcc for
 build_ext

Commit-ID:  48d8d5db4ac454e590ef7d440f456743d6cbaa94
Gitweb:     http://git.kernel.org/tip/48d8d5db4ac454e590ef7d440f456743d6cbaa94
Author:     He Kuang <hekuang@...wei.com>
AuthorDate: Wed, 22 Jun 2016 06:57:05 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 22 Jun 2016 16:11:42 -0300

perf tools: Let python use correct gcc for build_ext

Currently, python uses host gcc instead of cross-compile gcc in the last
step of compiling build_ext(remove '--quiet' to show verbose):

  cross-gcc ...
  cross-gcc ...
  creating ~/out/python_ext_build/lib
  gcc -pthread -shared -Wl,-z ...

This is wrong but may not cause any errors unless the features detected
by cross-compiler do not match those for host compiler, and causes the
following errors:

  /usr/lib64/gcc/bin/ld: cannot find -lunwind-x86
  collect2: error: ld returned 1 exit status
  error: command 'gcc' failed with exit status 1
  cp: cannot stat ‘~/out/python_ext_build/lib/perf.so’: No such file or directory
  Makefile.perf:257: recipe for target '~/out/python/perf.so' failed
  make[1]: *** [~/out/python/perf.so] Error 1
  Makefile:68: recipe for target 'all' failed
  make: *** [all] Error 2

This issue is also reported and anwsered on stackoverflow.
Link: http://stackoverflow.com/questions/5986256/python-distutils-gcc-path

Signed-off-by: He Kuang <hekuang@...wei.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1466578626-92406-5-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Makefile.perf | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index bde8cba..d0a2cb1 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -254,7 +254,8 @@ PYTHON_EXT_SRCS := $(shell grep -v ^\# util/python-ext-sources)
 PYTHON_EXT_DEPS := util/python-ext-sources util/setup.py $(LIBTRACEEVENT) $(LIBAPI)
 
 $(OUTPUT)python/perf.so: $(PYTHON_EXT_SRCS) $(PYTHON_EXT_DEPS) $(LIBTRACEEVENT_DYNAMIC_LIST)
-	$(QUIET_GEN)CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS) $(LIBTRACEEVENT_DYNAMIC_LIST_LDFLAGS)' \
+	$(QUIET_GEN)LDSHARED="$(CC) -pthread -shared" \
+        CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS) $(LIBTRACEEVENT_DYNAMIC_LIST_LDFLAGS)' \
 	  $(PYTHON_WORD) util/setup.py \
 	  --quiet build_ext; \
 	mkdir -p $(OUTPUT)python && \