linux-kernel - Re: [PATCH 1/6] perf tools: Add -lutil in python lib list for broken python-config

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Date:	Mon, 11 Jan 2016 10:28:41 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, jolsa@...nel.org, namhyung@...nel.or,
	lizefan@...wei.com, pi3orama@....com, linux-kernel@...r.kernel.org,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 1/6] perf tools: Add -lutil in python lib list for broken
 python-config

On Fri, Jan 08, 2016 at 02:23:56PM +0000, Wang Nan wrote:
> On some system the perf-config is broken, causes link failure like this:
> 
>  /usr/lib64/python2.7/config/libpython2.7.a(posixmodule.o): In function `posix_forkpty':
>  /opt/wangnan/yocto-build/tmp-eglibc/work/x86_64-oe-linux/python/2.7.3-r0.3.1/Python-2.7.3/./Modules/posixmodule.c:3816: undefined reference to `forkpty'
>  /usr/lib64/python2.7/config/libpython2.7.a(posixmodule.o): In function `posix_openpty':
>  /opt/wangnan/yocto-build/tmp-eglibc/work/x86_64-oe-linux/python/2.7.3-r0.3.1/Python-2.7.3/./Modules/posixmodule.c:3756: undefined reference to `openpty'
>  collect2: error: ld returned 1 exit status
> make[1]: *** [/home/wangnan/kernel-hydrogen/tools/perf/out/perf] Error 1
> make: *** [all] Error 2
> 
>  $ python-config --libs
>  -lpthread -ldl -lpthread -lutil -lm -lpython2.7

so your 'python-config --libs' shows -lutil and you still get the build failure?

after your fix I can see double -lutil in PYTHON_EMBED_LIBADD,
which is probably not a problem but could be ommited I think

> 
> In this case a '-lutil' should be appended to -lpython2.7.
> 
> (I know we have --start-group and --end-group. I can see them in
> command line of collect2 by strace. However it doesn't work. Seems
> I have a broken environment?)

hum, how is this related to start/end -group options?

thanks,
jirka