linux-kernel - Re: [PATCHv2 2/3] tools: build: fix libiberty feature detection

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Message-ID: <20151029204511.GA12291@krava.redhat.com>
Date:	Thu, 29 Oct 2015 21:45:11 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Rabin Vincent <rabin.vincent@...s.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>, jolsa@...nel.org,
	namhyung@...nel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Rabin Vincent <rabinv@...s.com>
Subject: Re: [PATCHv2 2/3] tools: build: fix libiberty feature detection

On Thu, Oct 29, 2015 at 08:49:37AM +0100, Rabin Vincent wrote:
> Any CFLAGS or LDFLAGS set by the user need to be passed to the feature build
> command.  This many include for example -I or -L to point to libraries and
> include files in custom paths.
> 
> In most of the test-*.bin rules in build/feature/Makefile, we use the BUILD
> macro which always sends in CFLAGS and LDFLAGS.  The libiberty build line
> however doesn't use the BUILD macro and thus needs to send in CFLAGS and
> LDFLAGS explicitly.  Without this, when using custom CFLAGS/LDFLAGS, libiberty
> fails to be detected and the perf link fails with something like:
> 
>   LINK     perf
>  libbfd.a(bfd.o): In function `bfd_errmsg':
>  bfd.c:(.text+0x168): undefined reference to `xstrerror'
>  bbfd.a(opncls.o): In function `_bfd_new_bfd':
>  opncls.c:(.text+0xe8): undefined reference to `objalloc_create'
>  ...
> 
> Signed-off-by: Rabin Vincent <rabin.vincent@...s.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka
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