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

[Jiri Olsa <jolsa@redhat.com>]

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@axis.com>

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

thanks,
jirka