linux-kernel - Re: [PATCH 4/5] tools: build: fix libiberty feature detection

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Date:	Mon, 12 Oct 2015 13:35:02 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Rabin Vincent <rabin.vincent@...s.com>
Cc:	Arnaldo Carvalho de Melo <acme@...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: [PATCH 4/5] tools: build: fix libiberty feature detection

On Sun, Sep 27, 2015 at 08:37:58PM +0200, Rabin Vincent wrote:
> Pass CFLAGS and LDFLAGS to the libiberty compile line to make the
> detection work when using a cross compiler.
> 
> Otherwise perf fails to link even though BFD is detected.
> 
> ...                        libbfd: [ on  ]
> 
>   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'

We have FEATURE_CHECK_CFLAGS/FEATURE_CHECK_LDFLAGS variables
to pass CFLAGS/LDFLAGS to feature detection build

Could you also be more specific on what is missing
to make the libiberty check compile?

thanks,
jirka

> ...
> 
> Signed-off-by: Rabin Vincent <rabin.vincent@...s.com>
> ---
>  tools/build/feature/Makefile |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index e43a297..cea04ce9 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -132,10 +132,10 @@ test-libbfd.bin:
>  	$(BUILD) -DPACKAGE='"perf"' -lbfd -lz -liberty -ldl
>  
>  test-liberty.bin:
> -	$(CC) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty
> +	$(CC) $(CFLAGS) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty
>  
>  test-liberty-z.bin:
> -	$(CC) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty -lz
> +	$(CC) $(CFLAGS) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty -lz
>  
>  test-cplus-demangle.bin:
>  	$(BUILD) -liberty
> -- 
> 1.7.10.4
> 
> --
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