linux-kernel - Re: [PATCH] tools: perf: fix linker error when libelf config is disabled

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Date:   Wed, 4 Jan 2017 15:45:37 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools: perf: fix linker error when libelf config is
 disabled

On Wed, Jan 04, 2017 at 01:52:40PM +0000, Sudeep Holla wrote:
> When libelf is disabled in the configuration, we get the following
> linker error:
>   LINK     libperf-jvmti.so
>   ld: cannot find -lelf
>   Makefile.perf:515: recipe for target 'libperf-jvmti.so' failed
> 
> This patch fixes the error by using the configuration macro EXTLIBS.
> 
> Fixes: d4dfdf00d43e ("perf jvmti: Plug compilation into perf build")
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  tools/perf/Makefile.perf | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 8fc24824705e..6defd9b00bc4 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -512,7 +512,7 @@ $(LIBJVMTI_IN): FORCE
>  	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=jvmti obj=jvmti
>  
>  $(OUTPUT)$(LIBJVMTI): $(LIBJVMTI_IN)
> -	$(QUIET_LINK)$(CC) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ $< -lelf -lrt
> +	$(QUIET_LINK)$(CC) -shared -Wl,-soname -Wl,$(LIBJVMTI) -o $@ $< $(EXTLIBS) -lrt
>  endif

hm, do we need -lelf -lrt at all? can't see reason for that

jirka