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From:   Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Date:   Wed, 6 Nov 2019 11:00:36 -0300
To:     John Garry <john.garry@huawei.com>
Cc:     peterz@infradead.org, mingo@redhat.com,
        alexander.shishkin@linux.intel.com, jolsa@redhat.com,
        namhyung@kernel.org, mark.rutland@arm.com,
        linux-kernel@vger.kernel.org, will@kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH] perf tools: Fix cross compile for ARM64
Message-ID: <20191106140036.GA6259@kernel.org>
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Em Wed, Nov 06, 2019 at 09:00:54PM +0800, John Garry escreveu:
> Currently when cross compiling perf tool for ARM64 on my x86 machine I get
> this error:
> arch/arm64/util/sym-handling.c:9:10: fatal error: gelf.h: No such file or directory
>  #include <gelf.h>
> 
> For the build, libelf is reported off:
> Auto-detecting system features:
> ...
> ...                        libelf: [ OFF ]

Thanks, applied.

- Arnaldo
 
> Indeed, test-libelf is not built successfully:
> more ./build/feature/test-libelf.make.output
> test-libelf.c:2:10: fatal error: libelf.h: No such file or directory
>  #include <libelf.h>
>           ^~~~~~~~~~
> compilation terminated.
> 
> I have no such problems natively compiling on ARM64, and I did not
> previously have this issue for cross compiling. Fix by relocating
> the gelf.h include.
> 
> Signed-off-by: John Garry <john.garry@huawei.com>
> ---
> 
> I marked this as RFC as I am suspicious that I have seen no other
> reports, and whether fixing up the libelf.h include issue is the proper
> approach.
> 
> diff --git a/tools/perf/arch/arm64/util/sym-handling.c b/tools/perf/arch/arm64/util/sym-handling.c
> index 5df788985130..8dfa3e5229f1 100644
> --- a/tools/perf/arch/arm64/util/sym-handling.c
> +++ b/tools/perf/arch/arm64/util/sym-handling.c
> @@ -6,9 +6,10 @@
>  
>  #include "symbol.h" // for the elf__needs_adjust_symbols() prototype
>  #include <stdbool.h>
> -#include <gelf.h>
>  
>  #ifdef HAVE_LIBELF_SUPPORT
> +#include <gelf.h>
> +
>  bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
>  {
>  	return ehdr.e_type == ET_EXEC ||
> -- 
> 2.17.1

-- 

- Arnaldo