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Date: Thu, 11 Jun 2015 16:19:36 +0900
From: Namhyung Kim <namhyung@kernel.org>
To: "Wangnan (F)" <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>, acme@kernel.org,
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Subject: Re: [RFC PATCH v6 24/32] perf record: Compile scriptlets if pass
 '.c' to --event
Message-ID: <20150611071936.GA11184@sejong>
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Hi Wang,

On Wed, Jun 10, 2015 at 08:06:17AM +0800, Wangnan (F) wrote:
> On 2015/6/10 5:48, Alexei Starovoitov wrote:
> >Once clang integration is complete. One can pull
> >upsteam llvm and clang and just use 'clang -O2 -c -march=bpf file.c'
> >
> 
> Good news, so llc part should be removed.
> 
> Next version I'd like to use following config options:
> 
> [llvm]
>     clang-bpf-cmd-template = "$CLANG_EXEC $CLANG_OPTIONS -c $CLANG_SOURCE
> -emit-llvm -O2 -o - | /path/to/llc -march=bpf -filetype=obj -o -"
>     clang-path = "/path/to/clang"
>     clang-opt = ""
> 
> And the default template should be:
> 
> $CLANG_EXEC $CLANG_OPTIONS -c "$CLANG_SOURCE" -emit-llvm -O2 -o -

Did you mean this?

  $CLANG_EXEC $CLANG_OPTIONS -O2 -c "$BPF_SOURCE" -march=bpf -o -

Thanks,
Namhyung


> 
> Then with environment variable tricks we make it work with popen.
> 
> By this way we can get rid of llc in perf side, and make it work even before
> clang
> integration is complete.
> 
> Thank you.