linux-kernel - Re: [RFC PATCH v6 24/32] perf record: Compile scriptlets if pass '.c' to --event

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Message-ID: <20150611071936.GA11184@sejong>
Date:	Thu, 11 Jun 2015 16:19:36 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>, acme@...nel.org,
	brendan.d.gregg@...il.com, daniel@...earbox.net,
	masami.hiramatsu.pt@...achi.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, jolsa@...nel.org,
	dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, hekuang@...wei.com, xiakaixu@...wei.com,
	pi3orama@....com
Subject: Re: [RFC PATCH v6 24/32] perf record: Compile scriptlets if pass
 '.c' to --event

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.
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