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

Namhyung Kim
2015-06-11T07:31:34Z

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.