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

[Wangnan (F)]

On 2015/6/11 15:19, Namhyung Kim wrote:
> 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 -

Thank you for this notice.

Now I'm trying this:

      "$CLANG_EXEC $CLANG_OPTIONS $KERNEL_INC_OPTIONS "
      "-Wno-unused-value -Wno-pointer-sign "
      "-working-directory $WORKING_DIR "
      " -c \"$CLANG_SOURCE\" -march=bpf -O2 -o -"

WORKING_DIR is appended because we will get relative include directory 
using the
Makefile trick.

> 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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