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Date: Thu, 11 Jun 2015 15:35:55 +0800
From: "Wangnan (F)" <wangnan0@huawei.com>
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To: Namhyung Kim <namhyung@kernel.org>
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
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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.