[google gcc-4.9] FDO build for linux kernel

[Xinliang David Li]

ok.

(the way to detect kernel build looks unpolished, but there does not
seem to be a consistent way of doing it. Some targets have kernel
specific flags ..)

On Thu, Nov 13, 2014 at 10:40 AM, Rong Xu <xur@google.com> wrote:
> Here is patch that ports our work on FDO linux kernel build support to
> gcc-4_9. With this patch, kernel will use the libgcov functions to
> dump the gcda files.
>
> This patch also enables LIPO build. But the module grouping is not
> computed online. We will use gcov-tool to do this offline.
>
> Tested with kernel FDO build, regression and google internal benchmarks.
>
> Thanks,
>
> -Rong