On Wed, Apr 21, 2021 at 3:08 PM Martin Liška <mli...@suse.cz> wrote:
>
> When -flto=jobserver is used and we cannot detect job server, then we can
> still fallbackto -flto=N mode.
>
> Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
>
> Ready to be installed?
I think this behavior needs to be documented - it falls back to a less
conservative (possibly system overloading) mode - which IMHO is
non-obvious and IMHO we shouldn't do.
Richard.
> Thanks,
> Martin
>
> gcc/ChangeLog:
>
> * lto-wrapper.c (run_gcc): When -flto=jobserver is used, but the
> makeserver cannot be detected, then use -flto=N fallback.
> ---
> gcc/lto-wrapper.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/lto-wrapper.c b/gcc/lto-wrapper.c
> index 03a5922f8ea..0b626d7c811 100644
> --- a/gcc/lto-wrapper.c
> +++ b/gcc/lto-wrapper.c
> @@ -1585,8 +1585,9 @@ run_gcc (unsigned argc, char *argv[])
> if (jobserver && jobserver_error != NULL)
> {
> warning (0, jobserver_error);
> - parallel = 0;
> + /* Fall back to auto parallelism. */
> jobserver = 0;
> + auto_parallel = 1;
> }
> else if (!jobserver && jobserver_error == NULL)
> {
> --
> 2.31.1
>
