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? 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