[gcc(refs/users/marxin/heads/document-flto=jobserver-fallback)] Document -flto=jobserver fallback.

[gcc(refs/users/marxin/heads/document-flto=jobserver-fallback)] Document -flto=jobserver fallback.

[Martin Liska]

https://gcc.gnu.org/g:b81f5288fc81256e63d44e00793e2732eb2a2d88

commit b81f5288fc81256e63d44e00793e2732eb2a2d88
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Apr 22 10:59:51 2021 +0200

    Document -flto=jobserver fallback.
    
    gcc/ChangeLog:
    
            * doc/invoke.texi: Document what happens when GCC can't detect
            make's job server with -flto=jobserver.

Diff:
---
 gcc/doc/invoke.texi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index e98b0962b9f..1cfff4c14a9 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -12340,6 +12340,9 @@ Use @option{-flto=auto} to use GNU make's job server, if available,
 or otherwise fall back to autodetection of the number of CPU threads
 present in your system.
 
+If you specify @option{-flto=jobserver} and make's job server can't be detected,
+then well fall back to the number of CPU threads present in your system.
+
 @item -flto-partition=@var{alg}
 @opindex flto-partition
 Specify the partitioning algorithm used by the link-time optimizer.