[gcc r16-6873] doc, VxWorks: Clean up VxWorks option documentation [PR122243]

[Sandra Loosemore]

https://gcc.gnu.org/g:5442b8a4b6cc643833d0f0659d2bbd9ae308dc97

commit r16-6873-g5442b8a4b6cc643833d0f0659d2bbd9ae308dc97
Author: Sandra Loosemore <sloosemore@baylibre.com>
Date:   Mon Jan 5 23:46:12 2026 +0000

    doc, VxWorks: Clean up VxWorks option documentation [PR122243]
    
    gcc/ChangeLog
            PR other/122243
            * doc/invoke.texi (Option Summary) <VxWorks Options>: Add -mvthreads.
            (VxWorks Options): Likewise.

Diff:
---
 gcc/doc/invoke.texi | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a95f4d2fb6d7..fb0b96118af9 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -1495,7 +1495,7 @@ See RS/6000 and PowerPC Options.
 -mpointer-size=@var{size}}
 
 @emph{VxWorks Options} (@ref{VxWorks Options})
-@gccoptlist{-mrtp  -msmp  -non-static  -Bstatic  -Bdynamic
+@gccoptlist{-mrtp  -msmp  -mvthreads  -non-static  -Bstatic  -Bdynamic
 -Xbind-lazy  -Xbind-now}
 
 @emph{x86 Options} (@ref{x86 Options})
@@ -35724,6 +35724,10 @@ than PowerPC, nor on VxWorks version 7 or later, in which the selection
 is part of the VxWorks build configuration and the library paths are the
 same for either choice.
 
+@opindex mvthreads
+@item -mvthreads
+Link against the VxWorks AE vThread runtime environment.
+
 @opindex non-static
 @item -non-static
 Link an RTP executable against shared libraries rather than static