[gcc r13-6546] libgomp.texi: Mention GCN_STACK_SIZE in Offload-Target Specifics

[Tobias Burnus]

https://gcc.gnu.org/g:2e3dd14dd287ca94b72c36ed28a1ae30887f77ce

commit r13-6546-g2e3dd14dd287ca94b72c36ed28a1ae30887f77ce
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Wed Mar 8 14:55:49 2023 +0100

    libgomp.texi: Mention GCN_STACK_SIZE in Offload-Target Specifics
    
    libgomp/ChangeLog:
    
            * libgomp.texi (Offload-Target Specifics): Mention GCN_STACK_SIZE.

Diff:
---
 libgomp/libgomp.texi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi
index 1b6358db4dc..5bcb84a1d6f 100644
--- a/libgomp/libgomp.texi
+++ b/libgomp/libgomp.texi
@@ -4461,6 +4461,8 @@ The implementation remark:
 @item OpenMP code that has a requires directive with @code{unified_address} or
       @code{unified_shared_memory} will remove any GCN device from the list of
       available devices (``host fallback'').
+@item The available stack size can be changed using the @code{GCN_STACK_SIZE}
+      environment variable; the default is 32 kiB per thread.
 @end itemize