From 46191b478ebcb6bc6831627526da44f04dfcd1be Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Thu, 18 Dec 2025 21:29:55 +0000
Subject: [PATCH] toolchain.eclass: default to -mtls-dialect=gnu2 with GCC 16
 on x86_64

Bug: https://gcc.gnu.org/PR120933
Signed-off-by: Sam James <sam@gentoo.org>
---
 eclass/toolchain.eclass | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 92e48b66979f8..aaf24c50426ba 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -1581,6 +1581,10 @@ toolchain_src_configure() {
 				--enable-__cxa_atexit
 				--enable-clocale=gnu
 			)
+
+			if [[ ${CTARGET} == *linux* ]] && tc_version_is_at_least 16.0.0_p20251214 ${PV} ; then
+				confgcc+=( --with-tls=gnu2 )
+			fi
 			;;
 		*-solaris*)
 			confgcc+=( --enable-__cxa_atexit )