From 73602f2a13765b5ea3c766c547b2fb088c950ed1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sun, 5 Oct 2025 00:23:51 +0200
Subject: [PATCH] std.Target: baseline model for s390x-zos should be arch10,
 not arch8

---
 lib/std/Target.zig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/std/Target.zig b/lib/std/Target.zig
index 83b6739747..5b16b07c8b 100644
--- a/lib/std/Target.zig
+++ b/lib/std/Target.zig
@@ -1912,7 +1912,11 @@ pub const Cpu = struct {
                 .powerpc64le => &powerpc.cpu.ppc64le,
                 .riscv32, .riscv32be => &riscv.cpu.baseline_rv32,
                 .riscv64, .riscv64be => &riscv.cpu.baseline_rv64,
-                .s390x => &s390x.cpu.arch8, // gcc/clang do not have a generic s390x model.
+                // gcc/clang do not have a generic s390x model.
+                .s390x => switch (os.tag) {
+                    .zos => &s390x.cpu.arch10,
+                    else => &s390x.cpu.arch8,
+                },
                 .sparc => &sparc.cpu.v9, // glibc does not work with 'plain' v8.
                 .sparc64 => switch (os.tag) {
                     .solaris => &sparc.cpu.ultrasparc3,