From a717febf18626c421f1d0acb0c76239d2c06168b Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Tue, 11 Nov 2025 17:55:21 -0500
Subject: [PATCH] Make std::meta::exception::what consteval

This enables implementing CWG 3115.
---
 libstdc++-v3/include/std/meta | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/meta b/libstdc++-v3/include/std/meta
index 42f84148371..13c79358bc9 100644
--- a/libstdc++-v3/include/std/meta
+++ b/libstdc++-v3/include/std/meta
@@ -112,7 +112,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       exception& operator=(const exception&) = default;
       exception& operator=(exception&&) = default;
 
-      constexpr const char *what() const noexcept override
+      consteval const char *what() const noexcept override
       {
 	// If u8string is not empty and string is empty, conversion
 	// from UTF-8 to ordinary literal encoding failed.