From e6f6972b5f4711c110fa753c926df49415f230da Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 8 Oct 2021 14:45:23 +0100
Subject: [PATCH] libstdc++: Detect miscompilation of src/c++11/limits.cc

Add a #error directive to ensure that the definitions are not compiled
as C++17, which would prevent them being emitted.

libstdc++-v3/ChangeLog:

	PR libstdc++/98725
	* src/c++11/limits.cc: Fail if __cpp_inline_variables is
	defined.
---
 libstdc++-v3/src/c++11/limits.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libstdc++-v3/src/c++11/limits.cc b/libstdc++-v3/src/c++11/limits.cc
index 21d4427f10bf..585cb8c92db6 100644
--- a/libstdc++-v3/src/c++11/limits.cc
+++ b/libstdc++-v3/src/c++11/limits.cc
@@ -29,6 +29,10 @@
 // 18.2.1
 //
 
+#if __cpp_inline_variables
+# error This file must be compiled as C++11 or C++14
+#endif
+
 #include <limits>
 
 namespace std _GLIBCXX_VISIBILITY(default)
-- 
2.47.2