Bootstrapped and regtested on x86_64-pc-linux-gnu and aarch64-unknown-linux-gnu,
OK for trunk?

-- >8 --

This adds a new xtreme-header testcase to ensure that we have no
regressions with regards to exposures of TU-local declarations
in the standard library header files.

A more restrictive test would be to do 'export extern "C++"' here, but
unfortunately the system headers on some targets declare TU-local
entities, so we'll make do with checking that at least the C++ standard
library headers don't refer to such entities.

        PR c++/115126

gcc/testsuite/ChangeLog:

        * g++.dg/modules/xtreme-header-8.C: New test.

Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com>
---
 gcc/testsuite/g++.dg/modules/xtreme-header-8.C | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/modules/xtreme-header-8.C

diff --git a/gcc/testsuite/g++.dg/modules/xtreme-header-8.C 
b/gcc/testsuite/g++.dg/modules/xtreme-header-8.C
new file mode 100644
index 00000000000..9da4e01cc68
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/xtreme-header-8.C
@@ -0,0 +1,8 @@
+// PR c++/115126
+// { dg-additional-options "-fmodules-ts -Wignored-exposures" }
+// { dg-module-cmi xstd }
+
+export module xstd;
+extern "C++" {
+  #include "xtreme-header.h"
+}
-- 
2.46.0

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