[gcc r12-7504] libstdc++: Ensure __glibcxx_assert_fail has default visibility

[Jonathan Wakely]

https://gcc.gnu.org/g:d3a757af21ac330d438aaf5f97fa47d2efed11ea

commit r12-7504-gd3a757af21ac330d438aaf5f97fa47d2efed11ea
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Mar 4 18:23:10 2022 +0000

    libstdc++: Ensure __glibcxx_assert_fail has default visibility
    
    This ensures there's no linker error if libstdc++ headers are included
    following a pragma that sets hidden visibility.
    
    Similarly for std::__terminate, which is always-inline so shouldn't
    matter, but it's not wrong to do this anyway.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/c++config (__glibcxx_assert_fail): Add visibility
            attribute.
            (__terminate): Likewise.

Diff:
---
 libstdc++-v3/include/bits/c++config | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index c64b61b3c90..6c134f13509 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -305,6 +305,7 @@ namespace std
   // This allows the library to terminate without including all of <exception>
   // and without making the declaration of std::terminate visible to users.
   extern "C++" __attribute__ ((__noreturn__, __always_inline__))
+  _GLIBCXX_VISIBILITY(default)
   inline void __terminate() _GLIBCXX_USE_NOEXCEPT
   {
     void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
@@ -554,7 +555,7 @@ namespace std
 {
   // Avoid the use of assert, because we're trying to keep the <cassert>
   // include out of the mix.
-  extern "C++" _GLIBCXX_NORETURN
+  extern "C++" _GLIBCXX_NORETURN _GLIBCXX_VISIBILITY(default)
   void
   __glibcxx_assert_fail(const char* __file, int __line,
 			const char* __function, const char* __condition)