[gcc r14-4998] libstdc++: [_GLIBCXX_INLINE_VERSION] Provide handle_contract_violation symbol

[Francois Dumont]

https://gcc.gnu.org/g:5d1b723ceffd0211926942d5f9563af9052fe443

commit r14-4998-g5d1b723ceffd0211926942d5f9563af9052fe443
Author: François Dumont <fdumont@gcc.gnu.org>
Date:   Tue Sep 19 18:56:57 2023 +0200

    libstdc++: [_GLIBCXX_INLINE_VERSION] Provide handle_contract_violation symbol
    
    libstdc++-v3/ChangeLog:
    
            * src/experimental/contract.cc
            [_GLIBCXX_INLINE_VERSION](handle_contract_violation): Provide symbol
            without version namespace decoration for gcc.

Diff:
---
 libstdc++-v3/src/experimental/contract.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libstdc++-v3/src/experimental/contract.cc b/libstdc++-v3/src/experimental/contract.cc
index 504a6c041f17..d550b49c4eb4 100644
--- a/libstdc++-v3/src/experimental/contract.cc
+++ b/libstdc++-v3/src/experimental/contract.cc
@@ -67,3 +67,11 @@ handle_contract_violation (const std::experimental::contract_violation &violatio
   std::cerr << std::endl;
 #endif
 }
+
+#if _GLIBCXX_INLINE_VERSION
+// Provide symbol without version namespace decoration for gcc.
+extern "C" __attribute__ ((weak)) void
+_Z25handle_contract_violationRKNSt12experimental18contract_violationE
+(const std::experimental::contract_violation &violation)
+{ handle_contract_violation(violation); }
+#endif