Tested x86_64-linux, and lightly tested on x86_64-w64-mingw32 too, where it fixes the linker error.
Pushed to trunk. Backports needed for 12, 13 and 14. -- >8 -- Commit r12-6266-g3633cc54284450 implemented P1328 for C++23, making std::type_info::operator== usable in constant expressions. For targets such as mingw-w64 where that function was not previously inline, making it constexpr required making it inline for C++23 and later. For statically linked programs this can result in multiple definition errors, because there's a non-inline definition in libstdc++.a as well. For those targets make it always_inline for C++23, so that there is no symbol generated for the inline definition, and the non-inline definition in libstdc++.a will be the only definition. libstdc++-v3/ChangeLog: PR libstdc++/110572 * libsupc++/typeinfo (type_info::operator==): Add always_inline attribute for targets where the ABI requries equality to be non-inline. * testsuite/18_support/type_info/110572.cc: New test. --- libstdc++-v3/libsupc++/typeinfo | 3 +++ libstdc++-v3/testsuite/18_support/type_info/110572.cc | 11 +++++++++++ 2 files changed, 14 insertions(+) create mode 100644 libstdc++-v3/testsuite/18_support/type_info/110572.cc diff --git a/libstdc++-v3/libsupc++/typeinfo b/libstdc++-v3/libsupc++/typeinfo index fcc3077d060..35e72bb18ee 100644 --- a/libstdc++-v3/libsupc++/typeinfo +++ b/libstdc++-v3/libsupc++/typeinfo @@ -188,6 +188,9 @@ namespace std #endif #if __GXX_TYPEINFO_EQUALITY_INLINE || __cplusplus > 202002L +# if ! __GXX_TYPEINFO_EQUALITY_INLINE + [[__gnu__::__always_inline__]] +# endif _GLIBCXX23_CONSTEXPR inline bool type_info::operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT { diff --git a/libstdc++-v3/testsuite/18_support/type_info/110572.cc b/libstdc++-v3/testsuite/18_support/type_info/110572.cc new file mode 100644 index 00000000000..64081879b77 --- /dev/null +++ b/libstdc++-v3/testsuite/18_support/type_info/110572.cc @@ -0,0 +1,11 @@ +// { dg-options "-static-libstdc++" } +// { dg-require-static-libstdcxx } +// { dg-require-cpp-feature-test __cpp_rtti } +// { dg-do link } + +#include <typeinfo> + +int main() +{ + return typeid(0) == typeid(0u); +} -- 2.45.1