TeamHeptaMirrors/gcc
1
0
Fork 1
mirror of https://github.com/gcc-mirror/gcc.git synced 2026-05-06 14:59:39 +02:00
Code Issues Packages Projects Releases Wiki Activity

libstdc++: Disable __cpp_lib_reflection for old CXX ABI

Browse Source 
Reflection currently doesn't work with -D_GLIBCXX_USE_CXX11_ABI=0.
The problem is that std::meta::exception currently uses under the
hood std::string and std::u8string and those aren't constexpr in
the old ABI.
While those members are in the standard exposition-only and so
we could make it to work by writing a custom class template that
just remembers const char{,8_t} * and size_t, there shouldn't be
many people trying to use C++26 features with the ABI that isn't
even compatible with C++11.

2026-01-20  Jakub Jelinek  <jakub@redhat.com>

	* include/bits/version.def (reflection): Add cxx11abi = yes;.
	* include/bits/version.h: Regenerate.
This commit is contained in:
Jakub Jelinek
2026-01-20 12:01:07 +01:00
committed by Jakub Jelinek
parent bc09128cad
commit 23cd6f3bcb
2 changed files with 11 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
libstdc++-v3/include/bits/version.def
View File

@@ -2259,6 +2259,7 @@ ftms = {
v = 202506;
cxxmin = 26;
extra_cond = "__cpp_impl_reflection >= 202506L";
cxx11abi = yes;
};
};

20
libstdc++-v3/include/bits/version.h
View File

@@ -2526,6 +2526,16 @@
#endif /* !defined(__cpp_lib_philox_engine) */
#undef __glibcxx_want_philox_engine
#if !defined(__cpp_lib_reflection)
# if (__cplusplus > 202302L) && _GLIBCXX_USE_CXX11_ABI && (__cpp_impl_reflection >= 202506L)
# define __glibcxx_reflection 202506L
# if defined(__glibcxx_want_all) || defined(__glibcxx_want_reflection)
# define __cpp_lib_reflection 202506L
# endif
# endif
#endif /* !defined(__cpp_lib_reflection) */
#undef __glibcxx_want_reflection
#if !defined(__cpp_lib_is_implicit_lifetime)
# if (__cplusplus >= 202100L) && (__has_builtin(__builtin_is_implicit_lifetime))
# define __glibcxx_is_implicit_lifetime 202302L
@@ -2536,14 +2546,4 @@
#endif /* !defined(__cpp_lib_is_implicit_lifetime) */
#undef __glibcxx_want_is_implicit_lifetime
#if !defined(__cpp_lib_reflection)
# if (__cplusplus > 202302L) && (__cpp_impl_reflection >= 202506L)
# define __glibcxx_reflection 202506L
# if defined(__glibcxx_want_all) || defined(__glibcxx_want_reflection)
# define __cpp_lib_reflection 202506L
# endif
# endif
#endif /* !defined(__cpp_lib_reflection) */
#undef __glibcxx_want_reflection
#undef __glibcxx_want_all