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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r11-10244] libstdc++: Fix feature test macros in <version> for freestanding Date: Wed, 7 Sep 2022 17:49:41 +0000 (GMT) [thread overview] Message-ID: <20220907174941.8D7F7384D18D@sourceware.org> (raw) https://gcc.gnu.org/g:6e83459072902d4cb94baeedffac30441091adf9 commit r11-10244-g6e83459072902d4cb94baeedffac30441091adf9 Author: Jonathan Wakely <jwakely@redhat.com> Date: Tue Mar 22 21:29:56 2022 +0000 libstdc++: Fix feature test macros in <version> for freestanding Some C++17 and C++20 feature test macros are only defined in <version> for hosted builds, even though the features are supported for freestanding. libstdc++-v3/ChangeLog: * include/std/version [!_GLIBCXX_HOSTED] (__cpp_lib_bit_cast): Define for freestanding. (__cpp_lib_string_contains): Do not define for freestanding. (__cpp_lib_to_underlying): Likewise. Diff: --- libstdc++-v3/include/std/version | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version index f35b9da2307..e86b94bf9dc 100644 --- a/libstdc++-v3/include/std/version +++ b/libstdc++-v3/include/std/version @@ -177,6 +177,9 @@ #define __cpp_lib_atomic_float 201711L #define __cpp_lib_atomic_ref 201806L #define __cpp_lib_atomic_value_initialization 201911L +#if __has_builtin(__builtin_bit_cast) +# define __cpp_lib_bit_cast 201806L +#endif #define __cpp_lib_bitops 201907L #define __cpp_lib_bounded_array_traits 201902L // __cpp_lib_char8_t is defined in <bits/c++config.h> @@ -209,9 +212,6 @@ # endif #endif #define __cpp_lib_bind_front 201907L -#if __has_builtin(__builtin_bit_cast) -# define __cpp_lib_bit_cast 201806L -#endif // FIXME: #define __cpp_lib_execution 201902L #define __cpp_lib_integer_comparison_functions 202002L #define __cpp_lib_constexpr_algorithms 201806L @@ -272,8 +272,10 @@ #if __cplusplus > 202002L // c++2b #define __cpp_lib_is_scoped_enum 202011L +#if _GLIBCXX_HOSTED #define __cpp_lib_string_contains 202011L #define __cpp_lib_to_underlying 202102L +#endif #endif // C++2b #endif // C++20 #endif // C++17
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