On Tue, 26 Aug 2025 at 18:31, Nathan Myers wrote: > --- a/libstdc++-v3/include/std/chrono > +++ b/libstdc++-v3/include/std/chrono > @@ -22,6 +22,8 @@ > // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see > // <http://www.gnu.org/licenses/>. > > +// [time] > + > /** @file include/chrono > * This is a Standard C++ Library header. > * @ingroup chrono > @@ -42,12 +44,16 @@ > # include <bits/c++0x_warning.h> > #else > > +#define __glibcxx_want_chrono > +#define __glibcxx_want_chrono_udls > +#include <bits/version.h> > + > #include <bits/chrono.h> > > -#if __cplusplus >= 202002L > +#if __cpp_lib_bitops >= 201907L > # include <bit> // __countr_zero > #endif > -#if __cplusplus >= 202002L && _GLIBCXX_HOSTED > +#if __cpp_lib_chrono >= 201803L && _GLIBCXX_HOSTED
N.B. this #if check is redundant here (but harmless). The src/c++20/clock.cc file is compiled with -std=gnu++20 so the feature test macro is defined, and is not compiled at all when --disable-libstdcxx-hosted is used, so it's always hosted. It doesn't hurt to keep the check though, for consistency with the declarations in the header.
