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The standard says that <coroutine> should be present for freestanding. That was intentionally left out of the initial implementation, but can be done without much trouble. The header should be moved to libsupc++ at some point in stage 1. The standard also says that <coroutine> defines a std::hash specialization, which was missing from our implementation. That's a problem for freestanding (see LWG 3653) so only do that for hosted. We can use concepts to constrain the __coroutine_traits_impl base class when compiled with concepts enabled. In a pure C++20 implementation we would not need that base class at all and could just use a constrained partial specialization of coroutine_traits. But the absence of the __coroutine_traits_impl<R, void> base would create an ABI difference between the non-standard C++14/C++17 support for coroutines and the same code compiled as C++20. If we drop support for <coroutine> pre-C++20 we should revisit this. libstdc++-v3/ChangeLog: PR libstdc++/103726 * include/Makefile.am: Install <coroutine> for freestanding. * include/Makefile.in: Regenerate. * include/std/coroutine: Adjust headers and preprocessor conditions. (__coroutine_traits_impl): Use concepts when available. [_GLIBCXX_HOSTED] (hash<coroutine_handle>): Define. |
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| c++tools | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
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| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libiberty | ||
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| libobjc | ||
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| libphobos | ||
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| MAINTAINERS | ||
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