[PATCH] libstdc++: Add C++2a synchronization support

[Jonathan Wakely]

On 21/11/20 17:04 +0000, Jonathan Wakely wrote:
>On 21/11/20 16:16 +0100, Andreas Schwab wrote:
>>In file included from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/shared_ptr_atomic.h:33,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/memory:78,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/stdc++.h:82,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/extc++.h:32,
>>                from /daten/aranym/gcc/gcc-20201121/libstdc++-v3/testsuite/17_intro/headers/c++2020/all_attributes.cc:37:
>>/daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_base.h: In member function 'void std::atomic_flag::wait(bool, std::memory_order) const':
>>/daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_base.h:239: error: no matching function for call to '__atomic_wait(const __atomic_flag_data_type*, bool&, std::atomic_flag::wait(bool, std::memory_order) const::<lambda()>)'
>>In file included from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_base.h:41,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/shared_ptr_atomic.h:33,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/memory:78,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/stdc++.h:82,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/extc++.h:32,
>>                from /daten/aranym/gcc/gcc-20201121/libstdc++-v3/testsuite/17_intro/headers/c++2020/all_attributes.cc:37:
>>/daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_wait.h:265: note: candidate: 'template<class _Tp, class _Pred> void std::__atomic_wait(const _Tp*, _Tp, _Pred)'
>>/daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_wait.h:265: note:   template argument deduction/substitution failed:
>>In file included from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/shared_ptr_atomic.h:33,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/memory:78,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/stdc++.h:82,
>>                from /daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/m68k-linux/bits/extc++.h:32,
>>                from /daten/aranym/gcc/gcc-20201121/libstdc++-v3/testsuite/17_intro/headers/c++2020/all_attributes.cc:37:
>>/daten/aranym/gcc/gcc-20201121/Build/m68k-linux/libstdc++-v3/include/bits/atomic_base.h:239: note:   deduced conflicting types for parameter '_Tp' ('unsigned char' and 'bool')
>
>I'm testing this.

I'm committing this instead, it's the same but also disables
29_atomics/atomic/wait_notify/generic.cc on non-linux targets.

Tested sparc-solaris2.11 and powerpc64le-linux.

There are still some timeouts on linux:

FAIL: 30_threads/latch/3.cc execution test
FAIL: 30_threads/semaphore/try_acquire_for.cc execution test


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