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The epiphany-elf target aligns structs to 8 bytes, which causes the static_assert(alignof(_Chunk) == 1) to fail. Instead of requiring _Chunks to be positionable at any alignment, ensure new buffers are aligned to alignof(_Chunk). Because the buffer size is a power of two, we know that both the buffer size and sizeof(_Chunk) are multiples of alignof(_Chunk). So is p is aligned to alignof(_Chunk) then so is (p + size - sizeof(_Chunk)). So just ensure the new buffer is aligned to at least alignof(_Chunk), which should already be true because the caller requests at least alignof(max_align_t). PR libstdc++/90046 * src/c++17/memory_resource.cc (monotonic_buffer_resource::_Chunk::allocate): Increase alignment if needed to allow placing a _Chunk at the end of the buffer. (monotonic_buffer_resource::_M_new_buffer): Remove static_assert. From-SVN: r270291
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.