Made some small fixes for MinGW and for C++20 with GCC #8318
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Our use of constinit does not seem to work with GCC yet (see protocolbuffers#8310), so this commit disables it on GCC for now. This commit also updates mutex.h to work around the fact that MinGW's std::mutex apparently does not have a constexpr constructor. We already have this kind of workaround for MSVC, so we can just use the same workaround.
haberman
approved these changes
Feb 19, 2021
This was referenced Mar 7, 2021
This was referenced Mar 12, 2021
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Our use of constinit does not seem to work with GCC yet (see
#8310), so this
commit disables it on GCC for now.
This commit also updates mutex.h to work around the fact that MinGW's
std::mutex apparently does not have a constexpr constructor. We already
have this kind of workaround for MSVC, so we can just use the same
workaround.