Make the constexpr mutex constructor opt-in #4000
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CaseyCarter
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... via defining `_ENABLE_CONSTEXPR_MUTEX_CONSTRUCTOR`, instead of opt-out via `_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR`. This avoids potential breakage until we can update the VCLibs UWP framework libraries.
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constexpr mutex constructor" changes
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strega-nil-ms
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CaseyCarter
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This reverts commit 782dcd5.
CaseyCarter
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This reverts commit 782dcd5. Fixes microsoft#4338
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microsoft/STL#3824 microsoft/STL#4000 microsoft/STL#4339 Add escape hatch due to STL change resulting in issues with binary compatibility. https://github.com/microsoft/STL/wiki/Changelog "Fixed bugs: Fixed mutex's constructor to be constexpr. #3824 #4000 #4339 Note: Programs that aren't following the documented restrictions on binary compatibility may encounter null dereferences in mutex machinery. You must follow this rule: When you mix binaries built by different supported versions of the toolset, the Redistributable version must be at least as new as the latest toolset used by any app component. You can define _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR as an escape hatch."
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STL updates Mutex Fix microsoft/STL#3824 microsoft/STL#4000 microsoft/STL#4339 Add escape hatch due to STL change resulting in issues with binary compatibility. https://github.com/microsoft/STL/wiki/Changelog "Fixed bugs: Fixed mutex's constructor to be constexpr. #3824 #4000 #4339 Note: Programs that aren't following the documented restrictions on binary compatibility may encounter null dereferences in mutex machinery. You must follow this rule: When you mix binaries built by different supported versions of the toolset, the Redistributable version must be at least as new as the latest toolset used by any app component. You can define _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR as an escape hatch."**Description**
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... via defining
_ENABLE_CONSTEXPR_MUTEX_CONSTRUCTOR, instead of opt-out via_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR. This avoids potential breakage until we can update the VCLibs UWP framework libraries. Doing so in time for 17.8 is probably impossible at this late stage; we'll get this straightened out and enabled by default for 17.9.