[5.5] Headers: exclude #include_next <stdatomic.h> on MSVC
#3811
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The 14.31.30818 toolset has the following in the `stdatomic.h`: ~~~ #ifndef __cplusplus #error <stdatomic.h> is not yet supported when compiling as C, but this is planned for a future release. #endif ~~~ This results in clang failing to build existing code which relied on `stdatomic.h` in C mode on Windows. Simply fallback to the clang header until that header is available as a complete implementation. (cherry picked from commit 1ad7de9) (cherry picked from commit 74483fb)
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@swift-ci please test |
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Backporting this from stable/20210726 to aid with builds with the newer MSVC toolset which prevents the inclusion of the MSVC atomic.h |
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CC: @shahmishal |
compnerd
changed the title
#include_next <stdatomic.h> on MSVC#include_next <stdatomic.h> on MSVC
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The 14.31.30818 toolset has the following in the
stdatomic.h:This results in clang failing to build existing code which relied on
stdatomic.hin C mode on Windows. Simply fallback to the clang headeruntil that header is available as a complete implementation.
(cherry picked from commit 1ad7de9)
(cherry picked from commit 74483fb)