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Emit an error when mixing <stdatomic.h> and <atomic>
Atomics in C and C++ are incompatible at the moment and mixing the headers can result in confusing error messages. Emit an error explicitly telling about the incompatibility. Introduce the macro `__ALLOW_STDC_ATOMICS_IN_CXX__` that allows to choose in C++ between C atomics and C++ atomics. rdar://problem/27435938 Reviewers: rsmith, EricWF, mclow.lists Reviewed By: mclow.lists Subscribers: jkorous-apple, christof, bumblebritches57, JonChesterfield, smeenai, cfe-commits Differential Revision: https://reviews.llvm.org/D45470 llvm-svn: 331378
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