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[Headers] Don't declare unreachable() from stddef.h in C++ #86748

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Apr 4, 2024
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[Headers] Don't declare unreachable() from stddef.h in C++ #86748

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4 changes: 4 additions & 0 deletions clang/lib/Headers/__stddef_unreachable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
*===-----------------------------------------------------------------------===
*/

#ifndef __cplusplus

/*
* When -fbuiltin-headers-in-system-modules is set this is a non-modular header
* and needs to behave as if it was textual.
Expand All @@ -15,3 +17,5 @@
(__has_feature(modules) && !__building_module(_Builtin_stddef))
#define unreachable() __builtin_unreachable()
#endif

#endif
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