dlj created this revision. dlj added a reviewer: mclow.lists. dlj added a subscriber: cfe-commits.
Libcxx will define its own max_align_t when it is not available. However, the availability checks today only check for Clang's definition and GCC's definition. In particular, it does not check for musl's definition, which is the same as GCC's but guarded with a different macro. https://reviews.llvm.org/D28478 Files: include/cstddef include/stddef.h Index: include/stddef.h =================================================================== --- include/stddef.h +++ include/stddef.h @@ -53,7 +53,8 @@ } // Re-use the compiler's <stddef.h> max_align_t where possible. -#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) +#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) && \ + !defined(__DEFINED_max_align_t) typedef long double max_align_t; #endif Index: include/cstddef =================================================================== --- include/cstddef +++ include/cstddef @@ -48,7 +48,8 @@ using ::ptrdiff_t; using ::size_t; -#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) +#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \ + defined(__DEFINED_max_align_t) // Re-use the compiler's <stddef.h> max_align_t where possible. using ::max_align_t; #else
Index: include/stddef.h =================================================================== --- include/stddef.h +++ include/stddef.h @@ -53,7 +53,8 @@ } // Re-use the compiler's <stddef.h> max_align_t where possible. -#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) +#if !defined(__CLANG_MAX_ALIGN_T_DEFINED) && !defined(_GCC_MAX_ALIGN_T) && \ + !defined(__DEFINED_max_align_t) typedef long double max_align_t; #endif Index: include/cstddef =================================================================== --- include/cstddef +++ include/cstddef @@ -48,7 +48,8 @@ using ::ptrdiff_t; using ::size_t; -#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) +#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \ + defined(__DEFINED_max_align_t) // Re-use the compiler's <stddef.h> max_align_t where possible. using ::max_align_t; #else
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