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Check for musl-libc's max_align_t in addition to other variants. 

Summary:
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.

Reviewers: mclow.lists, EricWF

Reviewed By: EricWF

Subscribers: chandlerc, cfe-commits

Differential Revision: https://reviews.llvm.org/D28478

llvm-svn: 294683
This commit is contained in:
David L. Jones 2017-02-10 01:27:42 +00:00
parent 788b10ecbc
commit 4b22736222
2 changed files with 4 additions and 2 deletions
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3
libcxx/include/cstddef
View File

@ -48,7 +48,8 @@ _LIBCPP_BEGIN_NAMESPACE_STD
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

3
libcxx/include/stddef.h
View File

@ -53,7 +53,8 @@ using std::nullptr_t;
}
// 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