[PATCH] D28478: Check for musl-libc's max_align_t in addition to other variants.

[David L. Jones via Phabricator via cfe-commits]

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


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