[libcxx] r340224 - Teach libc++ to use native NetBSD's max_align_t

[Kamil Rytarowski via cfe-commits]

Author: kamil
Date: Mon Aug 20 15:29:20 2018
New Revision: 340224

URL: http://llvm.org/viewvc/llvm-project?rev=340224&view=rev
Log:
Teach libc++ to use native NetBSD's max_align_t

Summary:
The NetBSD headers ship with max_align_t, that is not
compatible with the fallback version in libc++.

There is no defined a compiler specific symbol in the headers like:
 - __CLANG_MAX_ALIGN_T_DEFINED
 - _GCC_MAX_ALIGN_T
 - __DEFINED_max_align_t

Sponsored by <The NetBSD Foundation>

Reviewers: chandlerc, dlj, EricWF, joerg

Reviewed By: joerg

Subscribers: bsdjhb, llvm-commits, cfe-commits

Differential Revision: https://reviews.llvm.org/D47814

Modified:
    libcxx/trunk/include/cstddef
    libcxx/trunk/include/stddef.h

Modified: libcxx/trunk/include/cstddef
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/cstddef?rev=340224&r1=340223&r2=340224&view=diff
==============================================================================
--- libcxx/trunk/include/cstddef (original)
+++ libcxx/trunk/include/cstddef Mon Aug 20 15:29:20 2018
@@ -50,7 +50,7 @@ using ::ptrdiff_t;
 using ::size_t;
 
 #if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \
-    defined(__DEFINED_max_align_t)
+    defined(__DEFINED_max_align_t) || defined(__NetBSD__)
 // Re-use the compiler's <stddef.h> max_align_t where possible.
 using ::max_align_t;
 #else

Modified: libcxx/trunk/include/stddef.h
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/stddef.h?rev=340224&r1=340223&r2=340224&view=diff
==============================================================================
--- libcxx/trunk/include/stddef.h (original)
+++ libcxx/trunk/include/stddef.h Mon Aug 20 15:29:20 2018
@@ -54,7 +54,7 @@ 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) && \
-    !defined(__DEFINED_max_align_t)
+    !defined(__DEFINED_max_align_t) && !defined(__NetBSD__)
 typedef long double max_align_t;
 #endif