commit cbdd0896d3629a17d11be4078347e085b26099f5
author Howard Hinnant <hhinnant@apple.com> Thu May 31 19:31:14 2012 +0000
committer Howard Hinnant <hhinnant@apple.com> Thu May 31 19:31:14 2012 +0000
tree eef83a965012366362606a2ea33a14dc0e56bf57
parent 635ce1d127b617ae194b8aef03f52e810a6b6eff

Protect use of alignas against older versions of clang

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@157764 91177308-0d34-0410-b5e6-96231b3b80d8

include/__config

diff --git a/include/__config b/include/__config
index 7cd01dc..c104a3f 100644
--- a/include/__config
+++ b/include/__config
@@ -145,8 +145,10 @@
 #if defined(__clang__)
 
 #if __has_feature(cxx_alignas)
+#  define _ALIGNAS_TYPE(x) alignas(x)
 #  define _ALIGNAS(x) alignas(x)
 #else
+#  define _ALIGNAS_TYPE(x) __attribute__((__aligned__))
 #  define _ALIGNAS(x) __attribute__((__aligned__(x)))
 #endif
 

src/iostream.cpp

diff --git a/src/iostream.cpp b/src/iostream.cpp
index bfb1bfb..f5b959b 100644
--- a/src/iostream.cpp
+++ b/src/iostream.cpp
@@ -13,21 +13,21 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-alignas (__stdinbuf<char> ) static char __cin [sizeof(__stdinbuf <char>)];
-alignas (__stdoutbuf<char>) static char __cout[sizeof(__stdoutbuf<char>)];
-alignas (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
-alignas (__stdinbuf<wchar_t> ) static char __wcin [sizeof(__stdinbuf <wchar_t>)];
-alignas (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
-alignas (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
+_ALIGNAS_TYPE (__stdinbuf<char> ) static char __cin [sizeof(__stdinbuf <char>)];
+_ALIGNAS_TYPE (__stdoutbuf<char>) static char __cout[sizeof(__stdoutbuf<char>)];
+_ALIGNAS_TYPE (__stdoutbuf<char>) static char __cerr[sizeof(__stdoutbuf<char>)];
+_ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin [sizeof(__stdinbuf <wchar_t>)];
+_ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
+_ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];
 
-alignas (istream) char cin [sizeof(istream)];
-alignas (ostream) char cout[sizeof(ostream)];
-alignas (ostream) char cerr[sizeof(ostream)];
-alignas (ostream) char clog[sizeof(ostream)];
-alignas (wistream) char wcin [sizeof(wistream)];
-alignas (wostream) char wcout[sizeof(wostream)];
-alignas (wostream) char wcerr[sizeof(wostream)];
-alignas (wostream) char wclog[sizeof(wostream)];
+_ALIGNAS_TYPE (istream) char cin [sizeof(istream)];
+_ALIGNAS_TYPE (ostream) char cout[sizeof(ostream)];
+_ALIGNAS_TYPE (ostream) char cerr[sizeof(ostream)];
+_ALIGNAS_TYPE (ostream) char clog[sizeof(ostream)];
+_ALIGNAS_TYPE (wistream) char wcin [sizeof(wistream)];
+_ALIGNAS_TYPE (wostream) char wcout[sizeof(wostream)];
+_ALIGNAS_TYPE (wostream) char wcerr[sizeof(wostream)];
+_ALIGNAS_TYPE (wostream) char wclog[sizeof(wostream)];
 
 ios_base::Init __start_std_streams;