Import libc++ trunk r165949. Among other improvements and bug fixes,

this has many visibility problems fixed, which should help with
compiling certain ports that exercise C++11 mode (i.e. Firefox).

Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
which are referred to in all the source files.

MFC after:	1 month

1 files changed, 10 insertions, 5 deletions

diff --git a/contrib/libc++/src/stdexcept.cpp b/contrib/libc++/src/stdexcept.cpp
index 9fa4f59..660ebfe 100644
--- a/contrib/libc++/src/stdexcept.cpp
+++ b/contrib/libc++/src/stdexcept.cpp
@@ -16,8 +16,13 @@
 #include <cstddef>
 #include "system_error"
 
-// Use <cxxabi.h> to determine whether we're linking against libc++abi.
-#if __has_include(<cxxabi.h>)
+#ifndef __has_include
+#define __has_include(inc) 0
+#endif
+
+#if __APPLE__
+#include <cxxabi.h>
+#elif defined(LIBCXXRT) || __has_include(<cxxabi.h>)
 #include <cxxabi.h>
 #endif
 
@@ -34,7 +39,7 @@ private:
     const char* str_;
 
     typedef std::size_t unused_t;
-    typedef std::int32_t count_t;
+    typedef std::ptrdiff_t count_t;
 
     static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(2*sizeof(unused_t) +
                                                                        sizeof(count_t));
@@ -72,7 +77,7 @@ __libcpp_nmstr::operator=(const __libcpp_nmstr& s)
     const char* p = str_;
     str_ = s.str_;
     __sync_add_and_fetch(&count(), 1);
-    if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), -1) < 0)
+    if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), count_t(-1)) < 0)
         delete [] (p-offset);
     return *this;
 }
@@ -80,7 +85,7 @@ __libcpp_nmstr::operator=(const __libcpp_nmstr& s)
 inline
 __libcpp_nmstr::~__libcpp_nmstr()
 {
-    if (__sync_add_and_fetch(&count(), -1) < 0)
+    if (__sync_add_and_fetch(&count(), count_t(-1)) < 0)
         delete [] (str_ - offset);
 }