From faaf0c6eaab04e65c40aa1d5b9ca6e319461a256 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 27 Mar 2016 21:20:43 +0000
Subject: [PATCH] Pull in r255683 from upstream libc++ trunk (by Eric
 Fiselier):

  [libcxx] Enable noexcept for GCC 4.6 and greater

  Summary:
  This patch allows GCC 4.6 and above to use `noexcept` as opposed to
  `throw()`.

  Is it an ABI safe change to suddenly switch on `noexcept`? I imagine
  it must be because it's disabled in w/ clang in C++03 but not C++11.

  Reviewers: danalbert, jroelofs, mclow.lists

  Subscribers: cfe-commits

  Differential Revision: http://reviews.llvm.org/D15516

This should fix errors from gcc 4.6 and higher when compiling llvm-cov
and/or other llvm tools.

Reported by:	bdrewery
---
 contrib/libc++/include/__config | 34 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/contrib/libc++/include/__config b/contrib/libc++/include/__config
index 051d12cc716f..fe9eec4d097f 100644
--- a/contrib/libc++/include/__config
+++ b/contrib/libc++/include/__config
@@ -364,14 +364,8 @@ typedef __char32_t char32_t;
 #endif
 #endif
 
-#if (__has_feature(cxx_noexcept))
-#  define _NOEXCEPT noexcept
-#  define _NOEXCEPT_(x) noexcept(x)
-#  define _NOEXCEPT_OR_FALSE(x) noexcept(x)
-#else
-#  define _NOEXCEPT throw()
-#  define _NOEXCEPT_(x)
-#  define _NOEXCEPT_OR_FALSE(x) false
+#if !(__has_feature(cxx_noexcept))
+#define _LIBCPP_HAS_NO_NOEXCEPT
 #endif
 
 #if __has_feature(underlying_type)
@@ -439,10 +433,6 @@ namespace std {
 #define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
 #endif
 
-#define _NOEXCEPT throw()
-#define _NOEXCEPT_(x)
-#define _NOEXCEPT_OR_FALSE(x) false
-
 #ifndef __GXX_EXPERIMENTAL_CXX0X__
 
 #define _LIBCPP_HAS_NO_ADVANCED_SFINAE
@@ -456,6 +446,7 @@ namespace std {
 #define _LIBCPP_HAS_NO_RVALUE_REFERENCES
 #define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
 #define _LIBCPP_HAS_NO_STRONG_ENUMS
+#define _LIBCPP_HAS_NO_NOEXCEPT
 
 #else  // __GXX_EXPERIMENTAL_CXX0X__
 
@@ -479,6 +470,7 @@ namespace std {
 #endif  // _GNUC_VER < 404
 
 #if _GNUC_VER < 406
+#define _LIBCPP_HAS_NO_NOEXCEPT
 #define _LIBCPP_HAS_NO_NULLPTR
 #endif
 
@@ -513,15 +505,14 @@ using namespace _LIBCPP_NAMESPACE __attribute__((__strong__));
 #define _LIBCPP_HAS_NO_UNICODE_CHARS
 #define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
 #define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#define _LIBCPP_HAS_NO_NOEXCEPT
 #define __alignof__ __alignof
 #define _LIBCPP_NORETURN __declspec(noreturn)
 #define _LIBCPP_UNUSED
 #define _ALIGNAS(x) __declspec(align(x))
 #define _LIBCPP_HAS_NO_VARIADICS
 
-#define _NOEXCEPT throw ()
-#define _NOEXCEPT_(x)
-#define _NOEXCEPT_OR_FALSE(x) false
+
 
 #define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {
 #define _LIBCPP_END_NAMESPACE_STD  }
@@ -541,14 +532,11 @@ namespace std {
 #define _LIBCPP_NORETURN __attribute__((noreturn))
 #define _LIBCPP_UNUSED
 
-#define _NOEXCEPT throw()
-#define _NOEXCEPT_(x)
-#define _NOEXCEPT_OR_FALSE(x) false
-
 #define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
 #define _LIBCPP_HAS_NO_ADVANCED_SFINAE
 #define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
 #define _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
+#define _LIBCPP_HAS_NO_NOEXCEPT
 #define _LIBCPP_HAS_NO_NULLPTR
 #define _LIBCPP_HAS_NO_UNICODE_CHARS
 #define _LIBCPP_HAS_IS_BASE_OF
@@ -572,6 +560,14 @@ namespace std {
 
 #endif // __clang__ || __GNUC__ || _MSC_VER || __IBMCPP__
 
+#ifndef _LIBCPP_HAS_NO_NOEXCEPT
+#  define _NOEXCEPT noexcept
+#  define _NOEXCEPT_(x) noexcept(x)
+#else
+#  define _NOEXCEPT throw()
+#  define _NOEXCEPT_(x)
+#endif
+
 #ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
 typedef unsigned short char16_t;
 typedef unsigned int   char32_t;