[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
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@255683 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index ec44f76..5b10a6d 100644
--- a/include/__config
+++ b/include/__config
@@ -401,14 +401,8 @@
#endif // __linux__
#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)
@@ -476,10 +470,6 @@
#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
@@ -493,6 +483,7 @@
#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__
@@ -516,6 +507,7 @@
#endif // _GNUC_VER < 404
#if _GNUC_VER < 406
+#define _LIBCPP_HAS_NO_NOEXCEPT
#define _LIBCPP_HAS_NO_NULLPTR
#endif
@@ -549,15 +541,14 @@
#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 }
@@ -577,14 +568,11 @@
#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
@@ -608,6 +596,14 @@
#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;
