[libcxx] Fix detection of __is_final.
Summary: Currently we only enable the use of __is_final(...) with Clang. GCC also provides __is_final(...) since 4.7 in all standard modes. This patch creates the macro _LIBCPP_HAS_IS_FINAL to note the availability of `__is_final`.
Reviewers: danalbert, mclow.lists
Reviewed By: mclow.lists
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D8795
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@239664 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index 00efda2..9ab02e3 100644
--- a/include/__config
+++ b/include/__config
@@ -77,10 +77,8 @@
#ifdef _WIN32
# define _LIBCPP_LITTLE_ENDIAN 1
# define _LIBCPP_BIG_ENDIAN 0
-// Compiler intrinsics (GCC or MSVC)
-# if defined(__clang__) \
- || (defined(_MSC_VER) && _MSC_VER >= 1400) \
- || (defined(__GNUC__) && _GNUC_VER > 403)
+// Compiler intrinsics (MSVC)
+#if defined(_MSC_VER) && _MSC_VER >= 1400
# define _LIBCPP_HAS_IS_BASE_OF
# endif
# if defined(_MSC_VER) && !defined(__clang__)
@@ -95,12 +93,6 @@
# endif
#endif // _WIN32
-#ifdef __linux__
-# if defined(__GNUC__) && _GNUC_VER >= 403
-# define _LIBCPP_HAS_IS_BASE_OF
-# endif
-#endif
-
#ifdef __sun__
# include <sys/isa_defs.h>
# ifdef _LITTLE_ENDIAN
@@ -320,6 +312,10 @@
# define _LIBCPP_HAS_IS_BASE_OF
#endif
+#if __has_feature(is_final)
+# define _LIBCPP_HAS_IS_FINAL
+#endif
+
// Objective-C++ features (opt-in)
#if __has_feature(objc_arc)
#define _LIBCPP_HAS_OBJC_ARC
@@ -403,6 +399,11 @@
#if _GNUC_VER >= 407
#define _LIBCPP_UNDERLYING_TYPE(T) __underlying_type(T)
#define _LIBCPP_IS_LITERAL(T) __is_literal_type(T)
+#define _LIBCPP_HAS_IS_FINAL
+#endif
+
+#if defined(__GNUC__) && _GNUC_VER >= 403
+# define _LIBCPP_HAS_IS_BASE_OF
#endif
#if !__EXCEPTIONS
@@ -537,6 +538,7 @@
#define _LIBCPP_HAS_NO_NULLPTR
#define _LIBCPP_HAS_NO_UNICODE_CHARS
#define _LIBCPP_HAS_IS_BASE_OF
+#define _LIBCPP_HAS_IS_FINAL
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#if defined(_AIX)