Check _MSVC_LANG macro in addition to __cplusplus (MS VC)

Issue #314 (bdgwc).

MS VC defines __cplusplus to 199711L by default (unless /Zc:__cplusplus
is passed to the compiler).

* gc_cpp.cc [GC_NEW_DELETE_NEED_THROW && _MSVC_LANG>=201703]
(GC_DECL_NEW_THROW): Define to noexcept(false) instead of
throw(bad_alloc).
* gc_cpp.cc [!_MSC_VER && !__DMC__ || GC_NO_INLINE_STD_NEW]: Change
__cplusplus>201103 to __cplusplus>=201402.
* include/gc_cpp.h [!GC_NO_INLINE_STD_NEW && (_MSC_VER || __DMC__
|| (__BORLANDC__ || __CYGWIN__ || __CYGWIN32__ || __MINGW32__
|| __WATCOMC__) && !GC_BUILD && !GC_NOT_DLL)]: Likewise.
* gc_cpp.cc [(!_MSC_VER && !__DMC__ || GC_NO_INLINE_STD_NEW)
&& _MSVC_LANG>=201402] (delete(void*,size_t)): Define.
* gc_cpp.cc [(!_MSC_VER && !__DMC__ || GC_NO_INLINE_STD_NEW)
&& _MSVC_LANG>=201402 && GC_OPERATOR_NEW_ARRAY && !CPPCHECK]
(delete[](void*,size_t)): Likewise.
* include/gc_cpp.h [!GC_NO_INLINE_STD_NEW && (_MSC_VER || __DMC__
|| (__BORLANDC__ || __CYGWIN__ || __CYGWIN32__ || __MINGW32__
|| __WATCOMC__) && !GC_BUILD && !GC_NOT_DLL) && _MSVC_LANG>=201402]
(delete(void*,size_t)): Likewise.
* include/gc_cpp.h [!GC_NO_INLINE_STD_NEW && (_MSC_VER || __DMC__
|| (__BORLANDC__ || __CYGWIN__ || __CYGWIN32__ || __MINGW32__
|| __WATCOMC__) && !GC_BUILD && !GC_NOT_DLL) && _MSVC_LANG>=201402
&& GC_OPERATOR_NEW_ARRAY] (delete[](void*,size_t)): Likewise.
* include/gc_allocator.h [!GC_ATTR_EXPLICIT && _MSVC_LANG>=201103]
(GC_ATTR_EXPLICIT): Define to "explicit" instead of empty.
* tests/test_cpp.cc [!GC_ATTR_EXPLICIT && _MSVC_LANG>=201103]
(GC_ATTR_EXPLICIT): Likewise.
* include/gc_allocator.h [!GC_NOEXCEPT && _MSC_VER
&& !(_HAS_EXCEPTIONS && !_HAS_EXCEPTIONS) && _MSVC_LANG>=201103]
(GC_NOEXCEPT): Define to noexcept instead of throw().
* include/gc_cpp.h [!GC_NOEXCEPT && _MSC_VER && !(_HAS_EXCEPTIONS
&& !_HAS_EXCEPTIONS) && _MSVC_LANG>=201103] (GC_NOEXCEPT): Likewise.

1 files changed, 6 insertions, 6 deletions

diff --git a/gc_cpp.cc b/gc_cpp.cc
index cbcaf4cd..71f7c5f6 100644
--- a/gc_cpp.cc
+++ b/gc_cpp.cc
@@ -50,12 +50,12 @@ built-in "new" and "delete".
 # endif
 
 # ifdef GC_NEW_DELETE_NEED_THROW
-#   if __cplusplus < 201703L
-#     define GC_DECL_NEW_THROW throw(std::bad_alloc)
-#   else
-      // The "dynamic exception" syntax was deprecated in C++11
-      // and removed in C++17.
+#   if __cplusplus >= 201703L || _MSVC_LANG >= 201703L
+      // The "dynamic exception" syntax had been deprecated in C++11
+      // and was removed in C++17.
 #     define GC_DECL_NEW_THROW noexcept(false)
+#   else
+#     define GC_DECL_NEW_THROW throw(std::bad_alloc)
 #   endif
 # else
 #   define GC_DECL_NEW_THROW /* empty */
@@ -111,7 +111,7 @@ built-in "new" and "delete".
     }
 # endif // GC_OPERATOR_NEW_ARRAY
 
-# if __cplusplus > 201103L // C++14
+# if __cplusplus >= 201402L || _MSVC_LANG >= 201402L // C++14
     void operator delete(void* obj, size_t size) GC_NOEXCEPT {
       (void)size; // size is ignored
       GC_FREE(obj);