From f90205951c347763a76681724fe3f7907ce3559b Mon Sep 17 00:00:00 2001
From: ARATA Mizuki <minorinoki@gmail.com>
Date: Mon, 21 Sep 2015 23:45:51 +0900
Subject: [PATCH] Add macros to conditionally suppress clang warnings.

The added macros wxCLANG_WARNING_{SUPPRESS,RESTORE} are similar to
wxGCC_WARNING_{SUPPRESS,RESTORE}, but the `wxCLANG_' version will expand to
compiler pragmas only when the warning name is known to the compiler.

They use clang's __has_warning feature.
---
 include/wx/defs.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/wx/defs.h b/include/wx/defs.h
index 962def7d5b..ceba1f7d40 100644
--- a/include/wx/defs.h
+++ b/include/wx/defs.h
@@ -695,6 +695,29 @@ typedef short int WXTYPE;
 #   define wxGCC_WARNING_RESTORE(x)
 #endif
 
+/*
+   Macros to suppress and restore clang warning only when it is valid.
+
+   Example:
+        wxCLANG_WARNING_SUPPRESS(inconsistent-missing-override)
+        virtual wxClassInfo *GetClassInfo() const
+        wxCLANG_WARNING_RESTORE(inconsistent-missing-override)
+*/
+#if defined(__has_warning)
+#    define wxCLANG_HAS_WARNING(x) __has_warning(x) /* allow macro expansion for the warning name */
+#    define wxCLANG_IF_VALID_WARNING(x,y) \
+         wxCONCAT(wxCLANG_IF_VALID_WARNING_,wxCLANG_HAS_WARNING(wxSTRINGIZE(wxCONCAT(-W,x))))(y)
+#    define wxCLANG_IF_VALID_WARNING_0(x)
+#    define wxCLANG_IF_VALID_WARNING_1(x) x
+#    define wxCLANG_WARNING_SUPPRESS(x) \
+         wxCLANG_IF_VALID_WARNING(x,wxGCC_WARNING_SUPPRESS(x))
+#    define wxCLANG_WARNING_RESTORE(x) \
+         wxCLANG_IF_VALID_WARNING(x,wxGCC_WARNING_RESTORE(x))
+#else
+#    define wxCLANG_WARNING_SUPPRESS(x)
+#    define wxCLANG_WARNING_RESTORE(x)
+#endif
+
 /*
     Combination of the two variants above: should be used for deprecated
     functions which are defined inline and are used by wxWidgets itself.