Add wxIsRunningUnderWine() helper function

This is mostly useful in the testing code to avoid failures when testing
for functionality not implemented by Wine.

include/wx/platinfo.h

@@ -429,6 +429,11 @@ protected:
     wxString m_cpuArch;
 };
 
-
+// Returns true only for MSW programs running under Wine.
+#ifdef __WINDOWS__
+WXDLLIMPEXP_BASE bool wxIsRunningUnderWine();
+#else // !__WINDOWS__
+inline bool wxIsRunningUnderWine() { return false; }
+#endif // __WINDOWS__/!__WINDOWS__
 
 #endif // _WX_PLATINFO_H_

interface/wx/platinfo.h

@@ -629,3 +629,16 @@ public:
 
     //@}
 };
+
+/**
+    Returns true only for MSW programs running under Wine.
+
+    This function can be used to check for some functionality not implemented
+    when using Wine.
+
+    @since 3.1.6
+
+    @library{wxbase}
+    @category{cfg}
+*/
+bool wxIsRunningUnderWine();

src/common/platinfo.cpp

@@ -29,6 +29,10 @@
 
 #include "wx/apptrait.h"
 
+#ifdef __WINDOWS__
+    #include "wx/dynlib.h"
+#endif
+
 // global object
 // VERY IMPORTANT: do not use the default constructor since it would
 //                 try to init the wxPlatformInfo instance using
@@ -373,3 +377,12 @@ wxEndianness wxPlatformInfo::GetEndianness(const wxString& end)
 
     return wxENDIAN_INVALID;
 }
+
+#ifdef __WINDOWS__
+
+bool wxIsRunningUnderWine()
+{
+    return wxLoadedDLL("ntdll.dll").HasSymbol(wxS("wine_get_version"));
+}
+
+#endif // __WINDOWS__