Linux: Fix crash due to unknown locale.

- Fixed a crash that would occur if wxWidgets couldn't determine the users locale.

Author: Danny Glover

platform/linux/Rtt_LinuxContext.cpp

@@ -272,7 +272,15 @@ namespace Rtt
 		// read build.settings
 		if (fProjectSettings->HasBuildSettings())
 		{
-			wxString localeName = wxLocale::GetLanguageInfo(wxLocale::GetSystemLanguage())->CanonicalName.Lower();
+			int systemLanguage = wxLocale::GetSystemLanguage();
+
+			// fallback to en_us if wx wasn't able to determine the system language
+			if (systemLanguage == wxLANGUAGE_UNKNOWN)
+			{
+				systemLanguage = wxLANGUAGE_ENGLISH_US;
+			}
+
+			wxString localeName = wxLocale::GetLanguageInfo(systemLanguage)->CanonicalName.Lower();
 			string langCode = localeName.ToStdString().substr(0, 2);
 			string countryCode = localeName.ToStdString().substr(3, 5);
 			int minWidth = fProjectSettings->GetMinWindowViewWidth();

platform/linux/Rtt_LinuxPlatform.cpp

@@ -574,7 +574,15 @@ namespace Rtt
 
 		// Fetch the requested preference value.
 		const char *resultPointer = "";
-		wxString localeName = wxLocale::GetLanguageInfo(wxLocale::GetSystemLanguage())->CanonicalName.Lower();
+		int systemLanguage = wxLocale::GetSystemLanguage();
+
+		// fallback to en_us if wx wasn't able to determine the system language
+		if (systemLanguage == wxLANGUAGE_UNKNOWN)
+		{
+			systemLanguage = wxLANGUAGE_ENGLISH_US;
+		}
+
+		wxString localeName = wxLocale::GetLanguageInfo(systemLanguage)->CanonicalName.Lower();
 
 		switch (category)
 		{

platform/linux/linux_rtt.project

@@ -1497,7 +1497,6 @@
         <Preprocessor Value="wxUSE_UNSAFE_WXSTRING_CONV"/>
         <Preprocessor Value="wxUSE_STD_CONTAINERS_COMPATIBLY"/>
         <Preprocessor Value="wxUSE_GLCANVAS"/>
-        <Preprocessor Value="_DEBUG"/>
         <Preprocessor Value="Rtt_LINUX_ENV"/>
         <Preprocessor Value="FT2_BUILD_LIBRARY"/>
         <Preprocessor Value="ALMIXER_COMPILE_WITHOUT_SDL"/>