Introjucer: added C++ standard as an option in linux makefiles

extras/Introjucer/Source/Project Saving/jucer_ProjectExport_Make.h

@@ -57,8 +57,19 @@ public:
     bool isLinux() const override                       { return true; }
     bool canCopeWithDuplicateFiles() override           { return false; }
 
-    void createExporterProperties (PropertyListBuilder&) override
+    Value getCppStandardValue()                         { return getSetting (Ids::cppLanguageStandard); }
+    String getCppStandardString() const                 { return settings[Ids::cppLanguageStandard]; }
+
+    void createExporterProperties (PropertyListBuilder& properties) override
     {
+        static const char* cppStandardNames[]  = { "C++03", "C++11", nullptr };
+        static const char* cppStandardValues[] = { "-std=c++03", "-std=c++11", nullptr };
+
+        properties.add (new ChoicePropertyComponent (getCppStandardValue(),
+                                                     "C++ standard to use",
+                                                     StringArray (cppStandardNames),
+                                                     Array<var>  (cppStandardValues)),
+                        "The C++ standard to specify in the makefile");
     }
 
     //==============================================================================
@@ -237,7 +248,14 @@ private:
             << (" "  + replacePreprocessorTokens (config, getExtraCompilerFlagsString())).trimEnd()
             << newLine;
 
-        out << "  CXXFLAGS += $(CFLAGS) -std=c++11" << newLine;
+        String cppStandardToUse (getCppStandardString());
+
+        if (cppStandardToUse.isEmpty())
+            cppStandardToUse = "-std=c++11";
+
+        out << "  CXXFLAGS += $(CFLAGS) "
+            << cppStandardToUse
+            << newLine;
 
         writeLinkerFlags (out, config);