Minetest for C++11 (CMakeLists + Travis)

* Move GCC to GCC 6 & GCC 7
* Move Clang to Clang 3.6 & Clang 4.0
* LINT moves from Clang 3.9 to Clang 4.0
* Move XCode 7.3 to 8.0
* Use more travis tricks to install compilers instead of adding complexity to our build script
* Clang format fixes on checked files (compat Cpp11 instead of Cpp03)
* Mingw GCC update from 4.8.4 to 5.3 (Ubuntu Xenial)
* Drop mingw cmake generated files and add them to gitignore

src/CMakeLists.txt

@@ -708,7 +708,7 @@ include(CheckCXXCompilerFlag)
 
 if(MSVC)
 	# Visual Studio
-
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++11")
 	# EHa enables SEH exceptions (used for catching segfaults)
 	set(CMAKE_CXX_FLAGS_RELEASE "/EHa /Ox /GL /FD /MT /GS- /Zi /arch:SSE /fp:fast /D NDEBUG /D _HAS_ITERATOR_DEBUGGING=0 /TP")
 	#set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/LTCG /NODEFAULTLIB:\"libcmtd.lib\" /NODEFAULTLIB:\"libcmt.lib\"")
@@ -728,9 +728,10 @@ if(MSVC)
 	# /MT = Link statically with standard library stuff
 	set(CMAKE_C_FLAGS_RELEASE "/O2 /Ob2 /MT")
 else()
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 	# Probably GCC
 	if(APPLE)
-		SET( CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -pagezero_size 10000 -image_base 100000000" )
+		SET(CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -pagezero_size 10000 -image_base 100000000" )
 	endif()
 	if(WARN_ALL)
 		set(RELEASE_WARNING_FLAGS "-Wall")

src/database-dummy.h

@@ -40,6 +40,7 @@ public:
 
 	void beginSave() {}
 	void endSave() {}
+
 private:
 	std::map<s64, std::string> m_database;
 };

src/database-leveldb.h

@@ -41,6 +41,7 @@ public:
 
 	void beginSave() {}
 	void endSave() {}
+
 private:
 	leveldb::DB *m_database;
 };

src/environment.h

@@ -79,6 +79,7 @@ public:
 	u32 m_added_objects;
 
 	IGameDef *getGameDef() { return m_gamedef; }
+
 protected:
 	GenericAtomic<float> m_time_of_day_speed;
 

src/nameidmapping.h

@@ -80,6 +80,7 @@ public:
 		return true;
 	}
 	u16 size() const { return m_id_to_name.size(); }
+
 private:
 	UNORDERED_MAP<u16, std::string> m_id_to_name;
 	UNORDERED_MAP<std::string, u16> m_name_to_id;

src/script/lua_api/l_metadata.h

@@ -32,6 +32,7 @@ class MetaDataRef : public ModApiBase
 {
 public:
 	virtual ~MetaDataRef() {}
+
 protected:
 	static MetaDataRef *checkobject(lua_State *L, int narg);
 

src/touchscreengui.h

@@ -172,7 +172,7 @@ private:
 	IEventReceiver *m_receiver;
 	ISimpleTextureSource *m_texturesource;
 	v2u32 m_screensize;
-	std::map<int, rect<s32> > m_hud_rects;
+	std::map<int, rect<s32>> m_hud_rects;
 	std::map<int, irr::EKEY_CODE> m_hud_ids;
 	bool m_visible; // is the gui visible