CMakeLists enhancements

- compiler detection (clang and gcc version check)
 - compile flags only for src/ subdir
 - system and local include paths
 - fix for clang compilation

CMakeLists.txt

@@ -47,10 +47,27 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 
 # Global compile flags
-# These are specific to GCC/MinGW; for other compilers, change as necessary
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=c++11")
-set(CMAKE_CXX_FLAGS_RELEASE "-O2")
-set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
+# These are specific to GCC/MinGW/clang; for other compilers, change as necessary
+# The flags are used throughout src/ subdir
+set(COLOBOT_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=c++11")
+set(COLOBOT_CXX_FLAGS_RELEASE "-O2")
+set(COLOBOT_CXX_FLAGS_DEBUG "-g -O0")
+
+# Compiler detection
+if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+    execute_process(
+        COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
+    if (NOT (GCC_VERSION VERSION_GREATER 4.6 OR GCC_VERSION VERSION_EQUAL 4.6))
+        message(FATAL_ERROR "${PROJECT_NAME} requires GCC 4.6 or greater.")
+    else()
+        message(STATUS "Detected GCC version 4.6+")
+    endif()
+elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+    message(STATUS "Detected Clang compiler")
+else()
+    message(FATAL_ERROR "Your C++ compiler doesn't seem to support C++11.\n"
+                        "Supported compilers at this time are GCC 4.6+ and clang.")
+endif()
 
 # Asserts can be enabled/disabled regardless of build type
 option(ASSERTS "Enable assert()s" ON)

lib/gmock/CMakeLists.txt

@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 2.8)
 
+set(CMAKE_CXX_FLAGS "${${ORIGINAL_CXX_FLAGS}}")
+
 include_directories(. include ${GTEST_INCLUDE_DIR})
 
 # gmock-all.cc includes all other sources

src/CMakeLists.txt

@@ -1,7 +1,13 @@
-# CBot library is built separately
+# Compile flags as defined in global CMakeLists
+set(CMAKE_CXX_FLAGS ${COLOBOT_CXX_FLAGS})
+set(CMAKE_CXX_FLAGS_RELEASE ${COLOBOT_CXX_FLAGS_RELEASE})
+set(CMAKE_CXX_FLAGS_DEBUG ${COLOBOT_CXX_FLAGS_DEBUG})
+
+
+# Subdirectories
+
 add_subdirectory(CBot)
 
-# Tools directory is built separately
 add_subdirectory(tools)
 
 add_subdirectory(po)
@@ -196,10 +202,16 @@ ${OPTIONAL_LIBS}
 ${PLATFORM_LIBS}
 )
 
+# Local
 include_directories(
 .
 ..
 ${CMAKE_CURRENT_BINARY_DIR}
+)
+
+# System
+include_directories(
+SYSTEM
 ${SDL_INCLUDE_DIR}
 ${SDLIMAGE_INCLUDE_DIR}
 ${SDLTTF_INCLUDE_DIR}

src/graphics/engine/modelmanager.cpp

@@ -8,9 +8,9 @@
 
 #include <cstdio>
 
-namespace Gfx {
+template<> Gfx::CModelManager* CSingleton<Gfx::CModelManager>::mInstance = nullptr;
 
-template<> CModelManager* CSingleton<CModelManager>::mInstance = nullptr;
+namespace Gfx {
 
 CModelManager::CModelManager(CEngine* engine)
 {