CMake: Add compiler checks and GCC version checks

CMakeLists.txt

@@ -14,6 +14,33 @@ endif(CMAKE_CONFIGURATION_TYPES)
 cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
 project(dfhack)
 
+macro(CHECK_GCC COMPILER_PATH)
+  execute_process(COMMAND ${COMPILER_PATH} -dumpversion OUTPUT_VARIABLE GCC_VERSION_OUT)
+  string(STRIP "${GCC_VERSION_OUT}" GCC_VERSION_OUT)
+  if (${GCC_VERSION_OUT} VERSION_LESS "4.5" OR ${GCC_VERSION_OUT} VERSION_GREATER "4.9.9")
+    message(SEND_ERROR "${COMPILER_PATH} version ${GCC_VERSION_OUT} cannot be used - use GCC 4.5 through 4.9")
+  endif()
+endmacro()
+
+if(UNIX)
+  if(CMAKE_COMPILER_IS_GNUCC)
+    CHECK_GCC(${CMAKE_C_COMPILER})
+  else()
+    message(SEND_ERROR "C compiler is not GCC")
+  endif()
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    CHECK_GCC(${CMAKE_CXX_COMPILER})
+  else()
+    message(SEND_ERROR "C++ compiler is not GCC")
+  endif()
+endif()
+
+if(WIN32)
+  if(NOT MSVC)
+    message(SEND_ERROR "MSVC 2010 is required")
+  endif()
+endif()
+
 if(MSVC)
 # disable C4819 code-page warning
 add_definitions( "/wd4819" )

library/CMakeLists.txt

@@ -298,7 +298,7 @@ SET_TARGET_PROPERTIES(dfhack  PROPERTIES DEBUG_POSTFIX "-debug" )
 IF(APPLE)
     SET(SDL_LIBRARY ${CMAKE_INSTALL_PREFIX}/libs/SDL.framework)
     IF(NOT EXISTS ${SDL_LIBRARY})
-        MESSAGE(FATAL_ERROR "SDL framework not found. Make sure CMAKE_INSTALL_PREFIX is specified and correct.")
+        MESSAGE(SEND_ERROR "SDL framework not found. Make sure CMAKE_INSTALL_PREFIX is specified and correct.")
     ENDIF()
     SET(CXX_LIBRARY ${CMAKE_INSTALL_PREFIX}/libs/libstdc++.6.dylib)
     SET(ZIP_LIBRARY /usr/lib/libz.dylib)