CMakeLists enhancements

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

1 files changed, 21 insertions, 4 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 339e633..7e19ba0 100644
--- a/CMakeLists.txt
+++ b/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)