include(CheckCXXCompilerFlag)

# C++11 support
CHECK_CXX_COMPILER_FLAG(-std=c++11 COMPILER_SUPPORTS_CXX11)
if(COMPILER_SUPPORTS_CXX11)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
else()
    CHECK_CXX_COMPILER_FLAG(-std=c++0x COMPILER_SUPPORTS_CXX0X)
    if(COMPILER_SUPPORTS_CXX0X)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    else()
        message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
    endif()
endif()

# Use openmp
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
set(CMAKE_EXE_LINKER_FLAGS "-fopenmp")

# optimization flags support
if(CMAKE_BUILD_TYPE MATCHES Release)
	set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG -O3")
	foreach(FLAG -march=native -mtune=native -funroll-loops)
		string(REGEX REPLACE -= _ FLAG_ID ${FLAG})
		string(TOUPPER ${FLAG_ID} FLAG_ID)
		CHECK_CXX_COMPILER_FLAG(${FLAG} COMPILER_SUPPORTS${FLAG_ID})
	    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${FLAG}")
	endforeach()
  # For OSX use clang
  if(APPLE)
	    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -mfpmath=sse -Wa,-q")
  endif()
else()
    add_definitions(-DCHECK_STRICTMOD)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb")
endif()