################################################################################
#
# Compiler Settings
#
################################################################################

# Require and enable C++ 0x/11/14/17
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
message(STATUS "tomsfastmath pre-check compiler: C++${CMAKE_CXX_STANDARD} with CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ")

if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_COMPILER_IS_GNUCXX)
#    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wnarrowing -Werror ")
#    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -Wnarrowing -Wextra")
    set(CMAKE_CXX_FLAGS " -Werror -Wshadow -Wextra -Wall -fexceptions -fno-omit-frame-pointer -fno-rtti  -DUNICODE ${CMAKE_CXX_FLAGS} ")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
    include(CheckCXXCompilerFlag)
    if(NOT TOMSFASTMATH_DISABLE_LIBCXX)
        check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
        if(CXX_SUPPORTS_STDLIB)
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
            set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++")
            set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -stdlib=libc++")
            set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -stdlib=libc++")
        endif()
        set(TOMSFASTMATH_DISABLE_LIBCXX ${TOMSFASTMATH_DISABLE_LIBCXX} CACHE BOOL "Do not use libc++, if available." FORCE)
    endif()
    message(STATUS "tomsfastmath build: Disable linking libc++ - ${TOMSFASTMATH_DISABLE_LIBCXX}")
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
    string(REGEX REPLACE "[/-]W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    if (NOT (CMAKE_VERSION VERSION_LESS 3.6.0)) # Compiler features for Intel in CMake 3.6+
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Qstd=c++17")
    endif()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /QaxCORE-AVX2")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:precise")
    set(CMAKE_CXX_FLAGS_DEBUG   "${CMAKE_CXX_FLAGS_DEBUG}   /Od")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /O3")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Qipo")
elseif(MSVC)
    string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    if(MSVC_VERSION LESS 1900)
        message(FATAL_ERROR "tomsfastmath : Build requires C++17-compliant compiler")
    endif()
endif()

if(CMAKE_BUILD_TYPE MATCHES Debug)
    message(STATUS "tomsfastmath : Global compiler flags - ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG}")
elseif(CMAKE_BUILD_TYPE MATCHES RelWithDebInfo)
    message(STATUS "tomsfastmath : Global compiler flags - ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
elseif(CMAKE_BUILD_TYPE MATCHES Release)
    message(STATUS "tomsfastmath : Global compiler flags - ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE}")
endif()