#RPI2/RPI3 armv7 toolchain
set(RPI True)

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR armv7)
set(SCOL_INSTALL_PREFIX "RPI2")

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# cross-compiler
set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++)
set(CMAKE_LINKER arm-linux-gnueabihf-ld)
set(CMAKE_OBJCOPY arm-linux-gnueabihf-objcopy)

set(CMAKE_FIND_ROOT_PATH /usr/arm-linux-gnueabihf)
list(APPEND CMAKE_FIND_ROOT_PATH /usr/arm-linux-gnueabihf/lib /usr/arm-linux-gnueabihf/usr/lib /usr/lib/arm-linux-gnueabihf /opt/vc/lib/)
set(CMAKE_INCLUDE_PATH /usr/include/arm-linux-gnueabihf)

# Tell pkg-config to look for libraries
set(ENV{PKG_CONFIG_PATH} "/usr/lib/arm-linux-gnueabihf/pkgconfig")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH) 

# Todo add -mfpu=neon-vfpv4
#RPI 1 flags -mfpu=vfp -mfloat-abi=hard -march=armv6 -mtune=arm1176jzf-s
#RPI 2 flags -march=armv7-a -mfpu=neon-vfpv4 -mtune=cortex-a7
#RPI 3 flags -march=armv8-a -mfpu=crypto-neon-fp-armv8 -mtune=cortex-a53
set(CMAKE_C_FLAGS "-fPIC -pipe -marm -mthumb-interwork -march=armv7-a -mfpu=neon-vfpv4 -mtune=cortex-a7 -mabi=aapcs-linux -mfloat-abi=hard -funsafe-math-optimizations -fomit-frame-pointer -fsigned-char" CACHE STRING "Flags for Raspberry Pi 2")
set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "Flags for Raspberry Pi 2")
set(CMAKE_CXX_FLAGS_RELEASE "-O1 -DNDEBUG" CACHE STRING "c++ Release flags" )
set(CMAKE_C_FLAGS_RELEASE "-O1 -DNDEBUG" CACHE STRING "c Release flags" )
set(CMAKE_CXX_FLAGS_DEBUG "-Og -g -DDEBUG -D_DEBUG" CACHE STRING "c++ Debug flags" )
set(CMAKE_C_FLAGS_DEBUG "-Og -g -DDEBUG -D_DEBUG" CACHE STRING "c Debug flags" )

set(CMAKE_SKIP_RPATH 1)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--enable-new-dtags,-R,\\\$ORIGIN" CACHE STRING "Flags executables")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--enable-new-dtags,-R,\\\$ORIGIN" CACHE STRING "Flags shared")
set(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_STATIC_LIBRARY_SUFFIX} ${CMAKE_FIND_LIBRARY_SUFFIXES})

add_definitions(-DRPI -DRPI2 -D__ARM_PCS_VFP -fPIC)

# Find Python 3 interpreter
find_package(Python3 COMPONENTS Interpreter)

if(NOT Python3_FOUND)
    find_program(PYTHON_EXECUTABLE python3)
    if(NOT PYTHON_EXECUTABLE)
        message(FATAL_ERROR "Python3 not found. Please install Python3.")
    else()
        set(PYTHON_EXECUTABLE ${PYTHON_EXECUTABLE} CACHE PATH "Python executable" FORCE)
    endif()
else()
    set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE} CACHE PATH "Python executable" FORCE)
endif()