def cxx_poky_gxx63_armv7(conf):
    """
    Detect and setup the g++ 6.3 cross compiler for the
    Yocto based Poky distribution.
    """

    conf.mkspec_gxx_configure(
        major=6, minor=3, prefix='arm-poky-linux-gnueabi')

    # Note: A static version of libstdc++ is not available in the
    # poky SDK so we cannot use -static-libstdc++ for statically
    # linking.

    flags = ['-march=armv7-a', '-marm', '-mfpu=neon',
             '-mfloat-abi=hard', '-mcpu=cortex-a9']

    if conf.has_tool_option('poky_sdk_path'):
        sdk_path = conf.get_tool_option('poky_sdk_path')

        sysroot = os.path.join(
            sdk_path, 'sysroots', 'cortexa9hf-neon-poky-linux-gnueabi')

        flags.append('--sysroot=%s' % sysroot)

    conf.env['LINKFLAGS'] += flags
    conf.env['CXXFLAGS'] += flags

    # Set the target CPU
    conf.env['DEST_CPU'] = 'arm'

def cxx_gxx63_armv7_softfp(conf):
    """
    Detect and setup the g++ 6.3 cross-compiler for ARM Linux running on ARMv7
    CPU with a hardware FPU, but on a system where a soft-float ABI is required.
    The 'g++-arm-linux-gnueabi' Debian package should provide a compatible
    toolchain, or the standalone version can be  downloaded from the Linaro
    releases:
    https://releases.linaro.org/components/toolchain/binaries/latest/arm-linux-gnueabi/
    """
    conf.mkspec_gxx_configure(6, 3, 'arm-linux-gnueabi')
    # Specify the ARMv7 architecture and the 'softfp' float ABI to compile for
    # hardware FPU, but with software linkage (required for -mfpu=neon flag).
    # The __ARM_NEON__ macro will be defined only if the -mfloat-abi=softfp and
    # -mfpu=neon flags are used together.
    flags = ['-march=armv7-a', '-mfloat-abi=softfp']
    conf.env['CFLAGS'] += flags
    conf.env['CXXFLAGS'] += flags
    # Specify the ARMv7 architecture in the LINKFLAGS to link with the
    # atomic support that is required for std::threads (without this flag,
    # the threading code might call pure virtual methods)
    conf.env['LINKFLAGS'] += ['-march=armv7-a']
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']
    # Set the target CPU
    conf.env['DEST_CPU'] = 'arm'

def cxx_crosslinux_gxx47_mips(conf):
    """
    Detect and setup the g++ 4.7 cross-compiler for MIPS 32-bit Linux
    """
    conf.mkspec_gxx_configure(4, 7, 'crosslinux-gxx47-mips')
    # Statically link in the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']

def cxx_openwrt_gxx53_mips(conf):
    """
    Detect and setup the g++ 5.3 cross-compiler for OpenWRT MIPS
    """
    conf.mkspec_gxx_configure(5, 3, 'mips-openwrt-linux')
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']

def cxx_crosslinux_gxx46_x86(conf):
    """
    Detect and setup the g++ 4.6 cross-compiler for 32-bit Linux
    """
    conf.mkspec_gxx_configure(4, 6, 'crosslinux-gxx46-x86')
    conf.mkspec_add_common_flag('-m32')
    # Note: libstdc++ might not be available on the target platform
    # Statically link the GCC runtime and the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libgcc', '-static-libstdc++']

def cxx_raspberry_gxx49_arm(conf):
    """
    Detect and setup the g++ 4.9 cross-compiler for Raspberry Pi (Linux)
    """
    conf.mkspec_gxx_configure(4, 9, 'raspberry-gxx49-arm')
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']
    # Set the target CPU
    conf.env['DEST_CPU'] = 'arm'

def cxx_crosslinux_gxx47_arm(conf):
    """
    Detect and setup the g++ 4.7 cross-compiler for ARM 32-bit Linux
    """
    conf.mkspec_gxx_configure(4, 7, 'arm-openwrt-linux')
    # Note: libstdc++ might not be available on the target platform
    # Statically link the GCC runtime and the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libgcc', '-static-libstdc++']
    # The GCC runtime does not contain the C++ exception handling functions,
    # so libgcc_eh.a should also be statically linked
    conf.env['STLIB'] += ['gcc_eh']

def cxx_openwrt_gxx73_mips(conf):
    """
    Detect and setup the g++ 7.3 cross-compiler for OpenWRT MIPS
    """
    conf.mkspec_gxx_configure(7, 3, 'mips-openwrt-linux')
    # Enable atomic support (without these flags, the linker might have
    # undefined references to atomic functions)
    conf.env['LINKFLAGS'] += ['-latomic']
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']

def cxx_raspberry_gxx49_armv7(conf):
    """
    Detect and setup the g++ 4.9 cross-compiler for Raspberry Pi (Linux)
    running on ARMv7 compatible hardware (Raspberry Pi 2)
    """
    conf.mkspec_gxx_configure(4, 9, 'raspberry-gxx49-arm')
    # atomic support that is required for std::threads (without this flag,
    # the threading code might call pure virtual methods)
    conf.env['LINKFLAGS'] += ['-march=armv7-a']
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']
    # Set the target CPU
    conf.env['DEST_CPU'] = 'arm'

def mkspec_setup_gcov(conf, major, minor, minimum=False):
    """
    Setup g++ for coverage analysis with gcov
    """
    # Don't add any optimization flags (these might lead to incorrect results)
    conf.env['MKSPEC_DISABLE_OPTIMIZATION'] = True

    conf.mkspec_gxx_configure(major, minor, minimum=minimum)

    # Set flag to compile and link code instrumented for coverage analysis
    conf.mkspec_add_common_flag('--coverage')

    # Add flags to disable optimization and all function inlining
    flags = ['-O0', '-fPIC', '-fno-inline', '-fno-inline-small-functions',
             '-fno-default-inline']
    conf.env['CFLAGS'] += flags
    conf.env['CXXFLAGS'] += flags

def cxx_gxx63_armv7(conf):
    """
    Detect and setup the g++ 6.3 cross-compiler for ARM Linux running on ARMv7
    CPU with a hardware FPU. The 'g++-arm-linux-gnueabihf' Debian package
    should provide a compatible toolchain, or the standalone version can be
    downloaded from the Linaro releases:
    https://releases.linaro.org/components/toolchain/binaries/latest/arm-linux-gnueabihf/
    """
    conf.mkspec_gxx_configure(6, 3, 'arm-linux-gnueabihf')
    # Specify the ARMv7 architecture in the LINKFLAGS to link with the
    # atomic support that is required for std::threads (without this flag,
    # the threading code might call pure virtual methods)
    conf.env['LINKFLAGS'] += ['-march=armv7-a']
    # Note: libstdc++ might not be available on the target platform
    # Statically link with the C++ standard library
    conf.env['LINKFLAGS'] += ['-static-libstdc++']
    # Set the target CPU
    conf.env['DEST_CPU'] = 'arm'

def cxx_gxx54_x86(conf):
    """
    Detect and setup the g++ 5.4 compiler for 32 bit
    """
    conf.mkspec_gxx_configure(5, 4)
    conf.mkspec_add_common_flag('-m32')

def cxx_gxx83_x86(conf):
    """
    Detect and setup the g++ 8.3 compiler for 32 bit
    """
    conf.mkspec_gxx_configure(8, 3)
    conf.mkspec_add_common_flag('-m32')

def cxx_gxx82_x64(conf):
    """
    Detect and setup the g++ 8.2 compiler for 64 bit
    """
    conf.mkspec_gxx_configure(8, 2)
    conf.mkspec_add_common_flag('-m64')

def cxx_gxx73_x64(conf):
    """
    Detect and setup the g++ 7.3 compiler for 64 bit
    """
    conf.mkspec_gxx_configure(7, 3)
    conf.mkspec_add_common_flag('-m64')

def cxx_gxx72_x86(conf):
    """
    Detect and setup the g++ 7.2 compiler for 32 bit
    """
    conf.mkspec_gxx_configure(7, 2)
    conf.mkspec_add_common_flag('-m32')

def cxx_raspberry_gxx47_arm(conf):
    """
    Detect and setup the g++ 4.7 cross-compiler for Raspberry Pi (Linux)
    """
    conf.mkspec_gxx_configure(4, 7, 'raspberry-gxx47-arm')

def cxx_gxx49_x86(conf):
    """
    Detect and setup the g++ 4.9 compiler for 32 bit
    """
    conf.mkspec_gxx_configure(4, 9)
    conf.mkspec_add_common_flag('-m32')

def cxx_gxx60_x64(conf):
    """
    Detect and setup the g++ 6.0 compiler for 64 bit
    """
    conf.mkspec_gxx_configure(6, 0)
    conf.mkspec_add_common_flag('-m64')

def cxx_gxx61_x86(conf):
    """
    Detect and setup the g++ 6.1 compiler for 32 bit
    """
    conf.mkspec_gxx_configure(6, 1)
    conf.mkspec_add_common_flag('-m32')