import os

# toolchains options
ARCH='arm'
CPU='vexpress-a9'
CROSS_TOOL='gcc'

if os.getenv('RTT_CC'):
    CROSS_TOOL = os.getenv('RTT_CC')

PLATFORM    = 'gcc'
EXEC_PATH   = '/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'

if os.getenv('RTT_EXEC_PATH'):
    EXEC_PATH = os.getenv('RTT_EXEC_PATH')

BUILD = 'debug'

if PLATFORM == 'gcc':
    # toolchains
    PREFIX = 'arm-none-eabi-'
    CC = PREFIX + 'gcc'
    CXX = PREFIX + 'g++'
    AS = PREFIX + 'gcc'
    AR = PREFIX + 'ar'
    LINK = PREFIX + 'gcc'
    TARGET_EXT = 'elf'
    SIZE = PREFIX + 'size'
    OBJDUMP = PREFIX + 'objdump'
    OBJCPY = PREFIX + 'objcopy'
    STRIP = PREFIX + 'strip'

    DEVICE = ' -march=armv7-a -marm -msoft-float'
    CFLAGS = DEVICE + ' -Wall'
    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -D__ASSEMBLY__'
    LINK_SCRIPT = 'link.lds'
    LFLAGS = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors'+\
                      ' -T %s' % LINK_SCRIPT

    CPATH = ''
    LPATH = ''

    # generate debug info in all cases
    AFLAGS += ' -gdwarf-2'
    CFLAGS += ' -g -gdwarf-2'

    if BUILD == 'debug':
        CFLAGS += ' -O0'
    else:
        CFLAGS += ' -O2'

    CXXFLAGS = CFLAGS + ' -Woverloaded-virtual -fno-exceptions -fno-rtti'

    M_CFLAGS = CFLAGS + ' -mlong-calls -fPIC '
    M_CXXFLAGS = CXXFLAGS + ' -mlong-calls -fPIC'
    M_LFLAGS = DEVICE + CXXFLAGS + ' -Wl,--gc-sections,-z,max-page-size=0x4' +\
                                    ' -shared -fPIC -nostartfiles -nostdlib -static-libgcc'
    M_POST_ACTION = STRIP + ' -R .hash $TARGET\n' + SIZE + ' $TARGET \n'

    POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' +\
                  SIZE + ' $TARGET \n'