如何分别给 c代码和 C++代码设定编译参数

[Guozhanxin]

按照下面这种写法，先把 CFlags 赋值给 CXXFlags，然后再单独给 CFlag 添加参数。编译时，新添加的参数仍然会传递给 CXX 编译器。
bsp: stm32-f429-apollo
编译器：armclang.

elif PLATFORM == 'armclang':
    # toolchains
    CC = 'armclang'
    CXX = 'armclang'
    AS = 'armasm'
    AR = 'armar'
    LINK = 'armlink'
    TARGET_EXT = 'axf'

    DEVICE = ' --cpu Cortex-M4.fp '
    CFLAGS = ' --target=arm-arm-none-eabi -mcpu=cortex-m4 '
    CFLAGS += ' -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 '
    CFLAGS += ' -mfloat-abi=hard -c -fno-rtti -funsigned-char -fshort-enums -fshort-wchar '
    CFLAGS += ' -gdwarf-3 -ffunction-sections '
    AFLAGS = DEVICE + ' --apcs=interwork '
    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers '
   ...
    CXXFLAGS = CFLAGS
    CFLAGS += ' -std=c99'

    POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'

[thewon86]

把特别的部分分离成库，多项目协作

[BernardXiong]

这部分好像问题是出现在SConstruct里，

env = Environment(tools = ['mingw'],
    AS   = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
    CC   = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
    CXX  = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
    AR   = rtconfig.AR, ARFLAGS = '-rc',
    LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)

其中的CCFLAGS是代表了C和C++的参数，需要分离开来。但是目前所有BSP似乎都是CCFLAGS了……

[Guozhanxin]

CXXFLAGS 

如果 CCFLAGS 是C和C++公共的参数，那 CFLAGS 和 CXXFLAGS 就应该仅包含各自独立的参数了？比如 ' -xc' 和 ' -xc++'

[Guozhanxin]

#2855

[mysterywolf]

#4953

[liukangcc]

#5171

[mysterywolf]

#5397