求解答一个SCONS的问题

发布于 2015-09-12 14:11:46 浏览：2592 订阅该版

[tocm]

各位大神们：
以前没有使用过SCONS作为编译工具，所以现在遇到了一个小问题，问题如下：
环境： mac-OS 
交叉编译工具： arm-none-eabi-gcc4.9.3
SCONS版本： 2.3.6
目标平台： stm32f103
需求： 需要编译 C和C++ 混合的工程。
问题： 在rtconfig.py中定义了CC和CXX，但是在编译时，CC的确用的交叉编译gcc，合适CXX仍然用的本地的g++。

BTW：开始考虑是不是自己的SConscript写的有问题，所以就尝试在rtt repo中编译了components里面的CPLUSPLUS那个项目，出现的问题是一样的，仍然用的本地g++。

求大神门解答一下 [s:154]  [s:154]

附录：
1. rtconfig.py的内容：

```
import os

# toolchains options
ARCH='arm'
CPU='cortex-m3'
CROSS_TOOL='gcc'

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

# cross_tool provides the cross compiler
# EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR

if  CROSS_TOOL == 'gcc':
	PLATFORM 	= 'gcc'
	EXEC_PATH 	= '/Users/schumy/gcc-arm-none-eabi/bin'
elif CROSS_TOOL == 'keil':
	PLATFORM 	= 'armcc'
	EXEC_PATH 	= ''
elif CROSS_TOOL == 'iar':
	PLATFORM 	= 'iar'
	IAR_PATH 	= ''

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

BUILD = ''
STM32_TYPE = 'STM32F10X_MD'

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

DEVICE = ' -mcpu=cortex-m3 -march=armv7-m -mthumb'
    CFLAGS = DEVICE + ' -ffunction-sections -fdata-sections -nostdlib -DMCU_STM32F103T8'
    CXXFLAGS = DEVICE + ' -fno-exceptions -fno-rtti -DMCU_STM32F103T8'
    AFLAGS = DEVICE
    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-stm32.map,-cref,-u,Reset_Handler -T stm32_rom.ld'

CPATH = ''
    LPATH = ''

if BUILD == 'debug':
        CFLAGS += ' -O0 -gdwarf-2'
        AFLAGS += ' -gdwarf-2'
    else:
        CFLAGS += ' -O2'

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

```

6 个回答

schumy 2015-09-12

这家伙很懒，什么也没写！

这个是编译时出错的输出。

```

cons --verbose
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build/bsp
g++ -o build/bsp/maple/wirish/HardwareSPI.o -c -mcpu=cortex-m3 -march=armv7-m -mthumb -ffunction-sections -fdata-sections -nostdlib -DMCU_STM32F103T8 -O2 -DUSE_STDPERIPH_DRIVER -DSTM32F10X_MD -DRT_USING_MINILIBC -I. -Iapplications -Idrivers -IEFlash -ILibraries/STM32F10x_StdPeriph_Driver/inc -ILibraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x -I/Users/schumy/git/rt-thread/rtt/components/CMSIS/Include -Imaple/libmaple -Imaple/libmaple/include -Imaple/libmaple/stm32f1/include -Imaple/libmaple/usb/stm32f1 -Imaple/libmaple/usb/usb_lib -Imaple/wirish -Imaple/wirish/include -Imaple/wirish/boards/wrtnode2/include -Imaple/wirishC/include -I/Users/schumy/git/rt-thread/rtt/include -I/Users/schumy/git/rt-thread/rtt/libcpu/arm/cortex-m3 -I/Users/schumy/git/rt-thread/rtt/libcpu/arm/common -I/Users/schumy/git/rt-thread/rtt/components/drivers/include -I/Users/schumy/git/rt-thread/rtt/components/drivers/spi -I/Users/schumy/git/rt-thread/rtt/components/drivers/include -I/Users/schumy/git/rt-thread/rtt/components/drivers/include -I/Users/schumy/git/rt-thread/rtt/components/finsh -I/Users/schumy/git/rt-thread/rtt/components/libc/minilibc -I/Users/schumy/git/rt-thread/rtt/components/utilities/ymodem maple/wirish/HardwareSPI.cpp
clang: warning: argument unused during compilation: '-mcpu=cortex-m3'
clang: warning: argument unused during compilation: '-mthumb'
error: unknown target CPU 'armv7-m'
scons: *** [build/bsp/maple/wirish/HardwareSPI.o] Error 1
scons: building terminated because of errors.

```