利用scons编译c++文件提示找不到g++

发布于 2019-10-07 22:49:39 浏览：3203 订阅该版

[tocm]

在用rt_thread开发gd32vf103v时，使用的是官方的工具链，rtconfig.py中路径已经配置正确，编译c文件没有问题，编译c++文件时（u8g2）报错，具体报错如下
（感觉是scons脚本的问题，`riscv-none-embed-gcc`可以找到，`riscv-none-embed-g++`就变成了`g++`，但是除了`rtconfig.py`外不知道具体应该到那里去找）：
```
> scons --verbose
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build
riscv-none-embed-gcc -o build\packages\LedBlink-latest\ledblink.o -c -march=rv32imac -mabi=ilp32 -DUSE_PLIC -DUSE_M_TIME -DNO_INIT -mcmodel=medany -msmall-data-limit=8 -L. -nostartfiles -lc -save-temps=obj -O0 -g3 -DHAVE_CCONFIG_H -DRT_USING_MINILIBC -I. -Iapplications -Iboard -Idrivers -Ilibraries\GD32VF103_standard_peripheral\Include -Ilibraries\GD32VF103_standard_peripheral -Ilibraries 22\drivers -Ilibraries 22\stubs -Ipackages\LedBlink-latest -Ipackages\u8g2-latest -Ipackages\u8g2-latest\port "-IG:\1 Code\STM32\RT_Thread t-thread\include" "-IG:\1 Code\STM32\RT_Thread t-thread\libcpu isc-v\common" "-IG:\1 Code\STM32\RT_Thread t-thread\libcpu isc-v\bumblebee" "-IG:\1 Code\STM32\RT_Thread t-thread\components\drivers\include" "-IG:\1 Code\STM32\RT_Thread t-thread\components\drivers\spi" "-IG:\1 Code\STM32\RT_Thread t-thread\components\finsh" "-IG:\1 Code\STM32\RT_Thread t-thread\components\libc\compilers\minilibc" packages\LedBlink-latest\ledblink.c
g++ -o build\packages\u8g2-latest\port\Print.o -c -march=rv32imac -mabi=ilp32 -DUSE_PLIC -DUSE_M_TIME -DNO_INIT -mcmodel=medany -msmall-data-limit=8 -L. -nostartfiles -lc -save-temps=obj -O0 -g3 -DHAVE_CCONFIG_H -DRT_USING_MINILIBC -I. -Iapplications -Iboard -Idrivers -Ilibraries\GD32VF103_standard_peripheral\Include -Ilibraries\GD32VF103_standard_peripheral -Ilibraries 22\drivers -Ilibraries 22\stubs -Ipackages\LedBlink-latest -Ipackages\u8g2-latest -Ipackages\u8g2-latest\port "-IG:\1 Code\STM32\RT_Thread t-thread\include" "-IG:\1 Code\STM32\RT_Thread t-thread\libcpu isc-v\common" "-IG:\1 Code\STM32\RT_Thread t-thread\libcpu isc-v\bumblebee" "-IG:\1 Code\STM32\RT_Thread t-thread\components\drivers\include" "-IG:\1 Code\STM32\RT_Thread t-thread\components\drivers\spi" "-IG:\1 Code\STM32\RT_Thread t-thread\components\finsh" "-IG:\1 Code\STM32\RT_Thread t-thread\components\libc\compilers\minilibc" packages\u8g2-latest\port\Print.cpp
Error in calling command:g++
Exception: No such file or directory

Please check Toolchains PATH setting.

scons: *** [build\packages\u8g2-latest\port\Print.o] Error 2
scons: building terminated because of errors.
```

rtconfig.py文件：
```python
import os
ARCH     = 'risc-v'
CPU      = 'bumblebee'
# toolchains options
CROSS_TOOL  = 'gcc'

#------- toolchains path -------------------------------------------------------
if os.getenv('RTT_CC'):
    CROSS_TOOL = os.getenv('RTT_CC')

if  CROSS_TOOL == 'gcc':
    PLATFORM    = 'gcc'
    # EXEC_PATH   = r'E:/RT_Thread_Env/tools/gnu_gcc/risc_v/bin'
    EXEC_PATH   = r'E:\RT_Thread_Env\tools\gnu_gcc isc_v\bin'
else:
    print('Please make sure your toolchains is GNU GCC!')
    exit(0)

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

BUILD = 'debug'
#BUILD = 'release'

CORE = 'risc-v'
MAP_FILE = 'rtthread.map'
LINK_FILE = './libraries/n22/env_Eclipse/GD32VF103xB.lds'
TARGET_NAME = 'rtthread.bin'

#------- GCC settings ----------------------------------------------------------
if PLATFORM == 'gcc':
    # toolchains
    PREFIX = 'riscv-none-embed-'
    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'

DEVICE = ' -march=rv32imac -mabi=ilp32 -DUSE_PLIC -DUSE_M_TIME -DNO_INIT -mcmodel=medany -msmall-data-limit=8 -L.  -nostartfiles  -lc '
    CFLAGS = DEVICE
    CFLAGS += ' -save-temps=obj'
    AFLAGS = '-c'+ DEVICE + ' -x assembler-with-cpp'
    AFLAGS += ' -Iplatform -Ilibraries/n22/include -Ilibraries/n22/env_Eclipse'
    LFLAGS = DEVICE
    LFLAGS += ' -Wl,--gc-sections,-cref,-Map=' + MAP_FILE
    LFLAGS += ' -T ' + LINK_FILE
    LFLAGS += ' -Wl,-wrap=memset'

CPATH = ''
    LPATH = ''

if BUILD == 'debug':
        CFLAGS += ' -O0 -g3'
        AFLAGS += ' -g3'
    else:
        CFLAGS += ' -O2'

POST_ACTION = OBJCPY + ' -O binary $TARGET ' + TARGET_NAME + ' '
 POST_ACTION += SIZE + ' $TARGET '
```

工具链中含有riscv-none-embed-g++：

![工具链.png](https://club.rt-thread.org/uploads/201910/07/224834h09r016hnn4hdzr1.png)