Python - 通过交叉编译将C和Python程序移植到arm机中相关库和文件找不到的问题解决
上一篇的程序通过gcc在x86电脑中可以正确运行,但是移植到arm中时通过arm交叉编译会提示错误。
编译命令为:
main:main.c arm-linux-gnueabihf-gcc -I/usr/include/python2.7/ main.c -o main -L/usr/lib -lpython2.7 clean: rm -rf *.o main
第一个错误:提示找不到pyconfig.h文件
In file included from /usr/include/python2.7/Python.h:8:0, from main.c:3: /usr/include/python2.7/pyconfig.h:13:54: fatal error: arm-linux-gnueabihf/python2.7/pyconfig.h: No such file or directory # include <arm-linux-gnueabihf/python2.7/pyconfig.h>
在/usr/include的pyconfig.h文件中看到是根据不同的平台,pyconfig文件不一致
# elif defined(__ARM_EABI__) && defined(__ARM_PCS_VFP) # include <arm-linux-gnueabihf/python2.7/pyconfig.h> # elif defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP) # include <arm-linux-gnueabi/python2.7/pyconfig.h>
查找pyconfig.h所在的目录
sudo find / -name pyconfig.h
/home/duser/mk5/bsp/image/rootfs/usr/include/arm-linux-gnueabihf/python2.7/pyconfig.h
将该目录添加到-I目录中
main:main.c arm-linux-gnueabihf-gcc -I/home/duser/mk5/bsp/image/rootfs/usr/include/ -I/usr/include/python2.7/ main.c -o main -L/usr/lib -lpython2.7 clean: rm -rf *.o main
2,pyconfig的问题解决后,再次编译又出现以下错误:
/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lpython2.7
通常引起该错误的原因为(1)没有安装对应的库(2)路径链接错误;Python2.7的库可以确定已经安装,所以只能为pythin2.7库的链接路径错误,通过查找找到对应arm机的python2.7库,将其链接到/usr/lib/ld中。
duser@172.20.10.7:/usr/lib$ sudo ln -sv /home/duser/mk5/bsp/image/rootfs/usr/lib/arm-linux-gnueabihf/libpython2.7.so libpython2.7.so
再次运行,提示仍有库缺少,根据上述方法将其链接到ld中;编译通过后将main文件和py_add.py下载到arm机中,运行正常。
root@MK5:/mnt/ubi# ./main Function of python called! ('a = ', 123) ('b = ', 321) ('a + b = ', 444)