cmu-lab1 编译问题解决

做cmu lab1时，在终端运行

gcc -O -Wall -m32 -lm -o btest bits.c btest.c decl.c tests.c

报错

In file included from /usr/include/stdio.h:27:0,
                 from btest.c:16:
/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory
compilation terminated.
In file included from /usr/include/stdio.h:27:0,
                 from decl.c:1:
/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory

搜索得知Ubuntu 64位运行32编译代码时，需要在终端

在终端运行该语句，安装下面的东西即可解决。

sudo apt-get install build-essential module-assistant

sudo apt-get install gcc-multilib g++-multilib