gcc -H ...将打印每个包含文件的完整路径，作为常规编译的副作用。
-fsyntax-only另外使用使其不创建任何输出（它仍然会告诉您程序是否有错误）。示例（Linux，gcc-4.7）：
$ cat > test.c#include <stdbool.h>#include <stdio.h>^D$ gcc -H -fsyntax-only test.c. /usr/lib/gcc/x86_64-linux-gnu/4.7/include/stdbool.h. /usr/include/stdio.h.. /usr/include/features.h... /usr/include/x86_64-linux-gnu/bits/predefs.h... /usr/include/x86_64-linux-gnu/sys/cdefs.h.... /usr/include/x86_64-linux-gnu/bits/wordsize.h... /usr/include/x86_64-linux-gnu/gnu/stubs.h.... /usr/include/x86_64-linux-gnu/bits/wordsize.h.... /usr/include/x86_64-linux-gnu/gnu/stubs-64.h.. /usr/lib/gcc/x86_64-linux-gnu/4.7/include/stddef.h.. /usr/include/x86_64-linux-gnu/bits/types.h... /usr/include/x86_64-linux-gnu/bits/wordsize.h... /usr/include/x86_64-linux-gnu/bits/typesizes.h.. /usr/include/libio.h... /usr/include/_G_config.h.... /usr/lib/gcc/x86_64-linux-gnu/4.7/include/stddef.h.... /usr/include/wchar.h... /usr/lib/gcc/x86_64-linux-gnu/4.7/include/stdarg.h.. /usr/include/x86_64-linux-gnu/bits/stdio_lim.h.. /usr/include/x86_64-linux-gnu/bits/sys_errlist.h
每行开头的点表示嵌套的深度
#include。
