如何得到编译器预处理头文件搜索路径?

gcc可以通过--verbose获取。例如gcc --verbose demo.c

#include "…" search starts here:

#include <…> search starts here:

/usr/lib/gcc/x86_64-linux-gnu/11/include
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.