gcc如何查找头文件（查找路径）

• 摘要

  search path.

• How does gcc find the header files

1. commond

   `gcc -print-prog-name=cc1plus` -v
   

   This command asks gcc which C++ preprocessor it is using, and then asks that preprocessor where it looks for includes.

• Tell the gcc to go the the dictinary to find header

-I dir_name

Add the directory dir_name to the head of the list of direectories to be searched for header files.This can be used to override a system header file, substituting your own version, since these directories are searched before the system header file dirctories.

• References

1. Where does gcc look for C and C++ header files?
2. How to tell the gcc to look in the include folder for the header files?