Introduction of Ubuntu Server Construction

Header file read path

Information about the read path of Ubuntu header files.

Header file for packages installed with apt

The header files for packages installed with apt are in "/ usr / include".

/ usr / include

Check the read path of the header file

The header file read path is written to the C preprocessor.

First, find out the path of the preprocessor used by gcc.

gcc -print-prog-name = cc1

The output is as follows.

/ usr / lib / gcc / x86_64-linux-gnu / 7 / cc1

When viewing the preprocessor version, the include path is displayed.

/ usr / lib / gcc / x86_64-linux-gnu / 7 / cc1 -v

The default header file read path is displayed.

ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 / usr / lib / gcc / x86_64-linux-gnu / 7 / include
 / usr / local / include
 / usr / lib / gcc / x86_64-linux-gnu / 7 / include-fixed
 / usr / include