Linux下，gcc 编译c代码的问题

daybreakcx

1.        -I dir
   
2.            Add the directory dir to the list of directories to be searched for header files.  Directories named by -I
   
3.            are searched before the standard system include directories.  If the directory dir is a standard system
   
4.            include directory, the option is ignored to ensure that the default search order for system directories and
   
5.            the special treatment of system headers are not defeated .  If dir begins with "=", then the "=" will be
   
6.            replaced by the sysroot prefix; see --sysroot and -isysroot.
   

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