Question

This question may be pretty simple, but i dont find exact answers ..

in shell script i have a line like this,

export CFLAGS=" -w -Iinc/ -Isrc/"

I dont know what is that -w and -I options doing here??

All i know is this line includes the directories inc and src

Any help would be great

Answer 1

This just sets an environment variable. I’m guessing that it gets used to set flags for GCC.

From man gcc:

   -I dir
       Add the directory dir to the list of directories to be searched for
       header files.  Directories named by -I are searched before the
       standard system include directories.  If the directory dir is a
       standard system include directory, the option is ignored to ensure
       that the default search order for system directories and the
       special treatment of system headers are not defeated .

   -w  Suppress all warnings, including those which GNU CPP issues by
       default.