GCC Option


## meta
gcc source file name can be placed anywhere except between option and operand
## -c
this option means do not link by ld-c makes automatically set file name to source.odo not find main functioex.
## ld
gcc linker
## -o
operand: file_nameex.
## -I (upper i)
-l option: operand: directory of header file #ex -i.. : .. meands subdirectoryex.
## -l (lower L)
operand: directory of libraryex.
## -I
operand: library nameex.