Compilation Flags

-c                               compile only, do not link

-o filename                  Use filename as the name of the compiled program

-Dsymbol-value             Define symbol during compilation.

-g                              Include debugging information in compiled code

                                 (required if you want to be able to run the gdb degugger).

-O                              Optimize the compiled code (produces smaller, faster programs

                                 but takes longer to compile)

-l directory                  Add directory to the list of places searched when a "system"

                                include (#include ...) is encountered.