GNU GCC

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-c	Do not link
-D	Create a preprocessor definition, like a #define directive in the source code
-g	Produce debugging information for GDB (-g0 negates -g)
-I	Specify directories to search for header files, libraries etc
-llibrary	Search the library named library when linking
-Ldir	Add directory dir to the list of directories to be searched for -l
-M	Preprocessor: Output a rule suitable for make describing the dependencies..?
-o	Specify output file. Applies to object files and executables
-pg	Generate extra code to write profile information suitable for the analysis program `gprof`
-Wall	enable most warnings