Verbose Output

Use the -v option to print verbose information to the stderr output stream. This tells you (among other things) about:

• the version of gcc being used;
• the search directories (user and system) to look for header and other source files to be included during any of the stages of compilation
• the options specified (that are normally hidden fron the user) about the arguments passed to the C preprocessor, compiler, assembler and the linker.