5 GNU Fortran Command Options

The g77 command supports all the options supported by the gcc command. See GCC Command Options, for information on the non-Fortran-specific aspects of the gcc command (and, therefore, the g77 command).

All gcc and g77 options are accepted both by g77 and by gcc (as well as any other drivers built at the same time, such as g++), since adding g77 to the gcc distribution enables acceptance of g77 options by all of the relevant drivers.

In some cases, options have positive and negative forms; the negative form of -ffoo would be -fno-foo. This manual documents only one of these two forms, whichever one is not the default.

• Option Summary: Brief list of all g77 options, without explanations.
• Overall Options: Controlling the kind of output: an executable, object files, assembler files, or preprocessed source.
• Shorthand Options: Options that are shorthand for other options.
• Fortran Dialect Options: Controlling the variant of Fortran language compiled.
• Warning Options: How picky should the compiler be?
• Debugging Options: Symbol tables, measurements, and debugging dumps.
• Optimize Options: How much optimization?
• Preprocessor Options: Controlling header files and macro definitions. Also, getting dependency information for Make.
• Directory Options: Where to find header files and libraries. Where to find the compiler executable files.
• Code Gen Options: Specifying conventions for function calls, data layout and register usage.
• Environment Variables: Env vars that affect GNU Fortran.