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Pedantic Compilation

The -fpedantic command-line option specifies that g77 is to warn about code that is not standard-conforming. This is useful for finding some extensions g77 accepts that other compilers might not accept. (Note that the -pedantic and -pedantic-errors options always imply -fpedantic.)

With -fno-f90 in force, ANSI FORTRAN 77 is used as the standard for conforming code. With -ff90 in force, Fortran 90 is used.

The constructs for which g77 issues diagnostics when -fpedantic and -fno-f90 are in force are:

If -fpedantic is specified along with -ff90, the following constructs result in diagnostics: