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(g77-295.info)Warnings and Errors

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Warning Messages and Error Messages
===================================

   The GNU compiler can produce two kinds of diagnostics: errors and
warnings.  Each kind has a different purpose:

     *Errors* report problems that make it impossible to compile your
     program.  GNU Fortran reports errors with the source file name,
     line number, and column within the line where the problem is
     apparent.

     *Warnings* report other unusual conditions in your code that
     *might* indicate a problem, although compilation can (and does)
     proceed.  Warning messages also report the source file name, line
     number, and column information, but include the text `warning:' to
     distinguish them from error messages.

   Warnings might indicate danger points where you should check to make
sure that your program really does what you intend; or the use of
obsolete features; or the use of nonstandard features of GNU Fortran.
Many warnings are issued only if you ask for them, with one of the `-W'
options (for instance, `-Wall' requests a variety of useful warnings).

   *Note:* Currently, the text of the line and a pointer to the column
is printed in most `g77' diagnostics.  Probably, as of version 0.6,
`g77' will no longer print the text of the source line, instead printing
the column number following the file name and line number in a form
that GNU Emacs recognizes.  This change is expected to speed up and
reduce the memory usage of the `g77' compiler.

   Note: Options to Request or Suppress Warnings, for
more detail on these and related command-line options.