g77.info: Preprocessor Options

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Options Controlling the Preprocessor

   These options control the C preprocessor, which is run on each C
source file before actual compilation.

   *Note Options Controlling the Preprocessor: (gcc)Preprocessor
Options, for information on C preprocessor options.

   Some of these options also affect how `g77' processes the `INCLUDE'
directive.  Since this directive is processed even when preprocessing
is not requested, it is not described in this section.  *Note Options
for Directory Search: Directory Options, for information on how `g77'
processes the `INCLUDE' directive.

   However, the `INCLUDE' directive does not apply preprocessing to the
contents of the included file itself.

   Therefore, any file that contains preprocessor directives (such as
`#include', `#define', and `#if') must be included via the `#include'
directive, not via the `INCLUDE' directive.  Therefore, any file
containing preprocessor directives, if included, is necessarily
included by a file that itself contains preprocessor directives.