..
  Copyright 1988-2022 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the copyright.rst file.

The C Preprocessor
==================

The C preprocessor implements the macro language used to transform C,
C++, and Objective-C programs before they are compiled.  It can also be
useful on its own.

.. only:: html

  Contents:

.. toctree::

  copyright
  overview
  header-files
  macros
  conditionals
  diagnostics
  line-control
  pragmas
  other-directives
  preprocessor-output
  traditional-mode
  implementation-details
  invocation
  environment-variables
  gnu-free-documentation-license

  indices-and-tables