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This file documents the use of the GNU compilers.

Copyright © 1988-2018 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being ``Funding Free Software'', the Front-Cover Texts being (a) (see below), and with the Back-Cover Texts being (b) (see below).  A copy of the license is included in the section entitled ``GNU Free Documentation License''.

(a) The FSF's Front-Cover Text is:

A GNU Manual

(b) The FSF's Back-Cover Text is:

You have freedom to copy and modify this GNU Manual, like GNU software.  Copies published by the Free Software Foundation raise funds for GNU development.

Introduction
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This manual documents how to use the GNU compilers, as well as their features and incompatibilities, and how to report bugs.  It corresponds to the compilers version version-GCC. The internals of the GNU compilers, including how to port them to new targets and some information about how to write front ends for new languages, are documented in a separate manual.  See Introduction (GNU Compiler Collection (GCC) Internals).

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Option Index
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GCC's command line options are indexed here without any initial - or --.  Where an option has both positive and negative forms (such as -fOPTION and -fno-OPTION), relevant entries in the manual are indexed under the most appropriate form; it may sometimes be useful to look up both forms.