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GCC RUNTIME LIBRARY EXCEPTION

Version 3.1, 31 March 2009

Copyright © 2009 Free Software Foundation, Inc. <http://fsf.org/>

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

This GCC Runtime Library Exception ("Exception") is an additionalpermission under section 7 of the GNU General Public License, version3 ("GPLv3"). It applies to a given file (the "Runtime Library") thatbears a notice placed by the copyright holder of the file stating thatthe file is governed by GPLv3 along with this Exception.

When you use GCC to compile a program, GCC may combine portions ofcertain GCC header files and runtime libraries with the compiledprogram. The purpose of this Exception is to allow compilation ofnon-GPL (including proprietary) programs to use, in this way, theheader files and runtime libraries covered by this Exception.

0. Definitions.

A file is an "Independent Module" if it either requires the RuntimeLibrary for execution after a Compilation Process, or makes use of aninterface provided by the Runtime Library, but is not otherwise based onthe Runtime Library.

"GCC" means a version of the GNU Compiler Collection, with orwithout modifications, governed by version 3 (or a specified laterversion) of the GNU General Public License (GPL) with the option ofusing any subsequent versions published by the FSF.

"GPL-compatible Software" is software whose conditions ofpropagation, modification and use would permit combination with GCC inaccord with the license of GCC.

"Target Code" refers to output from any compiler for a real orvirtual target processor architecture, in executable form or suitablefor input to an assembler, loader, linker and/or execution phase.Notwithstanding that, Target Code does not include data in any formatthat is used as a compiler intermediate representation, or used forproducing a compiler intermediate representation.

The "Compilation Process" transforms code entirely represented innon-intermediate languages designed for human-written code, and/or inJava Virtual Machine byte code, into Target Code. Thus, for example,use of source code generators and preprocessors need not be consideredpart of the Compilation Process, since the Compilation Process can beunderstood as starting with the output of the generators orpreprocessors.

A Compilation Process is "Eligible" if it is done using GCC, aloneor with other GPL-compatible software, or if it is done without usingany work based on GCC. For example, using non-GPL-compatibleSoftware to optimize any GCC intermediate representations would notqualify as an Eligible Compilation Process.

1. Grant of Additional Permission.

You have permission to propagate a work of Target Code formed bycombining the Runtime Library with Independent Modules, even if suchpropagation would otherwise violate the terms of GPLv3, provided thatall Target Code was generated by Eligible Compilation Processes. Youmay then convey such a combination under terms of your choice,consistent with the licensing of the Independent Modules.

2. No Weakening of GCC Copyleft.

The availability of this Exception does not imply any generalpresumption that third-party software is unaffected by the copyleftrequirements of the license of GCC.

Please send general FSF & GNU inquiries to<gnu@gnu.org>.There are alsoother ways to contactthe FSF. Broken links and other corrections or suggestions can be sentto<webmasters@gnu.org>.

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