GCC RUNTIME LIBRARY EXCEPTION
Version 3.1, 31 March 2009
Copyright (c) 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 additional permission under section 7 of the GNU General Public License,
version 3 ("GPLv3"). It applies to a given file (the "Runtime Library") that bears a notice placed by the copyright holder of
the file stating that the file is governed by GPLv3 along with this Exception.
When you use GCC to compile a program, GCC may combine portions of certain GCC header files and runtime libraries with the
compiled program. The purpose of this Exception is to allow compilation of non-GPL (including proprietary) programs to
use, in this way, the header files and runtime libraries covered by this Exception.
A file is an "Independent Module" if it either requires the Runtime Library for execution after a Compilation
Process, or makes use of an interface provided by the Runtime Library, but is not otherwise based on the Runtime Library.
"GCC" means a version of the GNU Compiler Collection, with or without modifications, governed by version 3
(or a specified later version) of the GNU General Public License (GPL) with the option of using any subsequent
versions published by the FSF.
"GPL-compatible Software" is software whose conditions of propagation, modification and use would permit combination
with GCC in accord with the license of GCC.
"Target Code" refers to output from any compiler for a real or virtual target processor architecture, in executable
form or suitable for input to an assembler, loader, linker and/or execution phase. Notwithstanding that, Target Code
does not include data in any format that is used as a compiler intermediate representation, or used for producing a
compiler intermediate representation.
The "Compilation Process" transforms code entirely represented in non-intermediate languages designed for human-written
code, and/or in Java Virtual Machine byte code, into Target Code. Thus, for example, use of source code generators and
preprocessors need not be considered part of the Compilation Process, since the Compilation Process can be understood as
starting with the output of the generators or preprocessors.
A Compilation Process is "Eligible" if it is done using GCC, alone or with other GPL-compatible software, or if it is
done without using any work based on GCC. For example, using non-GPL-compatible Software to optimize any GCC
intermediate representations would not qualify as an Eligible Compilation Process.
1. Grant of Additional Permission.
You have permission to propagate a work of Target Code formed by combining the Runtime Library with Independent Modules,
even if such propagation would otherwise violate the terms of GPLv3, provided that all Target Code was generated by
Eligible Compilation Processes. You may 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 general presumption that third-party software is unaffected by
the copyleft requirements of the license of GCC.