Introduction
This document provides a brief overview as well as usage information for the GNU* Project Debugger (GDB) based debug solutions shipped with Intel® System Studio 2018. It also provides pointers to where you can find additional product information, technical support, articles and whitepapers.
Please refer to the general Intel® System Studio 2018 release notes for an introduction to the entire suite.
What's New
This section provides an overview of recent changes to GDB based debug solutions. For information on what is new in other components of Intel® System Studio 2018, please read the individual component release notes.
Initial Version (Intel® System Studio 2018)
- GDB 7.12 (application debugger) for Linux*/Android* target
- Improved support for Intel® Processor Trace and Intel(R) Memory Protection Extensions for GDB 7.12
- Intel® Debugger for Heterogeneous Compute 2018 for Windows*
System Requirements
Please refer to the general Intel® System Studio 2018 release notes for a full list of system requirements. Only host/target systems specified there are supported.
Specific for GDB, the following features require either an Intel® Atom™ processor, or a 4th generation Intel® Core™ processor or later on the target system:
- Branch Trace Store (btrace)
The following features require a 5th generation Intel® Core™ processor or later on the target system:
- Intel® Processor Trace (Intel® PT)
For Intel® Debugger for Heterogeneous Compute 2018, the following is required:
- Hardware
- A dedicated host system is required as the target system will stop the GPU when debugging. Hence no more visual feedback is possible.
- Network connection (TCP/IP) between host and target system.
- 5th or 6th generation Intel® Core™ processor or later with Intel® Graphics Technology up to GT4e for the target system.
- Software
- Intel® System Studio 2018 for Windows* host
- Intel® HD Graphics Drivers for Windows* 15.40 and later for the target system. This package is normally already installed but can be downloaded from http://www.intel.com.
- Microsoft* Windows* 10 operating system, 64 bit edition
- Microsoft* Visual Studio* 2015
See below for more information about those features.
Documentation and Debugger Features
Documentation
To view the documentation of GDB, Intel® System Studio 2018 has to be installed first. After installation, the documentations can be found relative to the installation directory <install‑dir> under the following locations:
<install-dir>\documentation_2018\en\debugger\gdb-ia\gdb.pdf
<install-dir>\documentation_2018\en\debugger\gdb-igfx\gdb.pdf
Further information on how to use the debug solutions can be found here:
<install-dir>\documentation_2018\en\debugger\system_studio_2018\gdb-ia\get_started.htm
GDB Features
The version of GDB provided as part of Intel® System Studio 2018 is based on GDB version 7.12. Notably, it contains the following features added by Intel:
- Data Race Detection (pdbx):
Detect and locate data races for applications threaded using POSIX* threads - Branch Trace Store (btrace):
Record branches taken in the execution flow to backtrack easily after events like crashes, signals, exceptions, etc. - Pointer Checker:
Assist in finding pointer issues if compiled with Intel® C++ Compiler and having Pointer Checker feature enabled (see Intel® C++ Compiler documentation for more information) - Intel® Processor Trace (Intel® PT) support:
Improved version of Branch Trace Store supporting Intel® TSX. For 5th generation Intel® Core™ Processors and later access it via command:
(gdb) record btrace pt - Improved Intel® Cilk™ Plus support:
Serialized execution of Intel® Cilk™ Plus parallel applications can be turned on and off during a debug session using the following command:
(gdb) set cilk-serialization [on|off]
Those features are only provided for the command line version and are not supported via the Eclipse* IDE Integration.
The provided GDB documentation (gdb.pdf) contains more information in the following chapters:
- “Debugging Data Race Conditions”: pdbx feature
- “Recording Inferior’s Execution and Replaying It”: btrace feature and Intel® PT
- “Detecting Boundary Violations in Code”: Pointer Checker
- “Serializing the Execution of Parallel Applications”: Improved Intel® Cilk™ Plus Support
Eclipse* IDE Features
- Function Call History:
Visualizes Branch Trace Store & Intel® Processor Trace data. Available via menu (in Debug perspective):
Window->Show View->Function Call History
In non-Debug perspective:
Window->Show View->Other…, Debug->Function Call History
2018 Features
The version of Intel® Debugger for Heterogeneous Compute 2018 provided as part of Intel® System Studio 2018 uses GDB version 7.6. It provides the following features:
- Debugging applications containing offload enabled code to Intel® Graphics Technology
- Microsoft Visual Studio 2015* IDE integration
The provided documentation (gdb-igfx\gdb.pdf) contains more information.
Installation Notes
During the installation process of Intel® System Studio 2018, GNU* GDB 7.12 will be installed by default (for Linux*/Android* target). Otherwise, make sure it appears in the component list as needed.
In case it is not, or you want to modify the default, select Customize and navigate through the menus to change components:
Continue via button Next and finish the installation.
For the Intel® Debugger for Heterogeneous Compute 2018 (for Windows* target only), the appropriate component should be selected:
Please note that the sources for GDB and Python are not required for normal operation.
The provided debug solution will be automatically integrated into an Eclipse* IDE of your choice. If you do not specify one (default: Install Eclipse* IDE…) it provides an own Eclipse* IDE. This takes place if you continue with the installation of Intel® System Studio 2018. Activate the item Integrate with my existing installation of Eclipse; and provide the path to the Eclipse* IDE installed in the dialog below. Leave the default when you want to use the shipped Eclipse* IDE or turn off integration via third item.
Please refer to section 0 for further information on how to get started.
Known Issues
The following issues are known for the current release:
Unable to find dynamic linker breakpoint function
GDB might print the following warning:
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code.
When remotely debugging applications the same binaries need to be available on the host running GDB. GDB needs to be instructed where to find those by using the command
set sysroot <path>. <path> is the root directory on the host containing a copy of the target binaries.
Please refer to the GDB documentation (see section Documentation) for more information.
Could not load shared library symbols
GDB might print the following warning:
warning: Could not load shared library symbols for 2 libraries, e.g. /lib64/libc.so.6.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
When remotely debugging applications the same binaries need to be available on the host running GDB. GDB needs to be instructed where to find those by using the command
set sysroot <path>. <path> is the root directory on the host containing a copy of the target binaries.
Please refer to the GDB documentation (see section Documentation) for more information.
Warning about missing OS ABI “Cygwin”
The following warning is side effect of the host ABI being different to the target:
warning: A handler for the OS ABI "Cygwin" is not built into this configuration of GDB. Attempting to continue with the default i386:x86-64 settings.
This warning is for the host only. It can be safely ignored because debugging is only enabled for supported target systems which exclude the host.
Error “ImportError: No module named site” when starting provided GDB
In case this error shows up when starting the provided GDB, please make sure that the environment variable PYTHONHOME points to the following location:
<install‑dir>\debugger_2018\python\<arch>\
The value of <arch> is ia32 or intel64, identifying the architecture of the host system.
The installer will add that variable to your system and you should not see this error with a correct installation. Hence, if you see the above error message, please verify that your installation is correct or install again.
CDT 8.0 is not supported for the debugger plug-in
The general Intel® System Studio 2018 release notes list support for CDT 8.0 and higher. However, the GDB-IA (DSF) debugger plug-in is only supported for CDT 8.1 and higher.
Manually installing provided Eclipse* IDE plug-ins requires a certain order
When manually installing Eclipse* IDE plug-ins that come with Intel® System Studio 2018 a certain order must be maintained. The plug-in of the debugger has a dependency on the one of the compiler. Hence, the plug-in of the compiler has to be installed prior to the one of the debugger. When removing the compiler (or it’s plug-in), the plug-in of the debugger has to be removed first.
We strongly recommend to use the Eclipse* IDE integration feature of the Intel® System Studio 2018 installer rather than manually installing the plug-ins.
Target connect requires tcp: hint
When connecting to the target, please add tcp: in front of the target name/IP address, e.g.:
(gdb) target remote tcp:<target>:2000
Security extensions hinder gdbserver to start
Integrity Measurement Architecture (IMA), e.g. Wind River Linux 5:
Start of gdbserver fails with Permission denied. Log file /var/log/syslog reads:
<date>WR-IntelligentDevice kernel: [???] IMA_Measurement: ERROR: <path_to_gdbserver>/gdbserver failed appraisement
To use gdbserver turn off IMA when building the image via --without-layer=wr-srm.
IMA can also be deactivated without a rebuild by specifying ima_appraise=off with the kernel boot options.
PaX:
Start of gdbserver fails with gdbserver: Cannot call inferior functions, Linux kernel PaX protection forbids return to non-executable pages!
To use gdbserver specify pax_softmode=1 in the kernel boot options ("permit by default" mode). This requires that the gdbserver executable is attributed with the correct permissions. Use the paxctl tool to do so:
$ paxctl –c <path_to_gdbserver>/gdbserver
$ paxctl –perms <path_to_gdbserver>/gdbserver
For more information please refer to the PaX documentation.
Evaluation of expressions with side-effects
The debugger does not evaluate expressions that contain assignments which read memory locations before writing to them (e.g. x = x + 1). Please do not use such assignments when evaluating expressions.
Function Call History in Eclipse* IDE only shown for thread causing event
Displaying the Function Call History in Eclipse* IDE only works for the thread that caused an event (i.e. a stop). It is currently not possible to switch the Function Call History to another thread. This will be fixed in a future release.
Chrome OS* debugging
In general, the device needs to be booted into development mode.
Drives mounted with “noexec” flag prevent execution:
When debugging a native application on Chrome OS*, execution of gdbserver and or the native application under debug might be prevented if the volume was mounted with the “noexec” flag set.
To use gdbserver, either select a volume that has been mounted without the “noexec” flags or remount the desired volume with the correct settings. Please consult the “Developer Guide”[1] and the “Chromium on Chromium OS Debugging Tips”[2] sections of the Chrome OS* web site.
iptables settings might prevent connection to gdbserver:
The default iptables settings on the target device might prevent a successful connection from GDB to gdbserver, causing a time out when trying to connect.
To use gdbserver, please modify the iptables settings as described in the “Chromium on Chromium OS Debugging Tips”[2].
[1]: http://www.chromium.org/chromium-os/developer-guide
[2]: https://www.chromium.org/chromium-os/how-tos-and-troubleshooting/debugging-tips
Intel® Debugger for Heterogeneous Compute 2018
No call-stack
There is currently no provision for call-stack display. This will be addressed in future version of the debugger.
Un-interruptible threads
Due to hardware limitations it is not possible to interrupt a running thread. This may cause intermittent side-effects while debugging, where the debugger displays incorrect register and variable value for these threads. It might also show up as displaying SIGTRAP messages when breakpoints get removed while other threads are running.
Evaluation of expressions with side-effects
The debugger does not evaluate expressions that contain assignments which read memory locations before writing to them (e.g. x = x + 1). Please do not use such assignments when evaluating expressions.
Attributions
This product includes software developed at:
GDB – The GNU* Project Debugger
Copyright Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
This program is free software; you can redistribute it and/or modify it under the terms and conditions of the GNU General Public License, version 2, as published by the Free Software Foundation.
This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
GNU* Free Documentation License
Version 1.3, 3 November 2008
Copyright © 2000, 2001, 2002, 2007, 2008 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.
0. PREAMBLE
The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others.
This License is a kind of "copyleft", which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.
We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference.
1. APPLICABILITY AND DEFINITIONS
This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The "Document", below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as "you". You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law.
A "Modified Version" of the Document means any work containing the Document or a portion of it, either copied verbatim, or with modifications and/or translated into another language.
A "Secondary Section" is a named appendix or a front-matter section of the Document that deals exclusively with the relationship of the publishers or authors of the Document to the Document's overall subject (or to related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The relationship could be a matter of historical connection with the subject or with related matters, or of legal, commercial, philosophical, ethical or political position regarding them.
The "Invariant Sections" are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none.
The "Cover Texts" are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover Text may be at most 25 words.
A "Transparent" copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not "Transparent" is called "Opaque".
Examples of suitable formats for Transparent copies include plain ASCII without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only.
The "Title Page" means, for a printed book, the title page itself, plus such following pages as are needed to hold, legibly, the material this License requires to appear in the title page. For works in formats which do not have any title page as such, "Title Page" means the text near the most prominent appearance of the work's title, preceding the beginning of the body of the text.
The "publisher" means any person or entity that distributes copies of the Document to the public.
A section "Entitled XYZ" means a named subunit of the Document whose title either is precisely XYZ or contains XYZ in parentheses following text that translates XYZ in another language. (Here XYZ stands for a specific section name mentioned below, such as "Acknowledgements", "Dedications", "Endorsements", or "History".) To "Preserve the Title" of such a section when you modify the Document means that it remains a section "Entitled XYZ" according to this definition.
The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License.
2. VERBATIM COPYING
You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3.
You may also lend copies, under the same conditions stated above, and you may publicly display copies.
3. COPYING IN QUANTITY
If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document's license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects.
If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages.
If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public.
It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.
4. MODIFICATIONS
You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:
A. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission.
B. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement.
C. State on the Title page the name of the publisher of the Modified Version, as the publisher.
D. Preserve all the copyright notices of the Document.
E. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices.
F. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below.
G. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document's license notice.
H. Include an unaltered copy of this License.
I. Preserve the section Entitled "History", Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled "History" in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence.
J. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the "History" section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission.
K. For any section Entitled "Acknowledgements" or "Dedications", Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein.
L. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles.
M. Delete any section Entitled "Endorsements". Such a section may not be included in the Modified Version.
N. Do not retitle any existing section to be Entitled "Endorsements" or to conflict in title with any Invariant Section.
O. Preserve any Warranty Disclaimers.
If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version's license notice. These titles must be distinct from any other section titles.
You may add a section Entitled "Endorsements", provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard.
You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one.
The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version.
5. COMBINING DOCUMENTS
You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers.
The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work.
In the combination, you must combine any sections Entitled "History" in the various original documents, forming one section Entitled "History"; likewise combine any sections Entitled "Acknowledgements", and any sections Entitled "Dedications". You must delete all sections Entitled "Endorsements".
6. COLLECTIONS OF DOCUMENTS
You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.
You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.
7. AGGREGATION WITH INDEPENDENT WORKS
A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an "aggregate" if the copyright resulting from the compilation is not used to limit the legal rights of the compilation's users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.
If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document's Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.
8. TRANSLATION
Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.
If a section in the Document is Entitled "Acknowledgements", "Dedications", or "History", the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.
9. TERMINATION
You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License.
However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.
Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it.
10. FUTURE REVISIONS OF THIS LICENSE
The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See http://www.gnu.org/copyleft/.
Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License "or any later version" applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Document.
11. RELICENSING
"Massive Multiauthor Collaboration Site" (or "MMC Site") means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A "Massive Multiauthor Collaboration" (or "MMC") contained in the site means any set of copyrightable works thus published on the MMC site.
"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.
"Incorporate" means to publish or republish a Document, in whole or in part, as part of another Document.
An MMC is "eligible for relicensing" if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.
The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.
Disclaimer and Legal Information
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