yann@1
|
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File.........: overview.txt
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yann@197
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Content......: Overview of how crosstool-NG works.
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yann@92
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Copyrigth....: (C) 2007 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>
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License......: Creative Commons Attribution Share Alike (CC-by-sa), v2.5
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____________________
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/
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yann@628
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Table Of Content /
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|
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_________________/
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yann@628
|
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yann@628
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yann@628
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Introduction
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yann@628
|
13 |
History
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yann@1581
|
14 |
Referring to crosstool-NG
|
yann@628
|
15 |
Installing crosstool-NG
|
yann@628
|
16 |
Install method
|
yann@628
|
17 |
The hacker's way
|
yann@1048
|
18 |
Preparing for packaging
|
yann@837
|
19 |
Shell completion
|
yann@628
|
20 |
Contributed code
|
yann@628
|
21 |
Configuring crosstool-NG
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yann@628
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22 |
Interesting config options
|
yann@628
|
23 |
Re-building an existing toolchain
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yann@1842
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24 |
Using as a backend for a build-system
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yann@628
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25 |
Running crosstool-NG
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yann@628
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26 |
Stopping and restarting a build
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27 |
Testing all toolchains at once
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Overriding the number of // jobs
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yann@1491
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Note on // jobs
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Tools wrapper
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yann@628
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31 |
Using the toolchain
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yann@1554
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The 'populate' script
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yann@628
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Toolchain types
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yann@1551
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34 |
Seemingly-native toolchains
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yann@1575
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Contributing
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yann@1575
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Sending a bug report
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yann@1575
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37 |
Sending patches
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yann@628
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38 |
Internals
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yann@628
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39 |
Makefile front-end
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yann@628
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Kconfig parser
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yann@628
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41 |
Architecture-specific
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yann@628
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42 |
Adding a new version of a component
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yann@628
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43 |
Build scripts
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yann@628
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44 |
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yann@1580
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yann@1
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________________
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yann@1
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/
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yann@1
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Introduction /
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yann@1
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_____________/
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yann@1
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yann@1
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crosstool-NG aims at building toolchains. Toolchains are an essential component
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yann@1
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52 |
in a software development project. It will compile, assemble and link the code
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rpjday@436
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53 |
that is being developed. Some pieces of the toolchain will eventually end up
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yann@1
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54 |
in the resulting binary/ies: static libraries are but an example.
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yann@1
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55 |
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yann@1
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56 |
So, a toolchain is a very sensitive piece of software, as any bug in one of the
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yann@1
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components, or a poorly configured component, can lead to execution problems,
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yann@1
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ranging from poor performance, to applications ending unexpectedly, to
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yann@1
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59 |
mis-behaving software (which more than often is hard to detect), to hardware
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rpjday@436
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damage, or even to human risks (which is more than regrettable).
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yann@1
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61 |
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yann@1
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Toolchains are made of different piece of software, each being quite complex
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yann@1
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63 |
and requiring specially crafted options to build and work seamlessly. This
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yann@1
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64 |
is usually not that easy, even in the not-so-trivial case of native toolchains.
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yann@1
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65 |
The work reaches a higher degree of complexity when it comes to cross-
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yann@40
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compilation, where it can become quite a nightmare...
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yann@1
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67 |
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yann@40
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Some cross-toolchains exist on the internet, and can be used for general
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yann@1
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development, but they have a number of limitations:
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yann@1
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- they can be general purpose, in that they are configured for the majority:
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yann@1
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no optimisation for your specific target,
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yann@1
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- they can be prepared for a specific target and thus are not easy to use,
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yann@1
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nor optimised for, or even supporting your target,
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rpjday@436
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- they often are using aging components (compiler, C library, etc...) not
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yann@1
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75 |
supporting special features of your shiny new processor;
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yann@1
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76 |
On the other side, these toolchain offer some advantages:
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yann@1
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- they are ready to use and quite easy to install and setup,
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yann@1
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- they are proven if used by a wide community.
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yann@1
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yann@1
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But once you want to get all the juice out of your specific hardware, you will
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want to build your own toolchain. This is where crosstool-NG comes into play.
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yann@1
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rpjday@436
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There are also a number of tools that build toolchains for specific needs,
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rpjday@436
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which are not really scalable. Examples are:
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rpjday@436
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- buildroot (buildroot.uclibc.org) whose main purpose is to build root file
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yann@1
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systems, hence the name. But once you have your toolchain with buildroot,
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yann@1
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87 |
part of it is installed in the root-to-be, so if you want to build a whole
|
yann@1
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new root, you either have to save the existing one as a template and
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yann@1
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restore it later, or restart again from scratch. This is not convenient,
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yann@1
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90 |
- ptxdist (www.pengutronix.de/software/ptxdist), whose purpose is very
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yann@1
|
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similar to buildroot,
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yann@702
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- other projects (openembedded.org for example), which are again used to
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yann@1
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build root file systems.
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yann@1
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rpjday@436
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crosstool-NG is really targeted at building toolchains, and only toolchains.
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yann@1
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It is then up to you to use it the way you want.
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yann@1
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yann@1580
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yann@1
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___________
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/
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yann@1
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History /
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yann@1
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________/
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yann@1
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crosstool was first 'conceived' by Dan Kegel, who offered it to the community
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yann@1
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as a set of scripts, a repository of patches, and some pre-configured, general
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yann@1
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purpose setup files to be used to configure crosstool. This is available at
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yann@203
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http://www.kegel.com/crosstool, and the subversion repository is hosted on
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yann@203
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google at http://code.google.com/p/crosstool/.
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yann@1
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I once managed to add support for uClibc-based toolchains, but it did not make
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yann@437
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into mainline, mostly because I didn't have time to port the patch forward to
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yann@1
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the new versions, due in part to the big effort it was taking.
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yann@1
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yann@1
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So I decided to clean up crosstool in the state it was, re-order the things
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yann@437
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in place, add appropriate support for what I needed, that is uClibc support
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yann@437
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and a menu-driven configuration, named the new implementation crosstool-NG,
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yann@437
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(standing for crosstool Next Generation, as many other comunity projects do,
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yann@437
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and as a wink at the TV series "Star Trek: The Next Generation" ;-) ) and
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yann@437
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made it available to the community, in case it was of interest to any one.
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yann@1
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yann@1580
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yann@1581
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_____________________________
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yann@1581
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/
|
yann@1581
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Referring to crosstool-NG /
|
yann@1581
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125 |
__________________________/
|
yann@1581
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126 |
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yann@1581
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127 |
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yann@1581
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The long name of the project is crosstool-NG:
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yann@1581
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* no leading uppercase (except as first word in a sentence)
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yann@1581
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* crosstool and NG separated with a hyphen (dash)
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yann@1581
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131 |
* NG in uppercase
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yann@1581
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yann@1581
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Crosstool-NG can also be referred to by its short name CT-NG:
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yann@1581
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* all in uppercase
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yann@1581
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* CT and NG separated with a hyphen (dash)
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yann@1581
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yann@1581
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The long name is preferred over the short name, except in mail subjects, where
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yann@1581
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the short name is a better fit.
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yann@1581
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yann@1581
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When referring to a specific version of crosstool-NG, append the version number
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yann@1581
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either as:
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yann@1581
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* crosstool-NG X.Y.Z
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yann@1581
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- the long name, a space, and the version string
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yann@1581
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* crosstool-ng-X.Y.Z
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yann@1581
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- the long name in lowercase, a hyphen (dash), and the version string
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yann@1581
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146 |
- this is used to name the release tarballs
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yann@1581
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147 |
* crosstool-ng-X.Y.Z+hg_id
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yann@1581
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- the long name in lowercase, a hyphen, the version string, and the Hg id
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yann@1581
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(as returned by: ct-ng version)
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yann@1581
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- this is used to differentiate between releases and snapshots
|
yann@1581
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151 |
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yann@1581
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152 |
The frontend to crosstool-NG is the command ct-ng:
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yann@1581
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* all in lowercase
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yann@1581
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* ct and ng separated by a hyphen (dash)
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yann@1581
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yann@1581
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yann@294
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___________________________
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yann@294
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/
|
yann@294
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159 |
Installing crosstool-NG /
|
yann@294
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160 |
________________________/
|
yann@294
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161 |
|
yann@294
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162 |
There are two ways you can use crosstool-NG:
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yann@294
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- build and install it, then get rid of the sources like you'd do for most
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yann@294
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programs,
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yann@294
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- or only build it and run from the source directory.
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yann@294
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166 |
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yann@294
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The former should be used if you got crosstool-NG from a packaged tarball, see
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"Install method", below, while the latter is most useful for developpers that
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yann@1576
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use a clone of the repository, and want to submit patches, see "The Hacker's
|
yann@294
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way", below.
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yann@294
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171 |
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yann@294
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172 |
Install method |
|
yann@294
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173 |
---------------+
|
yann@294
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174 |
|
yann@294
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175 |
If you go for the install, then you just follow the classical, but yet easy
|
yann@294
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./configure way:
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yann@294
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177 |
./configure --prefix=/some/place
|
yann@294
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178 |
make
|
yann@294
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179 |
make install
|
yann@294
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180 |
export PATH="${PATH}:/some/place/bin"
|
yann@294
|
181 |
|
yann@294
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182 |
You can then get rid of crosstool-NG source. Next create a directory to serve
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yann@294
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183 |
as a working place, cd in there and run:
|
yann@294
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184 |
ct-ng help
|
yann@294
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185 |
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yann@294
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186 |
See below for complete usage.
|
yann@294
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187 |
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yann@294
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188 |
The Hacker's way |
|
yann@294
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189 |
-----------------+
|
yann@294
|
190 |
|
yann@294
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191 |
If you go the hacker's way, then the usage is a bit different, although very
|
yann@294
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192 |
simple:
|
yann@294
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193 |
./configure --local
|
yann@294
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194 |
make
|
yann@294
|
195 |
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yann@294
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196 |
Now, *do not* remove crosstool-NG sources. They are needed to run crosstool-NG!
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yann@294
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Stay in the directory holding the sources, and run:
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yann@294
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./ct-ng help
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yann@294
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199 |
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yann@294
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See below for complete usage.
|
yann@294
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201 |
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yann@1554
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Now, provided you used a clone of the repository, you can send me your changes.
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yann@1575
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See the section titled CONTRIBUTING, below, for how to submit changees.
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yann@1048
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Preparing for packaging |
|
yann@1048
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------------------------+
|
yann@1048
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207 |
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yann@1048
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208 |
If you plan on packaging crosstool-NG, you surely don't want to install it
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yann@1048
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in your root file system. The install procedure of crosstool-NG honors the
|
yann@1048
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210 |
DESTDIR variable:
|
yann@1048
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211 |
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yann@1048
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212 |
./configure --prefix=/usr
|
yann@1048
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213 |
make
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rpjday@1291
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make DESTDIR=/packaging/place install
|
yann@1048
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215 |
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yann@837
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216 |
Shell completion |
|
yann@837
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217 |
-----------------+
|
yann@837
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218 |
|
yann@837
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219 |
crosstool-NG comes with a shell script fragment that defines bash-compatible
|
yann@837
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220 |
completion. That shell fragment is currently not installed automatically, but
|
yann@837
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221 |
this is planned.
|
yann@837
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222 |
|
yann@837
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223 |
To install the shell script fragment, you have two options:
|
yann@837
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224 |
- install system-wide, most probably by copying ct-ng.comp into
|
yann@837
|
225 |
/etc/bash_completion.d/
|
yann@837
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226 |
- install for a single user, by copying ct-ng.comp into ${HOME}/ and
|
yann@837
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sourcing this file from your ${HOME}/.bashrc
|
yann@837
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228 |
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yann@456
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Contributed code |
|
yann@456
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-----------------+
|
yann@456
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231 |
|
yann@456
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Some people contibuted code that couldn't get merged for various reasons. This
|
yann@1574
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code is available as lzma-compressed patches, in the contrib/ sub-directory.
|
yann@1574
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234 |
These patches are to be applied to the source of crosstool-NG, prior to
|
yann@1574
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235 |
installing, using something like the following:
|
yann@1574
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236 |
lzcat contrib/foobar.patch.lzma |patch -p1
|
yann@620
|
237 |
|
yann@620
|
238 |
There is no guarantee that a particuliar contribution applies to the current
|
yann@620
|
239 |
version of crosstool-ng, or that it will work at all. Use contributions at
|
yann@620
|
240 |
your own risk.
|
yann@620
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241 |
|
yann@1580
|
242 |
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yann@168
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243 |
____________________________
|
yann@168
|
244 |
/
|
yann@168
|
245 |
Configuring crosstool-NG /
|
yann@168
|
246 |
_________________________/
|
yann@168
|
247 |
|
yann@620
|
248 |
crosstool-NG is configured with a configurator presenting a menu-stuctured set
|
yann@620
|
249 |
of options. These options let you specify the way you want your toolchain
|
yann@620
|
250 |
built, where you want it installed, what architecture and specific processor it
|
yann@277
|
251 |
will support, the version of the components you want to use, etc... The
|
yann@277
|
252 |
value for those options are then stored in a configuration file.
|
yann@277
|
253 |
|
yann@476
|
254 |
The configurator works the same way you configure your Linux kernel. It is
|
yann@277
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255 |
assumed you now how to handle this.
|
yann@168
|
256 |
|
yann@168
|
257 |
To enter the menu, type:
|
yann@192
|
258 |
ct-ng menuconfig
|
yann@168
|
259 |
|
yann@203
|
260 |
Almost every config item has a help entry. Read them carefully.
|
yann@168
|
261 |
|
yann@168
|
262 |
String and number options can refer to environment variables. In such a case,
|
yann@192
|
263 |
you must use the shell syntax: ${VAR}. You shall neither single- nor double-
|
yann@294
|
264 |
quote the string/number options.
|
yann@168
|
265 |
|
yann@192
|
266 |
There are three environment variables that are computed by crosstool-NG, and
|
yann@168
|
267 |
that you can use:
|
yann@168
|
268 |
|
yann@168
|
269 |
CT_TARGET:
|
yann@335
|
270 |
It represents the target tuple you are building for. You can use it for
|
yann@168
|
271 |
example in the installation/prefix directory, such as:
|
yann@168
|
272 |
/opt/x-tools/${CT_TARGET}
|
yann@168
|
273 |
|
yann@168
|
274 |
CT_TOP_DIR:
|
yann@182
|
275 |
The top directory where crosstool-NG is running. You shouldn't need it in
|
yann@182
|
276 |
most cases. There is one case where you may need it: if you have local
|
yann@182
|
277 |
patches and you store them in your running directory, you can refer to them
|
yann@168
|
278 |
by using CT_TOP_DIR, such as:
|
yann@168
|
279 |
${CT_TOP_DIR}/patches.myproject
|
yann@168
|
280 |
|
yann@168
|
281 |
CT_VERSION:
|
yann@192
|
282 |
The version of crosstool-NG you are using. Not much use for you, but it's
|
yann@168
|
283 |
there if you need it.
|
yann@168
|
284 |
|
yann@168
|
285 |
Interesting config options |
|
yann@476
|
286 |
---------------------------+
|
yann@168
|
287 |
|
yann@168
|
288 |
CT_LOCAL_TARBALLS_DIR:
|
yann@277
|
289 |
If you already have some tarballs in a direcotry, enter it here. That will
|
yann@197
|
290 |
speed up the retrieving phase, where crosstool-NG would otherwise download
|
yann@168
|
291 |
those tarballs.
|
yann@168
|
292 |
|
yann@168
|
293 |
CT_PREFIX_DIR:
|
yann@168
|
294 |
This is where the toolchain will be installed in (and for now, where it
|
yann@437
|
295 |
will run from). Common use is to add the target tuple in the directory
|
yann@277
|
296 |
path, such as (see above):
|
yann@277
|
297 |
/opt/x-tools/${CT_TARGET}
|
yann@168
|
298 |
|
yann@168
|
299 |
CT_TARGET_VENDOR:
|
yann@168
|
300 |
An identifier for your toolchain, will take place in the vendor part of the
|
yann@335
|
301 |
target tuple. It shall *not* contain spaces or dashes. Usually, keep it
|
yann@168
|
302 |
to a one-word string, or use underscores to separate words if you need.
|
yann@168
|
303 |
Avoid dots, commas, and special characters.
|
yann@168
|
304 |
|
yann@168
|
305 |
CT_TARGET_ALIAS:
|
yann@168
|
306 |
An alias for the toolchian. It will be used as a prefix to the toolchain
|
yann@168
|
307 |
tools. For example, you will have ${CT_TARGET_ALIAS}-gcc
|
yann@168
|
308 |
|
yann@246
|
309 |
Also, if you think you don't see enough versions, you can try to enable one of
|
yann@246
|
310 |
those:
|
yann@246
|
311 |
|
yann@246
|
312 |
CT_OBSOLETE:
|
yann@246
|
313 |
Show obsolete versions or tools. Most of the time, you don't want to base
|
yann@246
|
314 |
your toolchain on too old a version (of gcc, for example). But at times, it
|
yann@246
|
315 |
can come handy to use such an old version for regression tests. Those old
|
yann@1300
|
316 |
versions are hidden behind CT_OBSOLETE. Those versions (or features) are so
|
yann@1300
|
317 |
marked because maintaining support for those in crosstool-NG would be too
|
yann@1300
|
318 |
costly, time-wise, and time is dear.
|
yann@246
|
319 |
|
yann@246
|
320 |
CT_EXPERIMENTAL:
|
yann@246
|
321 |
Show experimental versions or tools. Again, you might not want to base your
|
yann@246
|
322 |
toolchain on too recent tools (eg. gcc) for production. But if you need a
|
yann@246
|
323 |
feature present only in a recent version, or a new tool, you can find them
|
yann@1300
|
324 |
hidden behind CT_EXPERIMENTAL. Those versions (or features) did not (yet)
|
yann@1300
|
325 |
receive thorough testing in crosstool-NG, and/or are not mature enough to
|
yann@1300
|
326 |
be blindly trusted.
|
yann@246
|
327 |
|
yann@276
|
328 |
Re-building an existing toolchain |
|
yann@276
|
329 |
----------------------------------+
|
yann@276
|
330 |
|
yann@276
|
331 |
If you have an existing toolchain, you can re-use the options used to build it
|
yann@276
|
332 |
to create a new toolchain. That needs a very little bit of effort on your side
|
yann@894
|
333 |
but is quite easy. The options to build a toolchain are saved with the
|
yann@894
|
334 |
toolchain, and you can retrieve this configuration by running:
|
yann@1803
|
335 |
${CT_TARGET}-ct-ng.config
|
yann@276
|
336 |
|
yann@1803
|
337 |
An alternate method is to extract the configuration from a build.log file.
|
yann@1803
|
338 |
This will be necessary if your toolchain was build with crosstool-NG prior
|
yann@1803
|
339 |
to 1.4.0, but can be used with build.log files from any version:
|
yann@1803
|
340 |
ct-ng extractconfig <build.log >.config
|
yann@1803
|
341 |
|
yann@1803
|
342 |
Or, if your build.log file is compressed (most probably!):
|
yann@1803
|
343 |
bzcat build.log.bz2 |ct-ng extractconfig >.config
|
yann@1803
|
344 |
|
yann@1803
|
345 |
The above commands will dump the configuration to stdout, so to rebuild a
|
yann@1803
|
346 |
toolchain with this configuration, just redirect the output to the
|
yann@1803
|
347 |
.config file:
|
yann@1803
|
348 |
${CT_TARGET}-ct-ng.config >.config
|
yann@1098
|
349 |
ct-ng oldconfig
|
yann@276
|
350 |
|
yann@894
|
351 |
Then, you can review and change the configuration by running:
|
yann@894
|
352 |
ct-ng menuconfig
|
yann@276
|
353 |
|
yann@1842
|
354 |
Using as a backend for a build-system |
|
yann@1842
|
355 |
--------------------------------------+
|
yann@1842
|
356 |
|
yann@1842
|
357 |
Crosstool-NG can be used as a backend for an automated build-system. In this
|
yann@1842
|
358 |
case, some components that are expected to run on the target (eg. the native
|
yann@1842
|
359 |
gdb, ltrace, DUMA...) are not available in the menuconfig, and they are not
|
yann@1842
|
360 |
build either, as it is considered the responsibility of the build-system to
|
yann@1842
|
361 |
build its own versions of those tools.
|
yann@1842
|
362 |
|
yann@1842
|
363 |
If you want to use crosstool-NG as a backend to generate your toolchains for
|
yann@1842
|
364 |
your build-system, you have to set and export this environment variable:
|
yann@1842
|
365 |
CT_IS_A_BACKEND=y
|
yann@1842
|
366 |
|
yann@1842
|
367 |
(case is not sensitive, you can say Y).
|
yann@1842
|
368 |
|
yann@1580
|
369 |
|
yann@168
|
370 |
________________________
|
yann@168
|
371 |
/
|
yann@168
|
372 |
Running crosstool-NG /
|
yann@168
|
373 |
_____________________/
|
yann@1
|
374 |
|
yann@168
|
375 |
To build the toolchain, simply type:
|
yann@203
|
376 |
ct-ng build
|
yann@135
|
377 |
|
yann@135
|
378 |
This will use the above configuration to retrieve, extract and patch the
|
yann@135
|
379 |
components, build, install and eventually test your newly built toolchain.
|
yann@1
|
380 |
|
yann@1
|
381 |
You are then free to add the toolchain /bin directory in your PATH to use
|
yann@1
|
382 |
it at will.
|
yann@1
|
383 |
|
yann@135
|
384 |
In any case, you can get some terse help. Just type:
|
yann@192
|
385 |
ct-ng help
|
yann@203
|
386 |
or:
|
yann@203
|
387 |
man 1 ct-ng
|
yann@135
|
388 |
|
rpjday@436
|
389 |
Stopping and restarting a build |
|
yann@476
|
390 |
--------------------------------+
|
yann@135
|
391 |
|
yann@135
|
392 |
If you want to stop the build after a step you are debugging, you can pass the
|
yann@135
|
393 |
variable STOP to make:
|
fr@1643
|
394 |
ct-ng build STOP=some_step
|
yann@135
|
395 |
|
yann@135
|
396 |
Conversely, if you want to restart a build at a specific step you are
|
yann@135
|
397 |
debugging, you can pass the RESTART variable to make:
|
fr@1643
|
398 |
ct-ng build RESTART=some_step
|
yann@135
|
399 |
|
yann@136
|
400 |
Alternatively, you can call make with the name of a step to just do that step:
|
yann@192
|
401 |
ct-ng libc_headers
|
yann@136
|
402 |
is equivalent to:
|
fr@1643
|
403 |
ct-ng build RESTART=libc_headers STOP=libc_headers
|
yann@136
|
404 |
|
yann@304
|
405 |
The shortcuts +step_name and step_name+ allow to respectively stop or restart
|
yann@136
|
406 |
at that step. Thus:
|
fr@1643
|
407 |
ct-ng +libc_headers and: ct-ng libc_headers+
|
yann@136
|
408 |
are equivalent to:
|
fr@1643
|
409 |
ct-ng build STOP=libc_headers and: ct-ng build RESTART=libc_headers
|
yann@136
|
410 |
|
yann@181
|
411 |
To obtain the list of acceptable steps, please call:
|
yann@544
|
412 |
ct-ng list-steps
|
yann@181
|
413 |
|
yann@168
|
414 |
Note that in order to restart a build, you'll have to say 'Y' to the config
|
yann@168
|
415 |
option CT_DEBUG_CT_SAVE_STEPS, and that the previous build effectively went
|
yann@168
|
416 |
that far.
|
yann@92
|
417 |
|
yann@1025
|
418 |
Building all toolchains at once |
|
yann@1025
|
419 |
--------------------------------+
|
yann@92
|
420 |
|
yann@1025
|
421 |
You can build all samples; simply call:
|
yann@1025
|
422 |
ct-ng build-all
|
yann@40
|
423 |
|
yann@335
|
424 |
Overriding the number of // jobs |
|
yann@476
|
425 |
---------------------------------+
|
yann@335
|
426 |
|
yann@335
|
427 |
If you want to override the number of jobs to run in // (the -j option to
|
yann@335
|
428 |
make), you can either re-enter the menuconfig, or simply add it on the command
|
yann@335
|
429 |
line, as such:
|
yann@335
|
430 |
ct-ng build.4
|
yann@335
|
431 |
|
yann@335
|
432 |
which tells crosstool-NG to override the number of // jobs to 4.
|
yann@335
|
433 |
|
yann@335
|
434 |
You can see the actions that support overriding the number of // jobs in
|
yann@335
|
435 |
the help menu. Those are the ones with [.#] after them (eg. build[.#] or
|
yann@1025
|
436 |
build-all[.#], and so on...).
|
yann@1025
|
437 |
|
yann@1025
|
438 |
Note on // jobs |
|
yann@1025
|
439 |
----------------+
|
yann@1025
|
440 |
|
yann@1025
|
441 |
The crosstool-NG script 'ct-ng' is a Makefile-script. It does *not* execute
|
yann@1025
|
442 |
in parallel (there is not much to gain). When speaking of // jobs, we are
|
yann@1025
|
443 |
refering to the number of // jobs when making the *components*. That is, we
|
yann@1025
|
444 |
speak of the number of // jobs used to build gcc, glibc, and so on...
|
yann@1025
|
445 |
|
yann@1493
|
446 |
Tools wrapper |
|
yann@1493
|
447 |
--------------+
|
yann@1493
|
448 |
|
yann@1493
|
449 |
Starting with gcc-4.3 come two new dependencies: GMP and MPFR. With gcc-4.4,
|
yann@1493
|
450 |
come three new ones: GMP, PPL and CLooG/ppl. These are libraries that enable
|
yann@1493
|
451 |
advanced features to gcc. Additionally, some of the libraries can be used by
|
yann@1493
|
452 |
binutils and gdb. Unfortunately, not all systems on which crosstool-NG runs
|
yann@1493
|
453 |
have all of those libraries. And for those that do, the versions of those
|
yann@1493
|
454 |
libraries may be older than the version required by gcc.
|
yann@1493
|
455 |
|
yann@1493
|
456 |
This is why crosstool-NG builds its own set of libraries as part of the
|
yann@1493
|
457 |
toolchain.
|
yann@1493
|
458 |
|
yann@1493
|
459 |
The libraries are built as shared libraries, because building them as static
|
yann@1493
|
460 |
libraries has some short-comings. This poses no problem at build time, as
|
yann@1513
|
461 |
crosstool-NG correctly points gcc (and binutils and gdb) to the correct
|
yann@1493
|
462 |
place where our own version of the libraries are installed. But it poses
|
yann@1493
|
463 |
a problem when gcc et al. are run: the place where the libraries are is most
|
yann@1493
|
464 |
probably not known to the host dynamic linker. Still worse, if the host system
|
yann@1493
|
465 |
has its own versions, then ld.so would load the wrong library!
|
yann@1493
|
466 |
|
yann@1493
|
467 |
So we have to force the dynamic linker to load the correct version. We do this
|
yann@1493
|
468 |
by using the LD_LIBRARY_PATH variable, that informs the dynamic linker where
|
yann@1493
|
469 |
to look for shared libraries prior to searching its standard places. But we
|
yann@1493
|
470 |
can't impose that burden on all the system (because it'd be a nightmare to
|
yann@1513
|
471 |
configure, and because two toolchains on the same system may use different
|
yann@1493
|
472 |
versions of the libraries); so we have to do it on a per-toolchain basis.
|
yann@1493
|
473 |
|
yann@1493
|
474 |
So we rename all binaries of the toolchain (by adding a dot '.' as their first
|
yann@1493
|
475 |
character), and add a small program, the so-called "tools wrapper", that
|
yann@1493
|
476 |
correctly sets LD_LIBRARY_PATH prior to running the real tool.
|
yann@1493
|
477 |
|
yann@1493
|
478 |
First, the wrapper was written as a POSIX-compliant shell script. That shell
|
yann@1493
|
479 |
script is very simple, if not trivial, and works great. The only drawback is
|
yann@1493
|
480 |
that it does not work on host systems that lack a shell, for example the
|
yann@1493
|
481 |
MingW32 environment. To solve the issue, the wrapper has been re-written in C,
|
yann@1493
|
482 |
and compiled at build time. This C wrapper is much more complex than the shell
|
yann@1493
|
483 |
script, and although it sems to be working, it's been only lightly tested.
|
yann@1493
|
484 |
Some of the expected short-comings with this C wrapper are;
|
yann@1493
|
485 |
- multi-byte file names may not be handled correctly
|
yann@1493
|
486 |
- it's really big for what it does
|
yann@1493
|
487 |
|
yann@1493
|
488 |
So, the default wrapper installed with your toolchain is the shell script.
|
yann@1493
|
489 |
If you know that your system is missing a shell, then you shall use the C
|
yann@1493
|
490 |
wrapper (and report back whether it works, or does not work, for you).
|
yann@1493
|
491 |
|
yann@335
|
492 |
|
yann@227
|
493 |
_______________________
|
yann@227
|
494 |
/
|
yann@227
|
495 |
Using the toolchain /
|
yann@227
|
496 |
____________________/
|
yann@227
|
497 |
|
yann@227
|
498 |
Using the toolchain is as simple as adding the toolchain's bin directory in
|
yann@227
|
499 |
your PATH, such as:
|
yann@227
|
500 |
export PATH="${PATH}:/your/toolchain/path/bin"
|
yann@227
|
501 |
|
yann@335
|
502 |
and then using the target tuple to tell the build systems to use your
|
yann@227
|
503 |
toolchain:
|
yann@335
|
504 |
./configure --target=your-target-tuple
|
yann@294
|
505 |
or
|
yann@335
|
506 |
make CC=your-target-tuple-gcc
|
yann@294
|
507 |
or
|
yann@335
|
508 |
make CROSS_COMPILE=your-target-tuple-
|
yann@294
|
509 |
and so on...
|
yann@227
|
510 |
|
yann@476
|
511 |
It is strongly advised not to use the toolchain sys-root directory as an
|
yann@620
|
512 |
install directory for your programs/packages. If you do so, you will not be
|
yann@476
|
513 |
able to use your toolchain for another project. It is even strongly advised
|
yann@476
|
514 |
that your toolchain is chmod-ed to read-only once successfully build, so that
|
yann@620
|
515 |
you don't go polluting your toolchain with your programs/packages' files.
|
yann@476
|
516 |
|
yann@476
|
517 |
Thus, when you build a program/package, install it in a separate directory,
|
yann@476
|
518 |
eg. /your/root. This directory is the /image/ of what would be in the root file
|
yann@620
|
519 |
system of your target, and will contain all that your programs/packages have
|
yann@476
|
520 |
installed.
|
yann@476
|
521 |
|
Yann@1405
|
522 |
The 'populate' script |
|
Yann@1405
|
523 |
----------------------+
|
Yann@1405
|
524 |
|
yann@227
|
525 |
When your root directory is ready, it is still missing some important bits: the
|
yann@227
|
526 |
toolchain's libraries. To populate your root directory with those libs, just
|
yann@227
|
527 |
run:
|
yann@335
|
528 |
your-target-tuple-populate -s /your/root -d /your/root-populated
|
yann@227
|
529 |
|
yann@227
|
530 |
This will copy /your/root into /your/root-populated, and put the needed and only
|
yann@227
|
531 |
the needed libraries there. Thus you don't polute /your/root with any cruft that
|
yann@227
|
532 |
would no longer be needed should you have to remove stuff. /your/root always
|
yann@227
|
533 |
contains only those things you install in it.
|
yann@227
|
534 |
|
yann@227
|
535 |
You can then use /your/root-populated to build up your file system image, a
|
yann@227
|
536 |
tarball, or to NFS-mount it from your target, or whatever you need.
|
yann@227
|
537 |
|
Yann@1405
|
538 |
The populate script accepts the following options:
|
yann@294
|
539 |
|
Yann@1405
|
540 |
-s src_dir
|
Yann@1405
|
541 |
Use 'src_dir' as the un-populated root directory.
|
yann@294
|
542 |
|
Yann@1405
|
543 |
-d dst_dir
|
Yann@1405
|
544 |
Put the populated root directory in 'dst_dir'.
|
Yann@1405
|
545 |
|
Yann@1405
|
546 |
-l lib1 [...]
|
Yann@1405
|
547 |
Always add specified libraries.
|
Yann@1405
|
548 |
|
Yann@1405
|
549 |
-L file
|
Yann@1405
|
550 |
Always add libraries listed in 'file'.
|
yann@294
|
551 |
|
yann@294
|
552 |
-f
|
Yann@1405
|
553 |
Remove 'dst_dir' if it previously existed; continue even if any library
|
Yann@1405
|
554 |
specified with -l or -L is missing.
|
yann@294
|
555 |
|
yann@294
|
556 |
-v
|
yann@294
|
557 |
Be verbose, and tell what's going on (you can see exactly where libs are
|
yann@294
|
558 |
coming from).
|
yann@294
|
559 |
|
yann@294
|
560 |
-h
|
Yann@1405
|
561 |
Print the help.
|
Yann@1405
|
562 |
|
Yann@1405
|
563 |
See 'your-target-tuple-populate -h' for more information on the options.
|
yann@294
|
564 |
|
Yann@1406
|
565 |
Here is how populate works:
|
Yann@1406
|
566 |
|
Yann@1406
|
567 |
1) performs some sanity checks:
|
Yann@1406
|
568 |
- src_dir and dst_dir are specified
|
Yann@1406
|
569 |
- src_dir exists
|
Yann@1406
|
570 |
- unless forced, dst_dir does not exist
|
Yann@1406
|
571 |
- src_dir != dst_dir
|
Yann@1406
|
572 |
|
Yann@1406
|
573 |
2) copy src_dir to dst_dir
|
Yann@1406
|
574 |
|
Yann@1406
|
575 |
3) add forced libraries to dst_dir
|
Yann@1406
|
576 |
- build the list from -l and -L options
|
Yann@1406
|
577 |
- get forced libraries from the sysroot (see below for heuristics)
|
Yann@1406
|
578 |
- abort on the first missing library, unless -f is specified
|
Yann@1406
|
579 |
|
Yann@1406
|
580 |
4) add all missing libraries to dst_dir
|
Yann@1406
|
581 |
- scan dst_dir for every ELF files that are 'executable' or
|
Yann@1406
|
582 |
'shared object'
|
Yann@1406
|
583 |
- list the "NEEDED Shared library" fields
|
Yann@1406
|
584 |
- check if the library is already in dst_dir/lib or dst_dir/usr/lib
|
Yann@1406
|
585 |
- if not, get the library from the sysroot
|
Yann@1406
|
586 |
- if it's in sysroot/lib, copy it to dst_dir/lib
|
Yann@1406
|
587 |
- if it's in sysroot/usr/lib, copy it to dst_dir/usr/lib
|
Yann@1406
|
588 |
- in both cases, use the SONAME of the library to create the file
|
Yann@1406
|
589 |
in dst_dir
|
Yann@1406
|
590 |
- if it was not found in the sysroot, this is an error.
|
Yann@1406
|
591 |
|
yann@1580
|
592 |
|
yann@40
|
593 |
___________________
|
yann@40
|
594 |
/
|
yann@40
|
595 |
Toolchain types /
|
yann@40
|
596 |
________________/
|
yann@40
|
597 |
|
yann@40
|
598 |
There are four kinds of toolchains you could encounter.
|
yann@40
|
599 |
|
yann@40
|
600 |
First off, you must understand the following: when it comes to compilers there
|
yann@40
|
601 |
are up to four machines involved:
|
yann@40
|
602 |
1) the machine configuring the toolchain components: the config machine
|
yann@40
|
603 |
2) the machine building the toolchain components: the build machine
|
yann@40
|
604 |
3) the machine running the toolchain: the host machine
|
yann@203
|
605 |
4) the machine the toolchain is generating code for: the target machine
|
yann@40
|
606 |
|
yann@40
|
607 |
We can most of the time assume that the config machine and the build machine
|
yann@40
|
608 |
are the same. Most of the time, this will be true. The only time it isn't
|
yann@40
|
609 |
is if you're using distributed compilation (such as distcc). Let's forget
|
yann@40
|
610 |
this for the sake of simplicity.
|
yann@40
|
611 |
|
yann@40
|
612 |
So we're left with three machines:
|
yann@40
|
613 |
- build
|
yann@40
|
614 |
- host
|
yann@40
|
615 |
- target
|
yann@40
|
616 |
|
yann@40
|
617 |
Any toolchain will involve those three machines. You can be as pretty sure of
|
yann@40
|
618 |
this as "2 and 2 are 4". Here is how they come into play:
|
yann@40
|
619 |
|
yann@40
|
620 |
1) build == host == target
|
yann@40
|
621 |
This is a plain native toolchain, targetting the exact same machine as the
|
yann@40
|
622 |
one it is built on, and running again on this exact same machine. You have
|
yann@40
|
623 |
to build such a toolchain when you want to use an updated component, such
|
yann@40
|
624 |
as a newer gcc for example.
|
yann@197
|
625 |
crosstool-NG calls it "native".
|
yann@40
|
626 |
|
yann@40
|
627 |
2) build == host != target
|
yann@40
|
628 |
This is a classic cross-toolchain, which is expected to be run on the same
|
yann@40
|
629 |
machine it is compiled on, and generate code to run on a second machine,
|
yann@40
|
630 |
the target.
|
yann@197
|
631 |
crosstool-NG calls it "cross".
|
yann@40
|
632 |
|
yann@40
|
633 |
3) build != host == target
|
yann@40
|
634 |
Such a toolchain is also a native toolchain, as it targets the same machine
|
yann@40
|
635 |
as it runs on. But it is build on another machine. You want such a
|
yann@40
|
636 |
toolchain when porting to a new architecture, or if the build machine is
|
yann@40
|
637 |
much faster than the host machine.
|
yann@197
|
638 |
crosstool-NG calls it "cross-native".
|
yann@40
|
639 |
|
yann@40
|
640 |
4) build != host != target
|
yann@92
|
641 |
This one is called a canadian-toolchain (*), and is tricky. The three
|
yann@40
|
642 |
machines in play are different. You might want such a toolchain if you
|
yann@40
|
643 |
have a fast build machine, but the users will use it on another machine,
|
yann@40
|
644 |
and will produce code to run on a third machine.
|
yann@197
|
645 |
crosstool-NG calls it "canadian".
|
yann@40
|
646 |
|
yann@197
|
647 |
crosstool-NG can build all these kinds of toolchains (or is aiming at it,
|
yann@197
|
648 |
anyway!)
|
yann@40
|
649 |
|
yann@40
|
650 |
(*) The term Canadian Cross came about because at the time that these issues
|
yann@40
|
651 |
were all being hashed out, Canada had three national political parties.
|
yann@40
|
652 |
http://en.wikipedia.org/wiki/Cross_compiler
|
yann@40
|
653 |
|
yann@1551
|
654 |
|
yann@1575
|
655 |
________________
|
yann@1575
|
656 |
/
|
yann@1575
|
657 |
Contributing /
|
yann@1575
|
658 |
_____________/
|
yann@1575
|
659 |
|
yann@1575
|
660 |
Sending a bug report |
|
yann@1575
|
661 |
---------------------+
|
yann@1575
|
662 |
|
yann@1575
|
663 |
If you need to send a bug report, please send a mail with subject
|
yann@1575
|
664 |
prefixed with "[CT_NG]" with to following destinations:
|
yann@1575
|
665 |
TO: yann.morin.1998 (at) anciens.enib.fr
|
yann@1575
|
666 |
CC: crossgcc (at) sourceware.org
|
yann@1575
|
667 |
|
yann@1575
|
668 |
Sending patches |
|
yann@1575
|
669 |
----------------+
|
yann@1575
|
670 |
|
yann@1575
|
671 |
If you want to enhance crosstool-NG, there's a to-do list in the TODO file.
|
yann@1575
|
672 |
|
yann@1575
|
673 |
Patches should come with the appropriate SoB line. A SoB line is typically
|
yann@1575
|
674 |
something like:
|
yann@1575
|
675 |
Signed-off-by: John DOE <john.doe@somewhere.net>
|
yann@1575
|
676 |
|
yann@1575
|
677 |
The SoB line is clearly described in Documentation/SubmittingPatches , section
|
yann@1575
|
678 |
12, of your favourite Linux kernel source tree.
|
yann@1575
|
679 |
|
yann@1575
|
680 |
Then you'll need to correctly configure Mercurial. There are two extensions
|
yann@1575
|
681 |
that you may find usefull:
|
yann@1575
|
682 |
- mq : http://mercurial.selenic.com/wiki/MqExtension
|
yann@1575
|
683 |
- patchbomb : http://mercurial.selenic.com/wiki/PatchbombExtension
|
yann@1575
|
684 |
|
yann@1575
|
685 |
Commit messages should look like (without leading pipes):
|
yann@1575
|
686 |
|component: short, one-line description
|
yann@1575
|
687 |
|
|
yann@1575
|
688 |
|optional longer description
|
yann@1575
|
689 |
|on multiple lines if needed
|
yann@1575
|
690 |
|
yann@1575
|
691 |
Here is an example commit message (see revision a53a5e1d61db):
|
yann@1575
|
692 |
|comp-libs/cloog: fix building
|
yann@1575
|
693 |
|
|
yann@1575
|
694 |
|For CLooG/PPL 0.15.3, the directory name was simply cloog-ppl.
|
yann@1575
|
695 |
|For any later versions, the directory name does have the version, such as
|
yann@1575
|
696 |
|cloog-ppl-0.15.4.
|
yann@1575
|
697 |
|
yann@1575
|
698 |
Here's a typical hacking session:
|
yann@1575
|
699 |
hg clone http://ymorin.is-a-geek.org/hg/crosstool-ng crosstool-ng
|
yann@1575
|
700 |
cd crosstool-ng
|
yann@1575
|
701 |
hg qinit
|
yann@1575
|
702 |
hg qnew -D -U -e my_first_patch
|
yann@1575
|
703 |
*edit patch description*
|
yann@1575
|
704 |
*hack* *hack* *check* *fails* *hack* *hack* *check* *works*
|
yann@1575
|
705 |
hg qref -D -e
|
yann@1575
|
706 |
*edit patch description, serving as commit message*
|
yann@1575
|
707 |
hg qnew -D -U -e my_second_patch
|
yann@1575
|
708 |
*edit patch description*
|
yann@1575
|
709 |
*hack* *hack* *check* *fails* *hack* *hack* *check* *works*
|
yann@1575
|
710 |
hg qref -D -e
|
yann@1575
|
711 |
*edit patch description, serving as commit message*
|
yann@1575
|
712 |
hg email --outgoing --intro \
|
yann@1575
|
713 |
--from '"Your Full NAME" <your.email (at) your.domain>' \
|
yann@1575
|
714 |
--to '"Yann E. MORIN" <yann.morin.1998 (at) anciens.enib.fr>' \
|
yann@1575
|
715 |
--cc 'crossgcc (at) sourceware.org'
|
yann@1575
|
716 |
*edit introductory message*
|
yann@1575
|
717 |
*wait for feedback*
|
yann@1575
|
718 |
*re-send if no answer for a few days*
|
yann@1575
|
719 |
|
yann@1575
|
720 |
Note: replace '(at)' above with a plain '@'.
|
yann@1575
|
721 |
|
yann@1575
|
722 |
|
yann@1
|
723 |
_____________
|
yann@1
|
724 |
/
|
yann@1
|
725 |
Internals /
|
yann@1
|
726 |
__________/
|
yann@1
|
727 |
|
yann@92
|
728 |
Internally, crosstool-NG is script-based. To ease usage, the frontend is
|
yann@92
|
729 |
Makefile-based.
|
yann@92
|
730 |
|
yann@92
|
731 |
Makefile front-end |
|
yann@476
|
732 |
-------------------+
|
yann@92
|
733 |
|
yann@203
|
734 |
The entry point to crosstool-NG is the Makefile script "ct-ng". Calling this
|
yann@203
|
735 |
script with an action will act exactly as if the Makefile was in the current
|
yann@203
|
736 |
working directory and make was called with the action as rule. Thus:
|
yann@203
|
737 |
ct-ng menuconfig
|
yann@294
|
738 |
|
yann@203
|
739 |
is equivalent to having the Makefile in CWD, and calling:
|
yann@203
|
740 |
make menuconfig
|
yann@203
|
741 |
|
yann@203
|
742 |
Having ct-ng as it is avoids copying the Makefile everywhere, and acts as a
|
yann@203
|
743 |
traditional command.
|
yann@203
|
744 |
|
yann@203
|
745 |
ct-ng loads sub- Makefiles from the library directory $(CT_LIB_DIR), as set up
|
yann@203
|
746 |
at configuration time with ./configure.
|
yann@203
|
747 |
|
yann@437
|
748 |
ct-ng also searches for config files, sub-tools, samples, scripts and patches in
|
yann@203
|
749 |
that library directory.
|
yann@92
|
750 |
|
yann@294
|
751 |
Because of a stupid make behavior/bug I was unable to track down, implicit make
|
yann@294
|
752 |
rules are disabled: installing with --local would triger those rules, and mconf
|
yann@294
|
753 |
was unbuildable.
|
yann@294
|
754 |
|
yann@182
|
755 |
Kconfig parser |
|
yann@476
|
756 |
---------------+
|
yann@92
|
757 |
|
yann@965
|
758 |
The kconfig language is a hacked version, vampirised from the Linux kernel
|
yann@965
|
759 |
(http://www.kernel.org/), and (heavily) adapted to my needs.
|
yann@92
|
760 |
|
yann@1040
|
761 |
The list of the most notable changes (at least the ones I remember) follows:
|
yann@1040
|
762 |
- the CONFIG_ prefix has been replaced with CT_
|
yann@1040
|
763 |
- a leading | in prompts is skipped, and subsequent leading spaces are not
|
yann@1843
|
764 |
trimmed; otherwise leading spaces are silently trimmed
|
yann@1843
|
765 |
- removed the warning about undefined environment variable
|
yann@1040
|
766 |
|
yann@203
|
767 |
The kconfig parsers (conf and mconf) are not installed pre-built, but as
|
yann@203
|
768 |
source files. Thus you can have the directory where crosstool-NG is installed,
|
yann@203
|
769 |
exported (via NFS or whatever) and have clients with different architectures
|
yann@203
|
770 |
use the same crosstool-NG installation, and most notably, the same set of
|
yann@203
|
771 |
patches.
|
yann@203
|
772 |
|
yann@381
|
773 |
Architecture-specific |
|
yann@476
|
774 |
----------------------+
|
yann@381
|
775 |
|
yann@628
|
776 |
Note: this chapter is not really well written, and might thus be a little bit
|
yann@628
|
777 |
complex to understand. To get a better grasp of what an architecture is, the
|
yann@628
|
778 |
reader is kindly encouraged to look at the "arch/" sub-directory, and to the
|
yann@628
|
779 |
existing architectures to see how things are laid out.
|
yann@628
|
780 |
|
yann@381
|
781 |
An architecture is defined by:
|
yann@381
|
782 |
|
yann@381
|
783 |
- a human-readable name, in lower case letters, with numbers as appropriate.
|
yann@628
|
784 |
The underscore is allowed; space and special characters are not.
|
yann@628
|
785 |
Eg.: arm, x86_64
|
yann@903
|
786 |
- a file in "config/arch/", named after the architecture's name, and suffixed
|
yann@903
|
787 |
with ".in".
|
yann@903
|
788 |
Eg.: config/arch/arm.in
|
yann@903
|
789 |
- a file in "scripts/build/arch/", named after the architecture's name, and
|
yann@903
|
790 |
suffixed with ".sh".
|
yann@903
|
791 |
Eg.: scripts/build/arch/arm.sh
|
yann@628
|
792 |
|
yann@903
|
793 |
The architecture's ".in" file API:
|
yann@628
|
794 |
> the config option "ARCH_%arch%" (where %arch% is to be replaced with the
|
yann@628
|
795 |
actual architecture name).
|
yann@628
|
796 |
That config option must have *neither* a type, *nor* a prompt! Also, it can
|
yann@628
|
797 |
*not* depend on any other config option (EXPERIMENTAL is managed as above).
|
yann@628
|
798 |
Eg.:
|
yann@628
|
799 |
config ARCH_arm
|
yann@630
|
800 |
+ mandatory:
|
yann@702
|
801 |
defines a (terse) help entry for this architecture:
|
yann@630
|
802 |
Eg.:
|
yann@630
|
803 |
config ARCH_arm
|
yann@630
|
804 |
help
|
yann@630
|
805 |
The ARM architecture.
|
yann@628
|
806 |
+ optional:
|
yann@628
|
807 |
selects adequate associated config options.
|
yann@1038
|
808 |
Note: 64-bit architectures *shall* select ARCH_64
|
yann@628
|
809 |
Eg.:
|
yann@628
|
810 |
config ARCH_arm
|
yann@628
|
811 |
select ARCH_SUPPORTS_BOTH_ENDIAN
|
yann@628
|
812 |
select ARCH_DEFAULT_LE
|
yann@630
|
813 |
help
|
yann@630
|
814 |
The ARM architecture.
|
yann@1038
|
815 |
Eg.:
|
yann@1038
|
816 |
config ARCH_x86_64
|
yann@1038
|
817 |
select ARCH_64
|
yann@1038
|
818 |
help
|
yann@1038
|
819 |
The x86_64 architecture.
|
yann@628
|
820 |
|
yann@628
|
821 |
> other target-specific options, at your discretion. Note however that to
|
yann@628
|
822 |
avoid name-clashing, such options shall be prefixed with "ARCH_%arch%",
|
yann@628
|
823 |
where %arch% is again replaced by the actual architecture name.
|
yann@628
|
824 |
(Note: due to historical reasons, and lack of time to clean up the code,
|
yann@628
|
825 |
I may have left some config options that do not completely conform to
|
yann@628
|
826 |
this, as the architecture name was written all upper case. However, the
|
yann@628
|
827 |
prefix is unique among architectures, and does not cause harm).
|
yann@381
|
828 |
|
yann@903
|
829 |
The architecture's ".sh" file API:
|
yann@965
|
830 |
> the function "CT_DoArchTupleValues"
|
yann@381
|
831 |
+ parameters: none
|
yann@381
|
832 |
+ environment:
|
yann@901
|
833 |
- all variables from the ".config" file,
|
yann@901
|
834 |
- the two variables "target_endian_eb" and "target_endian_el" which are
|
yann@901
|
835 |
the endianness suffixes
|
yann@381
|
836 |
+ return value: 0 upon success, !0 upon failure
|
yann@381
|
837 |
+ provides:
|
yann@391
|
838 |
- mandatory
|
yann@383
|
839 |
- the environment variable CT_TARGET_ARCH
|
yann@389
|
840 |
- contains:
|
yann@389
|
841 |
the architecture part of the target tuple.
|
yann@389
|
842 |
Eg.: "armeb" for big endian ARM
|
yann@389
|
843 |
"i386" for an i386
|
yann@389
|
844 |
+ provides:
|
yann@391
|
845 |
- optional
|
yann@389
|
846 |
- the environment variable CT_TARGET_SYS
|
yann@456
|
847 |
- contains:
|
yann@383
|
848 |
the sytem part of the target tuple.
|
yann@383
|
849 |
Eg.: "gnu" for glibc on most architectures
|
yann@383
|
850 |
"gnueabi" for glibc on an ARM EABI
|
yann@383
|
851 |
- defaults to:
|
yann@383
|
852 |
- for glibc-based toolchain: "gnu"
|
yann@383
|
853 |
- for uClibc-based toolchain: "uclibc"
|
yann@383
|
854 |
+ provides:
|
yann@383
|
855 |
- optional
|
yann@767
|
856 |
- the environment variables to configure the cross-gcc (defaults)
|
yann@767
|
857 |
- CT_ARCH_WITH_ARCH : the gcc ./configure switch to select architecture level ( "--with-arch=${CT_ARCH_ARCH}" )
|
yann@767
|
858 |
- CT_ARCH_WITH_ABI : the gcc ./configure switch to select ABI level ( "--with-abi=${CT_ARCH_ABI}" )
|
yann@767
|
859 |
- CT_ARCH_WITH_CPU : the gcc ./configure switch to select CPU instruction set ( "--with-cpu=${CT_ARCH_CPU}" )
|
yann@767
|
860 |
- CT_ARCH_WITH_TUNE : the gcc ./configure switch to select scheduling ( "--with-tune=${CT_ARCH_TUNE}" )
|
yann@767
|
861 |
- CT_ARCH_WITH_FPU : the gcc ./configure switch to select FPU type ( "--with-fpu=${CT_ARCH_FPU}" )
|
yann@767
|
862 |
- CT_ARCH_WITH_FLOAT : the gcc ./configure switch to select floating point arithmetics ( "--with-float=soft" or /empty/ )
|
yann@391
|
863 |
+ provides:
|
yann@391
|
864 |
- optional
|
yann@767
|
865 |
- the environment variables to pass to the cross-gcc to build target binaries (defaults)
|
yann@391
|
866 |
- CT_ARCH_ARCH_CFLAG : the gcc switch to select architecture level ( "-march=${CT_ARCH_ARCH}" )
|
yann@456
|
867 |
- CT_ARCH_ABI_CFLAG : the gcc switch to select ABI level ( "-mabi=${CT_ARCH_ABI}" )
|
yann@391
|
868 |
- CT_ARCH_CPU_CFLAG : the gcc switch to select CPU instruction set ( "-mcpu=${CT_ARCH_CPU}" )
|
yann@391
|
869 |
- CT_ARCH_TUNE_CFLAG : the gcc switch to select scheduling ( "-mtune=${CT_ARCH_TUNE}" )
|
yann@391
|
870 |
- CT_ARCH_FPU_CFLAG : the gcc switch to select FPU type ( "-mfpu=${CT_ARCH_FPU}" )
|
yann@391
|
871 |
- CT_ARCH_FLOAT_CFLAG : the gcc switch to choose floating point arithmetics ( "-msoft-float" or /empty/ )
|
yann@391
|
872 |
- CT_ARCH_ENDIAN_CFLAG : the gcc switch to choose big or little endian ( "-mbig-endian" or "-mlittle-endian" )
|
yann@391
|
873 |
- default to:
|
yann@391
|
874 |
see above.
|
yann@767
|
875 |
+ provides:
|
yann@767
|
876 |
- optional
|
yann@767
|
877 |
- the environement variables to configure the core and final compiler, specific to this architecture:
|
yann@767
|
878 |
- CT_ARCH_CC_CORE_EXTRA_CONFIG : additional, architecture specific core gcc ./configure flags
|
yann@767
|
879 |
- CT_ARCH_CC_EXTRA_CONFIG : additional, architecture specific final gcc ./configure flags
|
yann@767
|
880 |
- default to:
|
yann@767
|
881 |
- all empty
|
yann@767
|
882 |
+ provides:
|
yann@767
|
883 |
- optional
|
yann@767
|
884 |
- the architecture-specific CFLAGS and LDFLAGS:
|
yann@767
|
885 |
- CT_ARCH_TARGET_CLFAGS
|
yann@767
|
886 |
- CT_ARCH_TARGET_LDFLAGS
|
yann@767
|
887 |
- default to:
|
yann@767
|
888 |
- all empty
|
yann@628
|
889 |
|
yann@903
|
890 |
You can have a look at "config/arch/arm.in" and "scripts/build/arch/arm.sh" for
|
yann@903
|
891 |
a quite complete example of what an actual architecture description looks like.
|
yann@901
|
892 |
|
yann@890
|
893 |
Kernel specific |
|
yann@890
|
894 |
----------------+
|
yann@890
|
895 |
|
yann@890
|
896 |
A kernel is defined by:
|
yann@890
|
897 |
|
yann@890
|
898 |
- a human-readable name, in lower case letters, with numbers as appropriate.
|
yann@890
|
899 |
The underscore is allowed; space and special characters are not (although
|
yann@890
|
900 |
they are internally replaced with underscores.
|
yann@890
|
901 |
Eg.: linux, bare-metal
|
yann@890
|
902 |
- a file in "config/kernel/", named after the kernel name, and suffixed with
|
yann@890
|
903 |
".in".
|
yann@890
|
904 |
Eg.: config/kernel/linux.in, config/kernel/bare-metal.in
|
yann@901
|
905 |
- a file in "scripts/build/kernel/", named after the kernel name, and suffixed
|
yann@901
|
906 |
with ".sh".
|
yann@901
|
907 |
Eg.: scripts/build/kernel/linux.sh, scripts/build/kernel/bare-metal.sh
|
yann@890
|
908 |
|
yann@890
|
909 |
The kernel's ".in" file must contain:
|
yann@890
|
910 |
> an optional lines containing exactly "# EXPERIMENTAL", starting on the
|
yann@890
|
911 |
first column, and without any following space or other character.
|
yann@890
|
912 |
If this line is present, then this kernel is considered EXPERIMENTAL,
|
yann@890
|
913 |
and correct dependency on EXPERIMENTAL will be set.
|
yann@901
|
914 |
|
yann@890
|
915 |
> the config option "KERNEL_%kernel_name%" (where %kernel_name% is to be
|
yann@890
|
916 |
replaced with the actual kernel name, with all special characters and
|
yann@890
|
917 |
spaces replaced by underscores).
|
yann@890
|
918 |
That config option must have *neither* a type, *nor* a prompt! Also, it can
|
yann@890
|
919 |
*not* depends on EXPERIMENTAL.
|
yann@890
|
920 |
Eg.: KERNEL_linux, KERNEL_bare_metal
|
yann@890
|
921 |
+ mandatory:
|
yann@890
|
922 |
defines a (terse) help entry for this kernel.
|
yann@890
|
923 |
Eg.:
|
yann@890
|
924 |
config KERNEL_bare_metal
|
yann@890
|
925 |
help
|
yann@890
|
926 |
Build a compiler for use without any kernel.
|
yann@890
|
927 |
+ optional:
|
yann@890
|
928 |
selects adequate associated config options.
|
yann@890
|
929 |
Eg.:
|
yann@890
|
930 |
config KERNEL_bare_metal
|
yann@890
|
931 |
select BARE_METAL
|
yann@890
|
932 |
help
|
yann@890
|
933 |
Build a compiler for use without any kernel.
|
yann@890
|
934 |
|
yann@890
|
935 |
> other kernel specific options, at your discretion. Note however that, to
|
yann@890
|
936 |
avoid name-clashing, such options should be prefixed with
|
yann@890
|
937 |
"KERNEL_%kernel_name%", where %kernel_name% is again tp be replaced with
|
yann@890
|
938 |
the actual kernel name.
|
yann@890
|
939 |
(Note: due to historical reasons, and lack of time to clean up the code,
|
yann@890
|
940 |
I may have left some config options that do not completely conform to
|
yann@890
|
941 |
this, as the kernel name was written all upper case. However, the prefix
|
yann@890
|
942 |
is unique among kernels, and does not cause harm).
|
yann@890
|
943 |
|
yann@901
|
944 |
The kernel's ".sh" file API:
|
yann@901
|
945 |
> is a bash script fragment
|
yann@901
|
946 |
|
yann@965
|
947 |
> defines the function CT_DoKernelTupleValues
|
yann@965
|
948 |
+ see the architecture's CT_DoArchTupleValues, except for:
|
yann@965
|
949 |
+ set the environment variable CT_TARGET_KERNEL, the kernel part of the
|
yann@965
|
950 |
target tuple
|
yann@965
|
951 |
+ return value: ignored
|
yann@965
|
952 |
|
yann@901
|
953 |
> defines the function "do_kernel_get":
|
yann@901
|
954 |
+ parameters: none
|
yann@901
|
955 |
+ environment:
|
yann@901
|
956 |
- all variables from the ".config" file.
|
yann@901
|
957 |
+ return value: 0 for success, !0 for failure.
|
yann@901
|
958 |
+ behavior: download the kernel's sources, and store the tarball into
|
yann@901
|
959 |
"${CT_TARBALLS_DIR}". To this end, a functions is available, that
|
yann@901
|
960 |
abstracts downloading tarballs:
|
yann@901
|
961 |
- CT_DoGet <tarball_base_name> <URL1 [URL...]>
|
yann@901
|
962 |
Eg.: CT_DoGet linux-2.6.26.5 ftp://ftp.kernel.org/pub/linux/kernel/v2.6
|
yann@901
|
963 |
Note: retrieving sources from svn, cvs, git and the likes is not supported
|
yann@901
|
964 |
by CT_DoGet. You'll have to do this by hand, as it is done for eglibc in
|
yann@901
|
965 |
"scripts/build/libc/eglibc.sh"
|
yann@901
|
966 |
|
yann@901
|
967 |
> defines the function "do_kernel_extract":
|
yann@901
|
968 |
+ parameters: none
|
yann@901
|
969 |
+ environment:
|
yann@901
|
970 |
- all variables from the ".config" file,
|
yann@901
|
971 |
+ return value: 0 for success, !0 for failure.
|
yann@901
|
972 |
+ behavior: extract the kernel's tarball into "${CT_SRC_DIR}", and apply
|
yann@901
|
973 |
required patches. To this end, a function is available, that abstracts
|
yann@901
|
974 |
extracting tarballs:
|
yann@901
|
975 |
- CT_ExtractAndPatch <tarball_base_name>
|
yann@901
|
976 |
Eg.: CT_ExtractAndPatch linux-2.6.26.5
|
yann@901
|
977 |
|
yann@901
|
978 |
> defines the function "do_kernel_headers":
|
yann@901
|
979 |
+ parameters: none
|
yann@901
|
980 |
+ environment:
|
yann@901
|
981 |
- all variables from the ".config" file,
|
yann@901
|
982 |
+ return value: 0 for success, !0 for failure.
|
yann@901
|
983 |
+ behavior: install the kernel headers (if any) in "${CT_SYSROOT_DIR}/usr/include"
|
yann@901
|
984 |
|
yann@901
|
985 |
> defines any kernel-specific helper functions
|
yann@901
|
986 |
These functions, if any, must be prefixed with "do_kernel_%CT_KERNEL%_",
|
yann@901
|
987 |
where '%CT_KERNEL%' is to be replaced with the actual kernel name, to avoid
|
yann@901
|
988 |
any name-clashing.
|
yann@901
|
989 |
|
yann@901
|
990 |
You can have a look at "config/kernel/linux.in" and "scripts/build/kernel/linux.sh"
|
yann@903
|
991 |
as an example of what a complex kernel description looks like.
|
yann@901
|
992 |
|
yann@620
|
993 |
Adding a new version of a component |
|
yann@476
|
994 |
------------------------------------+
|
yann@476
|
995 |
|
yann@476
|
996 |
When a new component, such as the Linux kernel, gcc or any other is released,
|
yann@476
|
997 |
adding the new version to crosstool-NG is quite easy. There is a script that
|
yann@476
|
998 |
will do all that for you:
|
yann@1095
|
999 |
scripts/addToolVersion.sh
|
yann@476
|
1000 |
|
yann@476
|
1001 |
Run it with no option to get some help.
|
yann@381
|
1002 |
|
yann@203
|
1003 |
Build scripts |
|
yann@476
|
1004 |
--------------+
|
yann@203
|
1005 |
|
yann@203
|
1006 |
To Be Written later...
|