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-File.........: 3 - Configuring a toolchain.txt
-Copyright....: (C) 2010 Yann E. MORIN <yann.morin.1998@free.fr>
-License......: Creative Commons Attribution Share Alike (CC-by-sa), v2.5
-
-
-
-Configuring crosstool-NG  /
-_________________________/
-
-
-crosstool-NG is configured with a configurator presenting a menu-structured set
-of options. These options let you specify the way you want your toolchain
-built, where you want it installed, what architecture and specific processor it
-will support, the version of the components you want to use, etc... The
-value for those options are then stored in a configuration file.
-
-The configurator works the same way you configure your Linux kernel. It is
-assumed you know how to handle this.
-
-To enter the menu, type:
-  ct-ng menuconfig
-
-Almost every config item has a help entry. Read them carefully.
-
-String and number options can refer to environment variables. In such a case,
-you must use the shell syntax: ${VAR}. You shall neither single- nor double-
-quote the string/number options.
-
-There are three environment variables that are computed by crosstool-NG, and
-that you can use:
-
-CT_TARGET:
-  It represents the target tuple you are building for. You can use it for
-  example in the installation/prefix directory, such as:
-    /opt/x-tools/${CT_TARGET}
-
-CT_TOP_DIR:
-  The top directory where crosstool-NG is running. You shouldn't need it in
-  most cases. There is one case where you may need it: if you have local
-  patches and you store them in your running directory, you can refer to them
-  by using CT_TOP_DIR, such as:
-    ${CT_TOP_DIR}/patches.myproject
-
-CT_VERSION:
-  The version of crosstool-NG you are using. Not much use for you, but it's
-  there if you need it.
-
-
-Interesting config options |
----------------------------+
-
-CT_LOCAL_TARBALLS_DIR:
-  If you already have some tarballs in a directory, enter it here. That will
-  speed up the retrieving phase, where crosstool-NG would otherwise download
-  those tarballs.
-
-CT_PREFIX_DIR:
-  This is where the toolchain will be installed in (and for now, where it
-  will run from). Common use is to add the target tuple in the directory
-  path, such as (see above):
-    /opt/x-tools/${CT_TARGET}
-
-CT_TARGET_VENDOR:
-  An identifier for your toolchain, will take place in the vendor part of the
-  target tuple. It shall *not* contain spaces or dashes. Usually, keep it
-  to a one-word string, or use underscores to separate words if you need.
-  Avoid dots, commas, and special characters.
-
-CT_TARGET_ALIAS:
-  An alias for the toolchain. It will be used as a prefix to the toolchain
-  tools. For example, you will have ${CT_TARGET_ALIAS}-gcc
-
-Also, if you think you don't see enough versions, you can try to enable one of
-those:
-
-CT_OBSOLETE:
-  Show obsolete versions or tools. Most of the time, you don't want to base
-  your toolchain on too old a version (of gcc, for example). But at times, it
-  can come handy to use such an old version for regression tests. Those old
-  versions are hidden behind CT_OBSOLETE. Those versions (or features) are so
-  marked because maintaining support for those in crosstool-NG would be too
-  costly, time-wise, and time is dear.
-
-CT_EXPERIMENTAL:
-  Show experimental versions or tools. Again, you might not want to base your
-  toolchain on too recent tools (eg. gcc) for production. But if you need a
-  feature present only in a recent version, or a new tool, you can find them
-  hidden behind CT_EXPERIMENTAL. Those versions (or features) did not (yet)
-  receive thorough testing in crosstool-NG, and/or are not mature enough to
-  be blindly trusted.
-
-
-Re-building an existing toolchain |
-----------------------------------+
-
-If you have an existing toolchain, you can re-use the options used to build it
-to create a new toolchain. That needs a very little bit of effort on your side
-but is quite easy. The options to build a toolchain are saved with the
-toolchain, and you can retrieve this configuration by running:
-  ${CT_TARGET}-ct-ng.config
-
-An alternate method is to extract the configuration from a build.log file.
-This will be necessary if your toolchain was build with crosstool-NG prior
-to 1.4.0, but can be used with build.log files from any version:
-  ct-ng extractconfig <build.log >.config
-
-Or, if your build.log file is compressed (most probably!):
-  bzcat build.log.bz2 |ct-ng extractconfig >.config
-
-The above commands will dump the configuration to stdout, so to rebuild a
-toolchain with this configuration, just redirect the output to the
-.config file:
-  ${CT_TARGET}-ct-ng.config >.config
-  ct-ng oldconfig
-
-Then, you can review and change the configuration by running:
-  ct-ng menuconfig