documentation/poky-ref-manual/faq.xml: Added new FAQ entry x-toolchain
Added a new FAQ entry per Richard Purdie answering the question 'How do I use an external toolchain?' (From yocto-docs rev: 58b78df0d78637234cbcb0e70e225b72ba0f9a2b) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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</answer>
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</answer>
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</qandaentry>
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</qandaentry>
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<qandaentry>
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<question>
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<para>
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How do I use an external toolchain?
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</para>
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</question>
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<answer>
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<para>
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The toolchain configuration is very flexible and customizable.
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It is primarily controlled with the TCMODE variable.
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This variable controls which file to include
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(<filename>conf/distro/include/tcmode-*.inc</filename>).
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</para>
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<para>
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The default value of TCMODE is "default".
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However, other patterns are accepted.
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In particular, "external-*" refers to external toolchains of which there are some basic examples
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included with the core.
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A user can use their own custom toolchain definition in their own layer
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(or <filename>local.conf</filename> directory) at the location
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<filename>conf/distro/include/tcmode-*.inc</filename>.
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</para>
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<para>
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In addition to the toolchain configuration, you also need a corresponding toolchain recipe file.
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This recipe file needs to package up any pre-built objects in the toolchain such as
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<filename>libgcc</filename>, <filename>libstdcc++</filename>,
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any locales and <filename>libc</filename>.
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An example is the <filename>external-csl-toolchain_2008q3-72.bb</filename>, which reuses the core
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<filename>libc</filename> packaging class to do most of the work.
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</para>
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</answer>
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</qandaentry>
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