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ref-manual: Updated the TCMODE variable description.

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(From yocto-docs rev: 96fa2af5161307c839e61d835937812da22f8158)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2013-12-13 12:31:28 -06:00
committed by Richard Purdie
parent 2c9475edcc
commit 5dd83ad7e3
1 changed files with 34 additions and 14 deletions
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documentation/ref-manual/ref-variables.xml
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@@ -6532,25 +6532,45 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
<glossentry id='var-TCMODE'><glossterm>TCMODE</glossterm>
<glossdef>
<para>
The toolchain selector.
This variable replaces <filename>POKYMODE</filename>, which is no longer
supported.
Specifies the toolchain selector.
<filename>TCMODE</filename> controls the characteristics
of the generated packages and images by telling the
OpenEmbedded build system which toolchain profile to use.
By default, the OpenEmbedded build system builds its own
internal toolchain.
The variable's default value is "default", which uses
that internal toolchain.
</para>
<para>
The <filename>TCMODE</filename> variable selects the external toolchain
built using the OpenEmbedded build system or a few supported combinations of
the upstream GCC or CodeSourcery Labs toolchain.
The variable identifies the <filename>tcmode-*</filename> files used in
the <filename>meta/conf/distro/include</filename> directory, which is found in the
<ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
With additional layers, it is possible to use a pre-compiled
external toolchain.
One example is the Sourcery G++ Toolchain.
The support for this toolchain resides in the separate
<filename>meta-sourcery</filename> layer at
<ulink url='http://github.com/MentorEmbedded/meta-sourcery/'></ulink>.
You can use <filename>meta-sourcery</filename> as a
template for adding support for other external toolchains.
</para>
<para>
The <filename>TCMODE</filename> variable points the build
system to a file in
<filename>conf/distro/include/tcmode-${TCMODE}.inc</filename>.
Thus, for <filename>meta-sourcery</filename>,
which has <filename>conf/distro/include/tcmode-external-sourcery.inc</filename>,
you would set the variable as follows:
<literallayout class='monospaced'>
TCMODE ?= "external-sourcery"
</literallayout>
</para>
<para>
By default, <filename>TCMODE</filename> is set to "default", which
chooses the <filename>tcmode-default.inc</filename> file.
The variable is similar to
<link linkend='var-TCLIBC'><filename>TCLIBC</filename></link>, which controls
the variant of the GNU standard C library (<filename>libc</filename>)
used during the build process: <filename>eglibc</filename> or <filename>uclibc</filename>.
<link linkend='var-TCLIBC'><filename>TCLIBC</filename></link>,
which controls the variant of the GNU standard C library
(<filename>libc</filename>) used during the build process:
<filename>eglibc</filename> or <filename>uclibc</filename>.
</para>
</glossdef>
</glossentry>