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manual: improve documentation about using external toolchains

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- Remove the redundant FAQ entry about this topic,
  already covered in a specific section of the Development Tasks manual

- Document the TOOLCHAIN_LOCATION variable

- Expand both the Development Tasks manual and
  the TCMODE variable description using details from the FAQ entry.

- Mention the "meta-arm-toolchain" layer too.

(From yocto-docs rev: 53faa54a8e6311b4d3d41d96cb1a497d0f6502fb)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Michael Opdenacker
2022-12-08 19:10:01 +01:00
committed by Richard Purdie
parent 397586e4ae
commit 766a44b8e3
3 changed files with 37 additions and 30 deletions
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documentation/ref-manual/variables.rst
+15 -5
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@@ -2417,6 +2417,12 @@ system and gives an overview of their function and contents.
:ref:`kernel-yocto <ref-classes-kernel-yocto>` class in
``meta/classes-recipe`` to see how the variable is used.
:term:`EXTERNAL_TOOLCHAIN`
When you intend to use an
:ref:`external toolchain <dev-manual/external-toolchain:optionally using an external toolchain>`,
this variable allows to specify the directory where this toolchain was
installed.
:term:`EXTERNALSRC`
When inheriting the :ref:`externalsrc <ref-classes-externalsrc>`
class, this variable points to the source tree, which is outside of
@@ -8475,16 +8481,20 @@ system and gives an overview of their function and contents.
https://github.com/MentorEmbedded/meta-sourcery/.
The layer's ``README`` file contains information on how to use the
Sourcery G++ Toolchain as an external toolchain. In summary, you must
be sure to add the layer to your ``bblayers.conf`` file in front of
the ``meta`` layer and then set the ``EXTERNAL_TOOLCHAIN`` variable
in your ``local.conf`` file to the location in which you installed
the toolchain.
Sourcery G++ Toolchain as an external toolchain. You will have to
add the layer to your ``bblayers.conf`` file and then set the
:term:`EXTERNAL_TOOLCHAIN` variable in your ``local.conf`` file to
the location of the toolchain.
The fundamentals used for this example apply to any external
toolchain. You can use ``meta-sourcery`` as a template for adding
support for other external toolchains.
In addition to toolchain configuration, you will also need a
corresponding toolchain recipe file. This recipe file needs to package
up any pre-built objects in the toolchain such as ``libgcc``,
``libstdcc++``, any locales, and ``libc``.
:term:`TC_CXX_RUNTIME`
Specifies the C/C++ STL and runtime variant to use during
the build process. Default value is 'gnu'