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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/faq.rst
+2 -17
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@@ -168,23 +168,8 @@ Using the OpenEmbedded Build system
How do I use an external toolchain?
-----------------------------------
The toolchain configuration is very flexible and customizable. It
is primarily controlled with the :term:`TCMODE` variable. This variable
controls which ``tcmode-*.inc`` file to include from the
``meta/conf/distro/include`` directory within the :term:`Source Directory`.
The default value of :term:`TCMODE` is "default", which tells the
OpenEmbedded build system to use its internally built toolchain (i.e.
``tcmode-default.inc``). However, other patterns are accepted. In
particular, "external-\*" refers to external toolchains. One example is
the Sourcery G++ Toolchain. The support for this toolchain resides in
the separate ``meta-sourcery`` layer at
https://github.com/MentorEmbedded/meta-sourcery/.
In addition to the toolchain configuration, you 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``.
See the ":ref:`dev-manual/external-toolchain:optionally using an external toolchain`"
section in the Development Task manual.
Why do I get chmod permission issues?
-------------------------------------