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diff --git a/documentation/dev-manual/external-toolchain.rst b/documentation/dev-manual/external-toolchain.rst new file mode 100644 index 0000000000..238f8cf467 --- /dev/null +++ b/documentation/dev-manual/external-toolchain.rst @@ -0,0 +1,40 @@ +.. SPDX-License-Identifier: CC-BY-SA-2.0-UK + +Optionally Using an External Toolchain +************************************** + +You might want to use an external toolchain as part of your development. +If this is the case, the fundamental steps you need to accomplish are as +follows: + +- Understand where the installed toolchain resides. For cases where you + need to build the external toolchain, you would need to take separate + steps to build and install the toolchain. + +- Make sure you add the layer that contains the toolchain to your + ``bblayers.conf`` file through the + :term:`BBLAYERS` variable. + +- Set the :term:`EXTERNAL_TOOLCHAIN` variable in your ``local.conf`` file + to the location in which you installed the 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 Mentor Graphics Sourcery G++ Toolchain. Support for this toolchain resides +in the separate ``meta-sourcery`` layer at +https://github.com/MentorEmbedded/meta-sourcery/. +See its ``README`` file for details about how to use this layer. + +Another example of external toolchain layer is +:yocto_git:`meta-arm-toolchain </meta-arm/tree/meta-arm-toolchain/>` +supporting GNU toolchains released by ARM. + +You can find further information by reading about the :term:`TCMODE` variable +in the Yocto Project Reference Manual's variable glossary. |