Multiple build configurations? about buck2 HOT 3 OPEN

There is a single toolchain toolchains//:cxx that is used for all C++ compilations. You can. use either selects or .buckconfig to change what it points at. You could make the toolchains//:cxx an alias with a select statement, or you could call read_config to grab the config and populate the fields from there. Internally we use a select for the outer structure and then read_config for the inner details - but that's not necessarily the recommended approach, where select only would be advised. I'm just not sure if we have all the pieces set up to support that - e.g. the configuration RFC. CC @stepancheg who might know.

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Thanks, this looks very helpful.
Great podcast episode, by the way :)

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We have an example where we create a toolchain alias with select that might be of interest to you.

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