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In #1459, `extra_toolchain` was changed from a string to a Label. This was necessary (it's no longer safe to pass labels as strings in the post-bzlmod world) but it created a problem: the ability to do ``` cmake_variant(toolchain=select({"A": "footoolchain", "B": ""})) ``` Kind of worked before, and no longer does (since "" is not a valid label). This change makes it so you can pass None instead of "" and it will do roughly what "" did.
fmeum
approved these changes
Feb 20, 2026
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In #1459,
extra_toolchainwas changed from a string to a Label. This was necessary (it's no longer safe to pass labels as strings in the post-bzlmod world) but it created a problem: the ability to dokind of worked before, and no longer does (since "" is not a valid label). This change makes it so you can pass None instead of "" and it will do roughly what "" did.