Bazel 的`repository_rule` 如何调整`label_flag`（或者更普遍的`config_setting`）？

Question

I can create a label_flag in Bazel to allow command line flags to in turn be matched with a config_setting in a Bazel BUILD file.

However, I'd like to not hard-code the default value of the label_flag , and instead compute a good default based on the system when evaluating a repository_rule (or some other part of the WORKSPACE file).

The best (but awful) way I've come up with to do this is to have the default value loaded from a .bzl file that is generated using the template function on the repository_ctx .

I feel like generating a new file by doing textual substitutions probably isn't the right way to do this, but I can't find anything else. Ideas? help?

Answer 1

Generating a bzl file using the repository rule that inspects the host system is the only way to achieve what you need right now. So you're holding it "right" :)