Currently if you flip a feature like --features=tsan that affects compilation, any host / exec tools you depend on for your build will be recompiled with the tsan features, even though you likely only care about that for your target build, not your host tools.

I think there should be some way to separate these, for example having --features only apply to your target configuration and having a separate --host_features for the host / exec configuration similar to --copt and --host_copt (I'm sure there are many other potential solutions to this though)

Have you found anything relevant by searching the web?

I really thought there was a tracking issue for this somewhere, but here are some slightly related issues:

• Restore host and nonhost toolchain features (reversing #7407) #13315
• Replace hard-coded -g0 flags with a feature that can be used in the toolchain configuration. #13308
• Generic --host_opt flag #13048