Allow use with Cargo's "build-std" feature about cargo-bloat HOT 6 CLOSED

I just have to support -Z flags. That's it.

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cargo-bloat simply doesn't support -Z options. Not sure how hard it would be to implement them.

As a workaround, you can simply use RUSTFLAGS env.

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Yes, I was hoping cargo-bloat could be extended to support passing along nightly cargo options directly. That would fix this case, as well as any future cases of nightly options.

I don't see how to use RUSTFLAGS as a work-around. The -Z build-std flags are for Cargo; they cause Cargo to compile the Rust standard library from source. Isn't RUSTFLAGS for rustc options? I'd looked for a similar environment variable for Cargo, but couldn't find it. I could see a hypothetical CARGOFLAGS being a work-around, though. Am I missing something?

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I'll see what I can do.

No idea. I haven't used build-std yet.

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Thanks :-) Yeah, build-std is pretty new, but it's already very usable. I do have the cargo shim work-around mentioned earlier, so with some awkwardness I can still use cargo-bloat with build-std (which is good, since cargo-bloat has been a very helpful tool in the pursuit of smaller executables).

from cargo-bloat.

Ran into the same issue, wanted to share my workaround in case it helps. You can add some variation of the following to your .cargo/config.toml (can be project-specific or a global setting):

[unstable]
build-std=["core","std","alloc","proc_macro","panic_abort"]
build-std-features=["panic_immediate_abort"]

Then you can run cargo bloat as normal, and std will be built from source.

More generally, maybe a blurb on using cargo's config.toml should be added to this project's README.md? There's potentially several usecases for which this would be easier to support than additional command line flags.

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