Add support for cargo-readelf command

[rruuaanng]

Allows developers to use the cargo readelf sub-command.

Fixes: #89

[diondokter]

Cool! I'd love this. But I will note that readelf is not available in the llvm-tools for windows.

[9names]

Weird to have a PR that closes itself on merge. Did you mean to write "fixes #89"?

[rruuaanng]

Weird to have a PR that closes itself on merge. Did you mean to write "fixes #89"?

Yes!
(It looks like I screwed up.)

[rruuaanng]

Cool! I'd love this. But I will note that readelf is not available in the llvm-tools for windows.

D:\LLVM>cmd
Microsoft Windows [Version 10.0.26200.7840]
(c)Microsoft Corporation. All rights reserved.

D:\LLVM>llvm-readelf --version
LLVM (http://llvm.org/):
  LLVM version 20.1.8
  Optimized build.

D:\LLVM>llvm-readobj --version
LLVM (http://llvm.org/):
  LLVM version 20.1.8
  Optimized build.

Looks good :)

[diondokter]

That's weird...? I don't have it. Just updated LLVM to the newest version 21 and I still don't have it.
The llvm-tools distributed by Rust (called rust-objcopy etc.) also don't have a readelf.

So, one of us has a weird installation :)

[rruuaanng]

cc @eldruin @BartMassey

[Emilgardis]

llvm-readelf is not included in the llvm-tools component:
https://github.com/rust-lang/rust/blob/28b5c1cc084d3d21168f034b39c23193a9a7f127/src/bootstrap/src/lib.rs#L62-L77

[BartMassey]

Looks like the path of least resistance is to change this to be cargo-readobj. With --elf-output-style=GNU it probably will be pretty usable?

[rruuaanng]

Looks like the path of least resistance is to change this to be cargo-readobj. With --elf-output-style=GNU it probably will be pretty usable?

I think that great. In this way, we are only providing one alias.

[BartMassey]

Sounds good. Go ahead and update the PR and I'll take a look at it. Thanks for working on this.