Conditional RUSTFLAGS in .cargo/config?

[jerryc05]

Describe the problem you are trying to solve

I know that there is a [build] section in .cargo/config file that accepts rustflags, but the problem is, it is effective all the time.

I would like to use some rustflags ONLY under several profiles separately. For example, it would be best if there exists something equivalent to:

[build.dev]
rustflags = [
    "-Ctarget-cpu=native",
    # some other flags
]

Note that I only want those flags under RELEASE builds, and they shall have no effect under DEV builds.

Describe the solution you'd like

Probably a [build.dev] section?

Notes

[jerryc05]

Oops, just found a possible dup of this issue #7878 . Anyway, are we making progress on this feature request?

[ehuss]

Closing as a duplicate of #7878.