Useless warning about cache on Termux

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Termux is a Linux environment on Android. It has the latest Rust in its repository. However, when compiling, I always get

warning: hard linking files in the incremental compilation cache failed. copying files instead. consider moving the cache directory to a file system which supports hard linking in session dir

Termux can only offer what Google or Samsung allow it to. And such a file system is not there. This means the message is kinda wrong and certainly annoying. Especially when trying things on the road, where I have to use the built in screen. This takes up more than a third of available screen space when the keyboard is showing.

As this is a rare environment in the broad Rust world, automatic detection of such file systems would be overblown. But some way of turning it off manually, would be welcome.

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There's an existing issue here: Filesystem warning supress-ability · Issue #75997 · rust-lang/rust · GitHub

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I don't have a environment to test this, but does it help if you turn off incremental compilation? this can be done using cargo profile setting or environment variable. see:

https://doc.rust-lang.org/cargo/reference/profiles.html#incremental

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That issue seems to be stuck. But

export RUSTFLAGS='-C incremental="false"'

did remove it. Thanks!

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