feat(`compilation`): allow selective compilation of sources with `--via-ir`, running tests and scripts without

[zerosnacks]

Component

Forge

Describe the feature you would like

In a basic scenario I was able to selectively compile with --via-ir as follows using the --skip flag:

$ forge build --via-ir --skip tests scripts

or this should work in foundry.toml:

[profile.via-ir]
via-ir = true
skip = ["test/*", "script/*"]

[profile.test]
skip = ["src/*"]

and then:

$ FOUNDRY_PROFILE=via-ir forge build
$ FOUNDRY_PROFILE=test forge test

This appears to work in a basic Counter example but appears to not work in all cases e.g. https://github.com/uniswap/v4-core

cc @klkvr is there a better way to do this?

Additional context

Related: https://x.com/0xKaden/status/1846606449977532748 + https://x.com/emo_eth/status/1846645499358859469

[klkvr]

$ FOUNDRY_PROFILE=via-ir forge build
$ FOUNDRY_PROFILE=test forge test

this would work only if project is only deploying contracts through deployCode, otherwise during tests compilation contracts would still get compiled without via-ir

one approach which could allow such patterns is #8668 which would also require doing deployCode but without FOUNDRY_PROFILE stuff

and in combination with https://github.com/foundry-rs/compilers/issues/197 it could allow avoiding manual deployCode stuff

though both PRs are drafts which ended up quite complex so I've deprioritized them at some point

[zerosnacks]

Marking as duplicate, there are other tickets that already capture this goal, see: https://github.com/foundry-rs/foundry/issues/7720