document suggestion of "lite" mode for faster compilation

[mds1]

I'm not sure what section of the book to put this in, so dropping it in this issue for now, but per foundry-rs/forge-std#225 (comment) we may want to add something like this to the book:

---

Many projects use the solc optimizer, either directly or with via-ir. A config file may look like this for regular compilation:

[profile.default]
solc-version = "0.8.17"
optimizer = true
optimizer-runs = 10_000_000

Or like this for via-ir:

[profile.default]
solc-version = "0.8.17"
via_ir = true

The optimizer can significantly slow down compilation speeds, so one trick is to have a lite profile that has the optimizer off and use this for development. The updated config file for regular compilation may look like this:

[profile.default]
solc-version = "0.8.17"
optimizer = true
optimizer-runs = 10_000_000

[profile.lite]
optimizer = false

Or like this for via-ir:

[profile.default]
solc-version = "0.8.17"
via_ir = true

[profile.lite.optimizer_details.yulDetails]
optimizerSteps = ''

(note that there are additional optimizer details you can configure, see here for more info)

Running forge build (or test or script) still uses the standard profile, so by default a forge script invocation will deploy your contracts with the production setting. Running FOUNDRY_PROFILE=lite forge build (and again, same for test/script) will use the lite profile to reduce compilation times

[ZeroEkkusu]

what section of the book to put this in

• forge build docs
• Configuration > Optimizer docs

Note: There are already some mentions.

[mds1]

Thanks, the forge build page seems like a good fit. PR coming soon