Only building a subset of runtimes does not work with runtime-benchmarks feature enabled

[hirschenberger]

Building the runtimes takes a long time. I tried to build just one runtime for benchmark development, but couldn't figure out how to build only the runtime I wanted to benchmark.

I tried cargo build --release --no-default-features --features="runtime-benchmarks","polkadot-cli/kusama-native" but this still builds all runtimes. Maybe they are opted in by the runtime-benchmarks feature?

Related matrix discussion

[hirschenberger]

It seems as if the building of all runtimes in runtime-benchmarks is added here:

polkadot/node/service/Cargo.toml

Lines 160 to 165 in c4ee9d4

	runtime-benchmarks = [
	"polkadot-runtime/runtime-benchmarks",
	"kusama-runtime/runtime-benchmarks",
	"westend-runtime/runtime-benchmarks",
	"rococo-runtime/runtime-benchmarks"
	]

This can in the future be solved with Cargo's weak dependency feature that is currently only available in nightly.

[gilescope]

Weak dependency features has been stabilized in the 1.60 release.