ci: build arm64 linux nightlies (gakonst#694)

* ci: build arm64 linux nightlies

* fix: disable solc autodetection on arm

* fix: add autodetect warning on arm devices

Forge will output a warning on ARM devices stating that
autodetection is disabled, unless autodetection is explicitly
disabled by the user to silence the warning.

* ci: install `gcc-aarch64-linux-gnu` for arm builds

.github/workflows/release.yml

@@ -72,11 +72,15 @@ jobs:
  # The OS is used for the runner
  # The platform is a generic platform name
  # The target is used by Cargo
- # The arch is either 386 or amd64
+ # The arch is either 386, arm64 or amd64
  - os: ubuntu-latest
  platform: linux
  target: x86_64-unknown-linux-gnu
  arch: amd64
+ - os: ubuntu-latest
+ platform: linux
+ target: aarch64-unknown-linux-gnu
+ arch: arm64
  - os: macos-latest
  platform: darwin
  target: x86_64-apple-darwin
@@ -112,6 +116,12 @@ jobs:
  echo "SDKROOT=$(xcrun -sdk macosx --show-sdk-path)" >> $GITHUB_ENV
  echo "MACOSX_DEPLOYMENT_TARGET=$(xcrun -sdk macosx --show-sdk-platform-version)" >> $GITHUB_ENV
 
+ - name: Linux ARM setup
+ if: ${{ matrix.job.target == 'aarch64-unknown-linux-gnu' }}
+ run: |
+ sudo apt-get update -y
+ sudo apt-get install -y gcc-aarch64-linux-gnu
+
  - name: Build binaries
  env:
  RUSTFLAGS: -C link-args=-s

cli/src/cmd/build.rs

@@ -197,10 +197,21 @@ impl Provider for BuildArgs {
  dict.insert("libs".to_string(), libs.into());
  }
 
+ #[cfg(not(target_arch = "aarch64"))]
  if self.no_auto_detect {
  dict.insert("auto_detect_solc".to_string(), false.into());
  }
 
+ #[cfg(target_arch = "aarch64")]
+ {
+ if !self.no_auto_detect {
+ println!("Solidity compiler autodetection is disabled on ARM.");
+ println!("You can track progress on ARM support in https://github.com/gakonst/foundry/issues/525");
+ println!("To silence this warning use --no-auto-detect");
+ }
+ dict.insert("auto_detect_solc".to_string(), false.into());
+ }
+
  if self.force {
  dict.insert("force".to_string(), self.force.into());
  }