Add Ubuntu 20.04 on ARM64 build agent (#4150)

Tests on this new platform are disabled for now due to #4152.

Related to #1854.

* Add Ubuntu 20.04 on ARM64 build agent

* Don't attempt to install Wasmer on linux-aarch64

* Fix typo: `==` -> `!=`

* Fix `sccache` installation on aarch64

* Use `aarch64` suffix in `target` property

* Fix `aarch64` suffix use

* Apply suggestions from code review

Co-authored-by: Yuta Saito <[email protected]>

Author: MaxDesiatov

.github/workflows/build-toolchain.yml

@@ -41,6 +41,15 @@ jobs:
             build_hello_wasm: true
             clean_build_dir: false
 
+          - build_os: ubuntu-20.04
+            agent_query: [ubuntu20.04, ARM64]
+            target: ubuntu20.04_aarch64
+            run_stdlib_test: false
+            run_full_test: false
+            run_e2e_test: false
+            build_hello_wasm: true
+            clean_build_dir: true
+
           - build_os: macos-11
             agent_query: macos-11
             target: macos_x86_64
@@ -75,7 +84,7 @@ jobs:
           rm -rf /usr/share/swift/
 
       - name: Free disk space
-        if: ${{ matrix.build_os == 'ubuntu-20.04' || matrix.build_os == 'ubuntu-18.04' }}
+        if: ${{ (matrix.build_os == 'ubuntu-20.04' || matrix.build_os == 'ubuntu-18.04') && matrix.agent_query == null }}
         run: |
           df -h
           sudo apt-get purge libgcc-9-dev gcc-9 libstdc++-9-dev libgcc-10-dev gcc-10 libstdc++-10-dev clang-6.0 llvm-6.0
@@ -125,7 +134,7 @@ jobs:
         run: |
 
           case "${{ matrix.target }}" in
-            "ubuntu20.04_x86_64" | "ubuntu18.04_x86_64" | "macos_x86_64" | "macos_arm64")
+            "ubuntu20.04_x86_64" | "ubuntu18.04_x86_64" | "ubuntu20.04_aarch64" | "macos_x86_64" | "macos_arm64")
               ./swift/utils/webassembly/ci.sh
             ;;
             *)

utils/webassembly/linux/install-dependencies.sh

@@ -35,9 +35,11 @@ cd $SWIFT_PATH
 ./utils/update-checkout --clone --scheme wasm --skip-repository swift
 
 # Install wasmer
-
-if [ ! -e ~/.wasmer/bin/wasmer ]; then
-  curl https://get.wasmer.io -sSfL | sh
+# FIXME: Wasmer doesn't support linux-aarch64, consider using a different WASI-compatible runtime.
+if [ "$(uname -m)" != "aarch64" ]; then
+  if [ ! -e ~/.wasmer/bin/wasmer ]; then
+    curl https://get.wasmer.io -sSfL | sh
+  fi
 fi
 
 cd $SOURCE_PATH
@@ -56,7 +58,7 @@ cmake --version
 
 if [ -z $(which sccache) ]; then
   sudo mkdir /opt/sccache && cd /opt/sccache
-  wget -O - "https://github.com/mozilla/sccache/releases/download/0.2.13/sccache-0.2.13-x86_64-unknown-linux-musl.tar.gz" | \
+  wget -O - "https://github.com/mozilla/sccache/releases/download/0.2.14/sccache-0.2.14-$(uname -m)-unknown-linux-musl.tar.gz" | \
     sudo tar xz --strip-components 1
   sudo ln -sf /opt/sccache/sccache /usr/local/bin
 fi