De-matrix Android triples

Building for multiple ABIs at once is something the swift-build frontend does for macOS and should eventually do for other platforms. Don't "lift" the triple into a new matrix axis.

This also renames the android_sdk_triple and android_ndk_version properties to plurals, since they support multiple versions. This is breaking, but the Android workflow is only a couple of days old, so this should be fine.

Author: jakepetroules

.github/workflows/scripts/install-and-build-with-sdk.sh

@@ -25,6 +25,7 @@ BUILD_EMBEDDED_WASM=false
 SWIFT_VERSION_INPUT=""
 SWIFT_BUILD_FLAGS=""
 SWIFT_BUILD_COMMAND="swift build"
+ANDROID_SDK_TRIPLES=()
 
 while [[ $# -gt 0 ]]; do
     case $1 in
@@ -37,7 +38,7 @@ while [[ $# -gt 0 ]]; do
             shift
             ;;
         --android-sdk-triple=*)
-            ANDROID_SDK_TRIPLE="${1#*=}"
+            ANDROID_SDK_TRIPLES+=("${1#*=}")
             shift
             ;;
         --static)
@@ -660,23 +661,27 @@ build() {
         local sdk_name="${ANDROID_SDK_TAG}${ANDROID_SDK_PATH_SEP}android${ANDROID_SDK_PATH_SUFFIX}"
 
         alias swift='$SWIFT_EXECUTABLE_FOR_ANDROID_SDK'
-        local build_command="$SWIFT_BUILD_COMMAND --swift-sdk ${ANDROID_SDK_TRIPLE:-$sdk_name}"
-        if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
-            build_command="$build_command $SWIFT_BUILD_FLAGS"
-        fi
 
-        log "Running: $build_command"
+        # This can become a single invocation in the future when `swift build` supports multiple Android triples at once
+        for android_sdk_triple in "${android_sdk_triple[@]}" ; do
+            local build_command="$SWIFT_BUILD_COMMAND --swift-sdk ${sdk_name} --triple ${android_sdk_triple}"
+            if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
+                build_command="$build_command $SWIFT_BUILD_FLAGS"
+            fi
 
-        # clear the ANDROID_NDK_ROOT environment variable if it is set
-        # due to https://github.com/swiftlang/swift-driver/pull/1879
-        # otherwise build error: missing required module 'SwiftAndroid'
-        export ANDROID_NDK_ROOT=""
+            log "Running: $build_command"
 
-        if eval "$build_command"; then
-            log "✅ Swift build with Android Swift SDK completed successfully"
-        else
-            fatal "Swift build with Android Swift SDK failed"
-        fi
+            # clear the ANDROID_NDK_ROOT environment variable if it is set
+            # due to https://github.com/swiftlang/swift-driver/pull/1879
+            # otherwise build error: missing required module 'SwiftAndroid'
+            export ANDROID_NDK_ROOT=""
+
+            if eval "$build_command"; then
+                log "✅ Swift build with Android Swift SDK completed successfully"
+            else
+                fatal "Swift build with Android Swift SDK failed"
+            fi
+        done
     fi
 
     if [[ "$INSTALL_STATIC_LINUX" == true ]]; then

.github/workflows/swift_package_test.yml

@@ -139,13 +139,13 @@ on:
         type: string
         description: "Command to use when building the package with the Swift SDK for Android"
         default: "swift build"
-      android_sdk_triple:
+      android_sdk_triples:
         type: string
-        description: "The triple to use when building with the Swift SDK for Android"
-        default: "[\"x86_64-unknown-linux-android28\"]"
-      android_ndk_version:
+        description: "The triples to use when building with the Swift SDK for Android"
+        default: "[\"aarch64-unknown-linux-android28\", \"x86_64-unknown-linux-android28\"]"
+      android_ndk_versions:
         type: string
-        description: "The NDK version to use when building with the Swift SDK for Android"
+        description: "The NDK versions to use when building with the Swift SDK for Android"
         default: "[\"r27d\"]"
       windows_pre_build_command:
         type: string
@@ -511,8 +511,7 @@ jobs:
       fail-fast: false
       matrix:
         swift_version: ${{ fromJson(inputs.android_sdk_versions) }}
-        sdk_triple: ${{ fromJson(inputs.android_sdk_triple) }}
-        ndk_version: ${{ fromJson(inputs.android_ndk_version) }}
+        ndk_version: ${{ fromJson(inputs.android_ndk_versions) }}
         os_version: ${{ fromJson(inputs.linux_os_versions) }}
         exclude:
           - ${{ fromJson(inputs.android_exclude_swift_versions) }}
@@ -560,7 +559,7 @@ jobs:
             exit 1
           fi
           curl -s --retry 3 https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/install-and-build-with-sdk.sh | \
-          bash -s -- --android --flags="$BUILD_FLAGS" --build-command="${{ inputs.android_sdk_build_command }}" --android-sdk-triple="${{ matrix.sdk_triple }}" --android-ndk-version="${{ matrix.ndk_version }}" ${{ matrix.swift_version }}
+          bash -s -- --android --flags="$BUILD_FLAGS" --build-command="${{ inputs.android_sdk_build_command }}" --android-sdk-triple="${{ join(fromJson(inputs.android_sdk_triples), ' --android-sdk-triple=') }}" --android-ndk-version="${{ matrix.ndk_version }}" ${{ matrix.swift_version }}
 
   windows-build:
     name: Windows (${{ matrix.swift_version }} - windows-2022)