Support custom build commands for Swift static Linux/Wasm SDK builds (#149)

* Support custom build commands for Swift static Linux/Wasm SDK builds

* Update script URL to this PR branch for testing

* Revert "Update script URL to this PR branch for testing"

This reverts commit f956c65.

Author: jrflat

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

@@ -23,6 +23,7 @@ INSTALL_WASM=false
 BUILD_EMBEDDED_WASM=false
 SWIFT_VERSION_INPUT=""
 SWIFT_BUILD_FLAGS=""
+SWIFT_BUILD_COMMAND="swift build"
 
 while [[ $# -gt 0 ]]; do
     case $1 in
@@ -43,6 +44,10 @@ while [[ $# -gt 0 ]]; do
             SWIFT_BUILD_FLAGS="${1#*=}"
             shift
             ;;
+        --build-command=*)
+            SWIFT_BUILD_COMMAND="${1#*=}"
+            shift
+            ;;
         -*)
             fatal "Unknown option: $1"
             ;;
@@ -59,7 +64,7 @@ done
 
 # Validate arguments
 if [[ -z "$SWIFT_VERSION_INPUT" ]]; then
-    fatal "Usage: $0 [--static] [--wasm] [--flags=\"<build-flags>\"] <swift-version>"
+    fatal "Usage: $0 [--static] [--wasm] [--flags=\"<build-flags>\"] [--build-command=\"<build-command>\"] <swift-version>"
 fi
 
 if [[ "$INSTALL_STATIC_LINUX" == false && "$INSTALL_WASM" == false ]]; then
@@ -525,11 +530,15 @@ install_sdks() {
 }
 
 build() {
+    # Enable alias expansion to use a 'swift' alias for the executable path
+    shopt -s expand_aliases
+
     if [[ "$INSTALL_STATIC_LINUX" == true ]]; then
         log "Running Swift build with Static Linux Swift SDK"
 
         local sdk_name="${STATIC_LINUX_SDK_TAG}_static-linux-0.0.1"
-        local build_command="$SWIFT_EXECUTABLE_FOR_STATIC_LINUX_SDK build --swift-sdk $sdk_name"
+        alias swift='$SWIFT_EXECUTABLE_FOR_STATIC_LINUX_SDK'
+        local build_command="$SWIFT_BUILD_COMMAND --swift-sdk $sdk_name"
         if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
             build_command="$build_command $SWIFT_BUILD_FLAGS"
         fi
@@ -552,7 +561,8 @@ build() {
             local sdk_name="${WASM_SDK_TAG}_wasm"
         fi
 
-        local build_command="$SWIFT_EXECUTABLE_FOR_WASM_SDK build --swift-sdk $sdk_name"
+        alias swift='$SWIFT_EXECUTABLE_FOR_WASM_SDK'
+        local build_command="$SWIFT_BUILD_COMMAND --swift-sdk $sdk_name"
         if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
             build_command="$build_command $SWIFT_BUILD_FLAGS"
         fi

.github/workflows/swift_package_test.yml

@@ -79,6 +79,14 @@ on:
         type: string
         description: "Linux command to build and test the package"
         default: "swift test"
+      linux_static_sdk_build_command:
+        type: string
+        description: "Command to use when building the package with the Static Linux Swift SDK"
+        default: "swift build"
+      wasm_sdk_build_command:
+        type: string
+        description: "Command to use when building the package with the Swift SDK for Wasm"
+        default: "swift build"
       windows_pre_build_command:
         type: string
         description: "Windows Command Prompt command to execute before building the Swift package"
@@ -235,7 +243,7 @@ jobs:
           ${{ inputs.linux_static_sdk_pre_build_command }}
           which curl || (apt -q update && apt -yq install curl)
           curl -s --retry 3 https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/install-and-build-with-sdk.sh | \
-          bash -s -- --static --flags="$BUILD_FLAGS" ${{ matrix.swift_version }}
+          bash -s -- --static --flags="$BUILD_FLAGS" --build-command="${{ inputs.linux_static_sdk_build_command }}" ${{ matrix.swift_version }}
 
   wasm-sdk-build:
     name: Wasm SDK Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})
@@ -273,7 +281,7 @@ jobs:
           ${{ inputs.wasm_sdk_pre_build_command }}
           which curl || (apt -q update && apt -yq install curl)
           curl -s --retry 3 https://raw.githubusercontent.com/swiftlang/github-workflows/refs/heads/main/.github/workflows/scripts/install-and-build-with-sdk.sh | \
-          bash -s -- --wasm --flags="$BUILD_FLAGS" ${{ matrix.swift_version }}
+          bash -s -- --wasm --flags="$BUILD_FLAGS" --build-command="${{ inputs.wasm_sdk_build_command }}" ${{ matrix.swift_version }}
 
   windows-build:
     name: Windows (${{ matrix.swift_version }} - windows-2022)