Add ARM64/aarch64 support

Author: dennisameling

action.yml

@@ -11,7 +11,7 @@ inputs:
     default: 'minimal'
   architecture:
     required: false
-    description: 'The architecture of the SDK: x86_64 or i686'
+    description: 'The architecture of the SDK: x86_64, i686 or aarch64. Note that "aarch64" uses the x86_64 SDK, but adds "clangarm64" to the path.'
     default: 'x86_64'
   msys:
     required: false

dist/index.js

@@ -15,13 +15,15 @@ async function run(): Promise<void> {
     }
     const flavor = core.getInput('flavor')
     const architecture = core.getInput('architecture')
+    const architectureToDownload =
+      architecture === 'aarch64' ? 'x86_64' : architecture
     const verbose = core.getInput('verbose')
     const msysMode = core.getInput('msys') === 'true'
 
     const {artifactName, download, id} =
       flavor === 'minimal'
-        ? await get(flavor, architecture)
-        : await getViaGit(flavor, architecture)
+        ? await get(flavor, architectureToDownload)
+        : await getViaGit(flavor, architectureToDownload)
     const outputDirectory = core.getInput('path') || `C:/${artifactName}`
     let useCache: boolean
     switch (core.getInput('cache')) {
@@ -64,7 +66,22 @@ async function run(): Promise<void> {
       }
     }
 
-    const mingw = architecture === 'i686' ? 'MINGW32' : 'MINGW64'
+    let mingw = ''
+
+    switch (architecture) {
+      case 'i686':
+        mingw = 'MINGW32'
+        break
+      case 'x86_64':
+        mingw = 'MINGW64'
+        break
+      case 'aarch64':
+        mingw = 'CLANGARM64'
+        break
+      default:
+        core.setFailed(`Invalid architecture ${architecture} specified`)
+    }
+
     const msystem = msysMode ? 'MSYS' : mingw
 
     const binPaths = [