emscripten: Enable aaarch64 builds

mingw-w64-emscripten/PKGBUILD

@@ -13,7 +13,7 @@ _llvm_project_revision=bda19768de03a0322c4094c8d0e00ad033268309
 pkgrel=1
 pkgdesc="Compile C and C++ into highly-optimizable JavaScript for the web (mingw-w64)"
 arch=('any')
-mingw_arch=('ucrt64' 'clang64')
+mingw_arch=('ucrt64' 'clang64' 'clangarm64')
 url="https://emscripten.org"
 msys2_repository_url="https://github.com/emscripten-core/emscripten"
 license=('custom')

mingw-w64-emscripten/emscripten-CLANGARM64.install

@@ -0,0 +1,22 @@
+post_install() {
+  echo "You need to login again or 'source /clangarm64/etc/profile.d/emscripten.sh'"
+  echo "in your already running shells to be able to use emscripten."
+  # Install config file
+  WIN_PATH=$(cygpath -m /clangarm64)
+  rm -rf ${WIN_PATH}/lib/emscripten/.emscripten
+  cat > ${WIN_PATH}/lib/emscripten/.emscripten <<EOF
+# .emscripten file for MSYS2 MinGW
+
+import os
+LLVM_ROOT='${WIN_PATH}/opt/emscripten-llvm/bin'
+NODE_JS='${WIN_PATH}/bin/node.exe'
+EOF
+}
+
+post_upgrade() {
+  echo "You may need to manually clear your emscripten cache as clang may not link"
+  echo "the new library versions with cached data properly. Use this command:"
+  echo "$ emcc --clear-cache"
+  echo "You may also need to delete ~/.emscripten if emscripten complains about old paths"
+  echo "or executables not found."
+}