[WIP] feat: make hermes build for visionOS

Author: okwasniewski

packages/react-native/sdks/hermes-engine/hermes-engine.podspec

@@ -12,7 +12,8 @@ react_native_path = File.join(__dir__, "..", "..")
 package = JSON.parse(File.read(File.join(react_native_path, "package.json")))
 version = package['version']
 
-source_type = hermes_source_type(version, react_native_path)
+# Temporaily build from source until visionOS supports prebuilt binaries
+source_type = HermesEngineSourceType::BUILD_FROM_GITHUB_MAIN # hermes_source_type(version, react_native_path)
 source = podspec_source(source_type, version, react_native_path)
 
 Pod::Spec.new do |spec|
@@ -35,7 +36,7 @@ Pod::Spec.new do |spec|
                   }
 
   spec.ios.vendored_frameworks = "destroot/Library/Frameworks/ios/hermes.framework"
-  spec.visionos.vendored_frameworks = "destroot/Library/Frameworks/visionos/hermes.framework"
+  spec.visionos.vendored_frameworks = "destroot/Library/Frameworks/xros/hermes.framework"
   spec.osx.vendored_frameworks = "destroot/Library/Frameworks/macosx/hermes.framework"
 
   if HermesEngineSourceType::isPrebuilt(source_type) then
@@ -133,7 +134,7 @@ Pod::Spec.new do |spec|
           :name => '[RN] [2] Build Hermes',
           :input_files => ["#{hermesc_path}/ImportHermesc.cmake"],
           :output_files => [
-            "${PODS_ROOT}/hermes-engine/build/iphonesimulator/API/hermes/hermes.framework/hermes"
+            "${PODS_ROOT}/hermes-engine/build/xrsimulator/API/hermes/hermes.framework/hermes",
           ],
           :script => <<-EOS
           . "${REACT_NATIVE_PATH}/scripts/xcode/with-environment.sh"

packages/react-native/sdks/hermes-engine/hermes-utils.rb

@@ -6,7 +6,7 @@
 require 'net/http'
 require 'rexml/document'
 
-HERMES_GITHUB_URL = "https://github.com/facebook/hermes.git"
+HERMES_GITHUB_URL = "https://github.com/okwasniewski/hermes.git"
 
 module HermesEngineSourceType
     LOCAL_PREBUILT_TARBALL = :local_prebuilt_tarball

packages/react-native/sdks/hermes-engine/utils/build-hermes-xcode.sh

@@ -24,7 +24,7 @@ else
   cmake_build_type="MinSizeRel"
 fi
 
-deployment_target=${IPHONEOS_DEPLOYMENT_TARGET}
+deployment_target=${XROS_DEPLOYMENT_TARGET}
 if [ -z "$deployment_target" ]; then
   deployment_target=${MACOSX_DEPLOYMENT_TARGET}
 fi
@@ -71,4 +71,4 @@ echo "Copy Apple framework to destroot/Library/Frameworks"
 
 cp -pfR \
   "${PODS_ROOT}/hermes-engine/build/${PLATFORM_NAME}/API/hermes/hermes.framework" \
-  "${PODS_ROOT}/hermes-engine/destroot/Library/Frameworks/ios"
+  "${PODS_ROOT}/hermes-engine/destroot/Library/Frameworks/xros"

packages/react-native/sdks/hermes-engine/utils/create-dummy-hermes-xcframework.sh

@@ -19,11 +19,13 @@ pushd destroot/Library/Frameworks > /dev/null || exit 1
 
 echo '' > dummy.c
 
-mkdir -p macosx/hermes.framework
-clang dummy.c -dynamiclib -o macosx/hermes.framework/hermes
+platforms=( "macosx" "ios" "xros" ) # Add other platforms here if needed
 
-mkdir -p ios/hermes.framework
-clang dummy.c -dynamiclib -o ios/hermes.framework/hermes
+for platform in "${platforms[@]}" 
+do 
+    mkdir -p "${platform}/hermes.framework"
+    clang dummy.c -dynamiclib -o "${platform}/hermes.framework/hermes"
+done
 
 rm dummy.c
 

packages/rn-tester/Podfile

@@ -40,7 +40,7 @@ def pods(target_name, options = {})
   # Hermes is now enabled by default.
   # The following line will only disable Hermes if the USE_HERMES envvar is SET to a value other than 1 (e.g. USE_HERMES=0).
   # TODO: Make hermes work
-  hermes_enabled = false # !ENV.has_key?('USE_HERMES') || ENV['USE_HERMES'] == '1'
+  hermes_enabled = !ENV.has_key?('USE_HERMES') || ENV['USE_HERMES'] == '1'
   puts "Configuring #{target_name} with Fabric #{fabric_enabled ? "enabled" : "disabled"}.#{hermes_enabled ? " Using Hermes engine." : ""}"
 
   use_react_native!(