Update WebGPU build script

Author: wcandillon

packages/webgpu/scripts/build/apple.toolchain.cmake

@@ -585,8 +585,9 @@ elseif(PLATFORM_INT STREQUAL "MAC_UNIVERSAL")
   if(NOT ARCHS)
     set(ARCHS "x86_64;arm64")
   endif()
-  string(REPLACE ";" "-" ARCHS_SPLIT "${ARCHS}")
-  set(APPLE_TARGET_TRIPLE_INT ${ARCHS_SPLIT}-apple-macosx${DEPLOYMENT_TARGET})
+  # For universal builds, don't set target triple - let CMake handle it
+  # string(REPLACE ";" "-" ARCHS_SPLIT "${ARCHS}")
+  # set(APPLE_TARGET_TRIPLE_INT ${ARCHS_SPLIT}-apple-macosx${DEPLOYMENT_TARGET})
 elseif(PLATFORM_INT STREQUAL "MAC_CATALYST_UNIVERSAL")
   set(SDK_NAME macosx)
   if(NOT ARCHS)

packages/webgpu/scripts/build/dawn.ts

@@ -96,7 +96,9 @@ const apple = {
 (async () => {
   process.chdir("../..");
   process.chdir("externals/dawn");
-  $("git reset --hard HEAD");
+  $(
+    "git reset --hard HEAD && git submodule foreach --recursive git reset --hard HEAD && git submodule update --init --recursive",
+  );
   $(`git apply ${__dirname}/static_build.patch`);
   process.chdir("../..");
   console.log("Copy headers");

packages/webgpu/scripts/build/static_build.patch

@@ -1,5 +1,5 @@
 diff --git a/src/cmake/BundleLibraries.cmake b/src/cmake/BundleLibraries.cmake
-index 046a6af10d..5a63ac3d6d 100644
+index 046a6af10d..ee272710fd 100644
 --- a/src/cmake/BundleLibraries.cmake
 +++ b/src/cmake/BundleLibraries.cmake
 @@ -66,8 +66,11 @@ function(bundle_libraries output_target)
@@ -16,3 +16,28 @@ index 046a6af10d..5a63ac3d6d 100644
    add_dependencies(${output_target} ${ARGN})
 
  endfunction()
+Submodule third_party/abseil-cpp contains modified content
+diff --git a/third_party/abseil-cpp/absl/copts/AbseilConfigureCopts.cmake b/third_party/abseil-cpp/absl/copts/AbseilConfigureCopts.cmake
+index 3f737c8..9b8bb4b 100644
+--- a/third_party/abseil-cpp/absl/copts/AbseilConfigureCopts.cmake
++++ b/third_party/abseil-cpp/absl/copts/AbseilConfigureCopts.cmake
+@@ -11,6 +11,11 @@ else()
+ endif()
+ 
+ if(APPLE AND CMAKE_CXX_COMPILER_ID MATCHES [[Clang]])
++  # Fix for iOS/visionOS ARM64 builds - skip x86_64 flags when building for ARM64 only
++  if((CMAKE_SYSTEM_NAME STREQUAL "iOS" OR CMAKE_SYSTEM_NAME STREQUAL "visionOS") AND CMAKE_OSX_ARCHITECTURES MATCHES "arm64" AND NOT CMAKE_OSX_ARCHITECTURES MATCHES "x86_64")
++    set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM64_FLAGS}")
++    list(APPEND ABSL_RANDOM_RANDEN_COPTS "-Wno-unused-command-line-argument")
++  else()
+   # Some CMake targets (not known at the moment of processing) could be set to
+   # compile for multiple architectures as specified by the OSX_ARCHITECTURES
+   # property, which is target-specific.  We should neither inspect nor rely on
+@@ -52,6 +57,7 @@ if(APPLE AND CMAKE_CXX_COMPILER_ID MATCHES [[Clang]])
+   if(ABSL_RANDOM_RANDEN_COPTS AND NOT ABSL_RANDOM_RANDEN_COPTS_WARNING)
+     list(APPEND ABSL_RANDOM_RANDEN_COPTS "-Wno-unused-command-line-argument")
+   endif()
++  endif() # End iOS ARM64 fix
+ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64|AMD64")
+   if (MSVC)
+     set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")