Bundle wgpu-native into Linux WebGPU amalgamation (#4220)

vendor/wgpu.cmake

@@ -67,15 +67,20 @@ list(APPEND _wgpu_lib_search_paths
     "${_mln_wgpu_source_dir}/build/release"
 )
 
+# Resolve the exact archive/import library filename emitted by wgpu-native.
+macro(mln_wgpu_find_exact_library out_var out_description)
+    foreach(_search_path ${_wgpu_lib_search_paths})
+        if(EXISTS "${_search_path}/${_wgpu_lib_name}")
+            set(${out_var} "${_search_path}/${_wgpu_lib_name}" CACHE FILEPATH "${out_description}")
+            break()
+        endif()
+    endforeach()
+endmacro()
+
 # On Android/iOS, use manual path search since find_library may not work with cross-compilation toolchains
 macro(mln_wgpu_find_library)
     if(ANDROID OR CMAKE_SYSTEM_NAME STREQUAL "iOS")
-        foreach(_search_path ${_wgpu_lib_search_paths})
-            if(EXISTS "${_search_path}/${_wgpu_lib_name}")
-                set(WGPU_LIBRARY "${_search_path}/${_wgpu_lib_name}" CACHE FILEPATH "wgpu-native library")
-                break()
-            endif()
-        endforeach()
+        mln_wgpu_find_exact_library(WGPU_LIBRARY "wgpu-native library")
     else()
         find_library(WGPU_LIBRARY
             NAMES wgpu_native libwgpu_native
@@ -87,6 +92,7 @@ macro(mln_wgpu_find_library)
 endmacro()
 
 mln_wgpu_find_library()
+mln_wgpu_find_exact_library(WGPU_STATIC_LIBRARY "wgpu-native static library")
 
 if(NOT WGPU_LIBRARY OR MLN_WGPU_NATIVE_VERSION)
     # Use a specific version of WGPU. This is required when to a rust application
@@ -153,6 +159,7 @@ if(NOT WGPU_LIBRARY OR MLN_WGPU_NATIVE_VERSION)
 
     # Try to find the library again
     mln_wgpu_find_library()
+    mln_wgpu_find_exact_library(WGPU_STATIC_LIBRARY "wgpu-native static library")
 
     if(NOT WGPU_LIBRARY)
         message(FATAL_ERROR "Failed to locate wgpu-native library after building")
@@ -163,6 +170,14 @@ else()
     message(STATUS "Found wgpu-native library: ${WGPU_LIBRARY}")
 endif()
 
+if(WGPU_STATIC_LIBRARY)
+    message(STATUS "Found wgpu-native static library: ${WGPU_STATIC_LIBRARY}")
+elseif(MLN_CREATE_AMALGAMATION)
+    message(FATAL_ERROR
+        "MLN_CREATE_AMALGAMATION=ON requires a static wgpu-native library, "
+        "but none was found in: ${_wgpu_lib_search_paths}")
+endif()
+
 # Create compatibility shims for Dawn header paths if they don't exist
 set(_webgpu-cpp-output_dir "${CMAKE_CURRENT_BINARY_DIR}/webgpu-cpp")
 set(_compat_shim_dir "${_webgpu-cpp-output_dir}/webgpu")