fix: fix Windows MSYS2 DLL paths for cmake install

- Use MSYSTEM_PREFIX from environment instead of hardcoding C:/msys64/mingw64
- Make DLL install steps OPTIONAL since UCRT64 with clang/libc++ doesn't
  have libgcc or libstdc++ DLLs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: andycall

bridge/CMakeLists.txt

@@ -22,9 +22,11 @@ if(CMAKE_SYSTEM_NAME MATCHES "MSYS" OR MINGW)
 
   # Install the DLL to the runtime binary directory
   # 'bin' is the standard destination for runtime executables and required DLLs
-  install(FILES "${LIBPTHREAD_DLL_PATH}" DESTINATION bin)
-  install(FILES "${LIBGCC_DLL_PATH}" DESTINATION bin)
-  install(FILES "${LIBSTDCXX_DLL_PATH}" DESTINATION bin)
+  # Use OPTIONAL since not all DLLs exist in every MSYS2 environment
+  # (e.g., UCRT64 with clang/libc++ doesn't have libgcc or libstdc++)
+  install(FILES "${LIBPTHREAD_DLL_PATH}" DESTINATION bin OPTIONAL)
+  install(FILES "${LIBGCC_DLL_PATH}" DESTINATION bin OPTIONAL)
+  install(FILES "${LIBSTDCXX_DLL_PATH}" DESTINATION bin OPTIONAL)
 endif()
 
 

scripts/tasks.js

@@ -719,7 +719,7 @@ task('build-window-webf-lib', (done) => {
         ...process.env,
         WEBF_JS_ENGINE: targetJSEngine,
         LIBRARY_OUTPUT_DIR: soBinaryDirectory,
-        MSYSTEM_PREFIX: 'C:/msys64/mingw64'
+        MSYSTEM_PREFIX: process.env.MSYSTEM_PREFIX || 'C:/msys64/mingw64'
       }
     });