wasm_release / wasm_debug_unopt broken in staging

https://ci.chromium.org/ui/p/flutter/builders/staging/Linux%20local_engine_builds?limit=100

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8693463348822775377/+/u/gn_--web_--runtime-mode_release_--no-rbe_--no-goma/stdout

Generating GN files in: out/wasm_release
ERROR at //build/config/darwin/darwin_sdk.gni:109:7: Script returned non-zero exit code.
      exec_script(rebase_path("//build/mac/darwin_sdk.py"), _args, "scope")
      ^----------
Current dir: /Volumes/Work/s/w/ir/cache/builder/engine/src/out/wasm_release/
Command: vpython3 /Volumes/Work/s/w/ir/cache/builder/engine/src/build/mac/darwin_sdk.py --print-paths
Returned 1.
stderr:

xcode-select: error: Unable to get active developer directory. Use `sudo xcode-select --switch path/to/Xcode.app` to set one (or see `man xcode-select`)
Traceback (most recent call last):
  File "/Volumes/Work/s/w/ir/cache/builder/engine/src/build/mac/darwin_sdk.py", line 171, in <module>
    sys.exit(main(sys.argv))
  File "/Volumes/Work/s/w/ir/cache/builder/engine/src/build/mac/darwin_sdk.py", line 150, in main
    sdk_info = get_sdk_info(sdks)
  File "/Volumes/Work/s/w/ir/cache/builder/engine/src/build/mac/darwin_sdk.py", line 88, in get_sdk_info
    sdk_info = SdkInfo(get_toolchain_path(), [])
  File "/Volumes/Work/s/w/ir/cache/builder/engine/src/build/mac/darwin_sdk.py", line 57, in get_toolchain_path
    xcode_path = subprocess.check_output(['xcode-select', '-print-path'], timeout=300).decode('utf-8').strip()
  File "/Users/chrome-bot/Library/Caches/vpython-root.502/store/cpython+fa1ipv0hcetnii1ulq4856mmfk/contents/lib/python3.8/subprocess.py", line 415, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/Users/chrome-bot/Library/Caches/vpython-root.502/store/cpython+fa1ipv0hcetnii1ulq4856mmfk/contents/lib/python3.8/subprocess.py", line 516, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['xcode-select', '-print-path']' returned non-zero exit status 2.

See //build/toolchain/mac/BUILD.gn:7:1: whence it was imported.
import("//build/config/darwin/darwin_sdk.gni")
^--------------------------------------------
See //build/compiled_action.gni:179:14: which caused the file to be included.
    deps = [ host_tool ]
             ^--------

The right thing to do is figure out why the Mac wasm builds are pulling in the host build logic, see #162164
But the easiest thing to do is to re-add xcode as a dependency to the macOS wasm builders. You can see non-iOS/host builds doing this, for example Android:

flutter/engine/src/flutter/ci/builders/local_engine.json

Lines 233 to 235 in 230240c

    
           "$flutter/osx_sdk": { 
        
             "sdk_version": "16c5032a" 
        
           }

Looked at this now.

The macos/wasm_release and macos/wasm_debug_unopt builders depend on the //build/toolchain/mac host toolchain because they build Wimp/Impeller.

Impeller includes some host binaries (the impellerc shader compiler and the flatc FlatBuffer compiler). These builds invoke //build/toolchain/mac scripts that require Xcode.

Running flutter/third_party/gn/gn desc --all --tree out/wasm_release //flutter/wasm will show the dependency tree of targets and their toolchains.

The tree only uses the Wasm toolchain if I remove //flutter/third_party/canvaskit:wimp_group from the contents of flutter_web_sdk_archive in https://github.com/flutter/flutter/blob/master/engine/src/flutter/web_sdk/BUILD.gn

If this builder needs to do a full Wasm engine build including Wimp, then the CI environment should install Xcode.

Re-added the xcode dependency to support the wimp build: #192238

Running with led confirms that the PR fixes the build:

Before the PR (failed):
https://ci.chromium.org/ui/p/flutter/builders/staging.shadow/Linux%20local_engine_builds/2/overview
https://ci.chromium.org/ui/p/flutter/builders/staging.shadow/Mac%20Staging%20Engine%20Drone/715/overview

led get-builder 'luci.flutter.staging:Linux local_engine_builds' \
  | led edit -pa git_ref='refs/heads/master' \
  | led edit -pa git_url='https://github.com/flutter/flutter' \
  | led launch

After the PR (succeeded):
https://ci.chromium.org/ui/p/flutter/builders/staging.shadow/Linux%20local_engine_builds/1/overview
https://ci.chromium.org/ui/p/flutter/builders/staging.shadow/Mac%20Staging%20Engine%20Drone/696/overview

led get-builder 'luci.flutter.staging:Linux local_engine_builds' \
  | led edit -pa git_ref='refs/pull/192238/head' \
  | led edit -pa git_url='https://github.com/flutter/flutter' \
  | led launch

Re-add Xcode and OpenJDK dependencies to macOS wasm local_engine buil…

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wasm_release / wasm_debug_unopt broken in staging #180648

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wasm_release / wasm_debug_unopt broken in staging #180648

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jmagman commented on Feb 19, 2026

jason-simmons commented on Jul 28, 2026

mdebbar commented on Sep 4, 2026

github-actions commented on Sep 23, 2026

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