third_party/gn/emsdk/can-use-closure.py

#!/usr/bin/env python3
#
# Copyright 2025 The Dawn & Tint Authors
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
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# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# Determines whether the Closure Compiler installed by emsdk works, on Mac.
# It requires either Rosetta 2 or Java to be installed, and will fail otherwise.
# Dawn's bots don't have either of those.

import os
import subprocess

# cd to Dawn root
os.chdir(os.path.join(os.path.dirname(__file__), '..', '..', '..'))

compiler_path = './third_party/emsdk/upstream/emscripten/node_modules/.bin/google-closure-compiler'
try:
    subprocess.check_call([compiler_path, '--version'],
                          stdout=subprocess.DEVNULL,
                          stderr=subprocess.DEVNULL)
    print('true')  # Output in GN "value" format
except subprocess.CalledProcessError:
    print('false')