Function _maybe_write

torch/utils/cpp_extension.py:268–282

r''' Equivalent to writing the content into the file but will not touch the file if it already had the right content (to avoid triggering recompile).

(filename, new_content)

    return ['clang++', 'clang'] if IS_MACOS else ['g++', 'gcc', 'gnu-c++', 'gnu-cc', 'clang++', 'clang']

def _maybe_write(filename, new_content):
    r'''
    Equivalent to writing the content into the file but will not touch the file
    if it already had the right content (to avoid triggering recompile).
    '''
    if os.path.exists(filename):
        with open(filename) as f:
            content = f.read()

        if content == new_content:
            # The file already contains the right thing!
            return

    with open(filename, 'w') as source_file:
        source_file.write(new_content)

def get_default_build_root() -> str:
    """