Function _parse_clang_from_verbose

ci/wasm_build.py:975–1002

Parse the clang command from emcc verbose stderr output. emcc with EMCC_VERBOSE=1 prints subprocess commands to stderr. We look for the clang invocation that has -c (compile mode).

(stderr_text: str)

def _parse_clang_from_verbose(stderr_text: str) -> list[str] | None:
    """Parse the clang command from emcc verbose stderr output.

    emcc with EMCC_VERBOSE=1 prints subprocess commands to stderr.
    We look for the clang invocation that has -c (compile mode).
    """
    import shlex
    import sys

    # On Windows, use posix=False so backslash paths aren't treated as escape chars.
    # posix=False preserves literal quotes in tokens — strip them afterwards.
    posix = sys.platform != "win32"

    for line in stderr_text.splitlines():
        stripped = line.strip()
        if not stripped:
            continue
        parts = stripped.split()
        if parts and "clang" in parts[0].lower() and "-c" in parts:
            try:
                tokens = shlex.split(stripped, posix=posix)
                if not posix:
                    # posix=False keeps outer quotes on tokens — strip them
                    tokens = [t.strip("'\"") for t in tokens]
                return tokens
            except ValueError:
                continue
    return None


def _compile_cache_key(emcc_args: list[str]) -> str: