Index: utils/libcxx/test/target_info.py =================================================================== --- utils/libcxx/test/target_info.py +++ utils/libcxx/test/target_info.py @@ -15,6 +15,8 @@ import subprocess import sys +from libcxx.util import executeCommand + class DefaultTargetInfo(object): def __init__(self, full_config): self.full_config = full_config @@ -127,14 +129,14 @@ cmd = ['xcrun', '--sdk', name, '--show-sdk-path'] else: cmd = ['xcrun', '--show-sdk-path'] - try: - out = subprocess.check_output(cmd).strip() - res = 0 - except OSError: - res = -1 - if res == 0 and out: - sdk_path = out + out, err, exit_code = executeCommand(cmd) + print(out, err, exit_code) + if exit_code != 0: + self.full_config.lit_config.warning("Could not determine macOS SDK path! stderr was " + err) + if exit_code == 0 and out: + sdk_path = out.strip() self.full_config.lit_config.note('using SDKROOT: %r' % sdk_path) + assert isinstance(sdk_path, str) flags += ["-isysroot", sdk_path] def add_cxx_link_flags(self, flags):