Summary: The result of subprocess.check_output() is bytes in python3 which we need to convert to str(). Simplify this by using the executeCommand() helper. Reviewers: ldionne, EricWF Reviewed By: ldionne Subscribers: christof, libcxx-commits Differential Revision: https://reviews.llvm.org/D54522 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@346878 91177308-0d34-0410-b5e6-96231b3b80d8