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And add a check in the python script that the binary given to `--qemu` actually exists. Otherwise you get a generic Python error: ``` # .---command stderr------------ # | Traceback (most recent call last): # | File "/home/david.spickett/modules-llvm-project/libcxx/utils/qemu_baremetal.py", line 70, in <module> # | exit(main()) # | File "/home/david.spickett/modules-llvm-project/libcxx/utils/qemu_baremetal.py", line 66, in main # | os.execvp(qemu_commandline[0], qemu_commandline) # | File "/usr/lib/python3.8/os.py", line 568, in execvp # | _execvpe(file, args) # | File "/usr/lib/python3.8/os.py", line 610, in _execvpe # | raise last_exc # | File "/usr/lib/python3.8/os.py", line 601, in _execvpe # | exec_func(fullname, *argrest) # | FileNotFoundError: [Errno 2] No such file or directory # `----------------------------- # error: command failed with exit status: 1 ``` When it tries to run the entire command later. For the builder, it's only ever going to use qemu-system-arm so error at config time if it's not there.