[flang] SIGABORT with invalid argument to `EXECUTE_COMMAND_LINE"

[DanielCChen]

Consider the following code:

      CALL EXECUTE_COMMAND_LINE("invalid")

      END

Flang has:

sh: invalid:  not found.

fatal Fortran runtime error(/home/cdchen/temp/execute_command_line03f_1.f:7): Command not found with exit code: 127.
IOT/Abort trap(coredump)

While the runtime error message is correct, could it avoid coredump and have a more peaceful exit?

[llvmbot]

@llvm/issue-subscribers-flang-runtime

Author: Daniel Chen (DanielCChen)

Consider the following code: ``` CALL EXECUTE_COMMAND_LINE("invalid")

  END

Flang has:

sh: invalid: not found.

fatal Fortran runtime error(/home/cdchen/temp/execute_command_line03f_1.f:7): Command not found with exit code: 127.
IOT/Abort trap(coredump)

While the runtime error message is correct, could it avoid coredump and have a more peaceful exit?
</details>

[DanielCChen]

I can work around it by adding cmdstat=.