As ikegami mentioned, the effect on $? is due to running a shell to perform the I/O redirection. If you can assume a Bourne shell, (probably a safe assumption on POSIX systems, which redirection to /dev/null already assumes) then you can use the exec shell command like so:
`exec my_executable_that_seg_faults > /dev/null`;
Note that this is the shell exec inside the qx//, not the Perl exec. The shell exec command causes the shell to replace itself with the desired executable and thus should cause $? to reflect the executable's exit status, instead of the shell's exit status.
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