mdb could use a larger input buffer
Several times when debugging the link-editor, I have been unable to :r it under mdb with the failing command line, because mdb's input buffer just isn't large enough. I appear to have a kilobyte, which is ample in every other situation, but link editor command lines frequently exceed that, and it's not always easy to minimize a test case if all the input objects, etc, are critical to what is being debugged.
(if there's some mdb trickery I'm missing to dodge this, mentioning it as a workaround would be fantastic, too...)
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