I have just realized that getrlimit(RLIMIT_STACK) is a pretty widely
available syscall --- it's specified by the Single Unix Spec and the
man pages claim it works on all the platforms I have handy to check.
I propose that we make use of this call where available to prevent
people from setting max_stack_depth larger than, say, the current
stack rlimit less half a megabyte.  This will prevent pilot error
such as here:

It'd be even nicer to not have a max_stack_depth GUC at all, but
it's probably untenable to assume that getrlimit is available on
every platform.


                        regards, tom lane

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