[Rd] R uses private function in libc (PR#9107)
tlumley at u.washington.edu
Fri Jul 28 19:48:02 CEST 2006
> In any case, as you can see, __libc_stack_end goes away completely by libc
> 2.3.6, and as noted in the follow-up I sent to this bug yesterday, the
> reasons one shouldn't use this symbol are quite clearly stated here:
Only up to a point. We know that __libc_stack_end is not portable, but it
is being used to do something that is impossible to do portably: check
whether the C stack is about to overflow. Since there is no way to recover
from a C stack overflow, being able to prevent it is valuable.
Your fix disables this facility on all Linux systems, which may be
appropriate for your systems but is clearly undesirable as a change to R.
The real question is how to detect systems that do provide
__libc_stack_end and whether there is another non-portable way to do the
same thing on glibc versions that don't provide it.
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