[Gretl-users] Re: Repeatable crash using felogit package, if time dummies are included

Am 25.10.2020 um 16:04 schrieb Allin Cottrell: > On Sun, 25 Oct 2020, Allin Cottrell wrote: > >> So an interesting test on macOS would be to set GRETL_OLD_EV=1 and see >> if the problem persists. > > I just tried on macOS 10.15.6: I got the crash that Fred reported, but > when I set GRETL_OLD_EV=1 there was no crash. > > It turns out this is an Apple bug: there are two arguments to DSYEVR > that are not supposed to be referenced when the function is called in > the mode gretl uses (according to the netlib LAPACK docs). So we were > just passing NULL for those arguments. But apparently Apple's DSYEVR > does reference them, hence a crash on dereferencing a null pointer. In > git (snapshots to follow) we now pass pointers to dummy arguments in > those slots as a workaround. Do you have any link to the detailed API reference to Apple's Accelerate? I couldn't get any details for dsyev(r) by searching the web.

It doesn't matter much for gretl after your workaround solves the issue, but in principle I guess it's not clear it is really a bug, perhaps they just don't follow the netlib benchmark in this detail.