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Re: Certain numbers of special forms cause changing behaviour on functio

From: Eli Zaretskii
Subject: Re: Certain numbers of special forms cause changing behaviour on function calls in --batch
Date: Sun, 10 Jul 2016 17:53:25 +0300

> From: Noam Postavsky <address@hidden>
> Date: Sun, 10 Jul 2016 07:33:47 -0400
> Cc: Eli Zaretskii <address@hidden>, Michael Heerdegen <address@hidden>, 
> address@hidden, 
>       Emacs developers <address@hidden>
> I have gcc 5.3.0 here, and I get 10 (correct) when I compile Emacs
> 24.5 configured with --enable-checking, but 20 (incorrect) without
> that flag.

I've just built 24.5 with GCC 5.3.0 and without --enable-checking, and
I still don't see the problem in the resulting binary.

> In both cases running temacs with valgrind gives some
> errors which look suspicious (the version without --enable-checking
> additionally gives a bunch of what I assume are false positives while
> starting up). Emacs 25 gives similar errors (I haven't tried Emacs 25
> without --enable-check).
> (I'm showing here just the results from the --enable-checking
> versions, without it's the same except for printing 20 instead of 10)
> valgrind emacs-24.5/src/temacs -Q --batch -l nasty-move-end-of-line-batch.el
> [...]
> ==6167== Conditional jump or move depends on uninitialised value(s)
> ==6167==    at 0x55E74E: CHECK_NUMBER_OR_FLOAT (lisp.h:2627)
> ==6167==    by 0x5EC762: Fzerop (data.c:2387)

I don't understand these errors.  Please show the macro-expanded
source of Fzerop with that compiler and configuration options.

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