Re: [Chicken-users] Build Failure (maybe infinite recursion) on x86_64 Linux

[felix winkelmann]

On Mon, Mar 23, 2009 at 6:20 PM, Taylor Venable <address@hidden> wrote:
> On Mon, Mar 23, 2009 at 08:48:50AM +0900, Ivan Raikov wrote:
>>   I doubt this is the case, since the regex unit is almost identical
>> between Chicken 3 and Chicken 4. Taylor, can you compile Chicken with
>> the attached regex.scm and see if there is any routine from the regex
>> unit that is called at the point when the build process gets stuck?
>
> I can trigger the bug using Chicken 3.4.7 when compiled with the
> supplied regex.scm file (again I can do this by varying the -:s
> parameter until it gets stuck).
>
> A backtrace from GCC is attached (it continues to repeat through many
> frames after the output given).  It exhibits behaviour similar to that
> when using the regex.scm that comes with Chicken 3.4.7 normally.  The
> regex.c file which is generated is on my website at:
>
>    http://real.metasyntax.net:2357/tmp/regex-pcre.c.gz
>
> (Probably just my ignorance talking here again, but even though the
> header on the file says PCRE, there are a lot of references to irregex
> scattered throughout that file.)
>

It seems that one of the regexen's compiled in the definitions
for `absolute-pathname?' or `decompose-pathname' triggers
a loop in `nfa-join-transitions!' in the "files.scm" unit (these
are executed at toplevel, outside of the scope of the associated
lambdas).


cheers,
felix