On Fri, 20 Sep 2013, Russ Allbery wrote: > Yaroslav Halchenko <deb...@onerussian.com> writes:
> > long story short -- reason was the combination of optimization (-O1 was > > enough) + -D_FORTIFY_SOURCE=2 to fall into the "undefined" darkness of C > > standard(s) in s*printf() functions (man 3 sprintf, search for undefined > > or NOTES). > So basically a variation of the old problem of calling memcpy when one > meant to use memmove. I'm actually surprised that type of call to sprintf > ever worked reliably with optimization, even without _FORTIFY_SOURCE. > But, like memcpy vs. memmove, it's the sort of thing that's horribly > difficult to debug. yeah... and imagine this little utility being a part of a big script and then you only usually see the end-result being "strange" ;) For anyone interested in validation of computing pipelines I would like to introduce you to a project of your fellow DD Michael Hanke: https://testkraut.readthedocs.org/en/latest/ which apparently we ourselves yet underutilizing in NeuroDebian... but I guess will will start using now sooner than later. The main gist of it is to provide unified yet very flexible framework for (but not limited to) regression testing. Results are 'fingerprinted' so they could be easily compared/analyzed to verify/compare the performance of tools and complete pipelines in a generic fashion. -- Yaroslav O. Halchenko, Ph.D. http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org Senior Research Associate, Psychological and Brain Sciences Dept. Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755 Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419 WWW: http://www.linkedin.com/in/yarik -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130920202143.ga27...@onerussian.com
