Hi, the problem is that this is a warning generated by the linker to warn the user that he potential swapped the arguments which it does since 0 occurs more often on the value side and memset(*,0,0) actually does nothing.
Cheers, -Bernhard 2015-08-20 16:17 GMT+02:00 Scott Robison <scott at casaderobison.com>: > I suspect this is similar to another "recent" discussion about passing null > pointers to mem* library functions. C89 allowed zero or null. C99 seems to > forbid it. I'm going from memory here, can look at standards later if > desired > On Aug 20, 2015 8:08 AM, "Richard Hipp" <drh at sqlite.org> wrote: > > > On 8/20/15, Bernhard Schommer <bernhardschommer at gmail.com> wrote: > > > Hi, > > > > > > the warning which is mentioned in the ticket > > > f51d9501800de5a0fb69d5048ce6662981b461ec still occurs also with newer > gcc > > > versions. The ticket was closed after a gcc bug report was opened. The > > gcc > > > bug was closed due to a missing testcase. > > > I had a quick look at the problem and it seems that the warning is > right > > > since in certain context and with optimizations enabled gcc can prove > > > that EXPR_FULLSIZE > > > - nSize == 0 and thus the triggered warning for this is correct. > > > > I cannot find anything in the memset() documentation that says that > > the third parameter must be greater than zero. Am I missing > > something? Do there exist implementions of memset() for which that is > > so? > > > > On the other hand, if all conforming implementations of memset() must > > work correctly even if their third argument is zero, why is gcc > > warning me about this? > > > > > Replacing > > > memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize); > > > By > > > if(EXPR_FULLSIZE-nSize > 0) > > > memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize); > > > would remove the warning, > > > > > > Cheers, > > > -Bernhard > > > _______________________________________________ > > > sqlite-users mailing list > > > sqlite-users at mailinglists.sqlite.org > > > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > > > > > > > -- > > D. Richard Hipp > > drh at sqlite.org > > _______________________________________________ > > sqlite-users mailing list > > sqlite-users at mailinglists.sqlite.org > > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > _______________________________________________ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users >
