Re: [PATCH] Build configuration to skip ctime for modification test

[Junio C Hamano <gitster@pobox.com>]

Alex Riesen <raa.lkml@gmail.com> writes:

> Johannes Schindelin, Tue, Jul 22, 2008 22:17:21 +0200:
>> Hi,
>> 
>> On Tue, 22 Jul 2008, Alex Riesen wrote:
>> 
>> > +#ifndef NO_TRUSTABLE_FILEMODE
>> >  	if (ce->ce_ctime != (unsigned int) st->st_ctime)
>> >  		changed |= CTIME_CHANGED;
>> > +#endif
>> 
>> Surely you meant trust_executable_bit instead, right?
>
> No. Just what I said: we don't have filemode (like "at all") - so no
> ctime as well. But maybe you're right, and trust_executable_bit is
> more flexible. Or maybe both (the #ifdef _and_ trust_executable_bit)
> and must be used...
>
>> Otherwise, if you really want to tell at compile time,I think for clarity 
>> you have to introduce another #define, since NO_TRUSTABLE_FILEMODE 
>> definitely says something different than CTIME_IS_USELESS.
>
> I had that at first (NO_DEPENDABLE_CTIME, than IGNORE_CTIME), than
> deemed it excessive.

Why is it excessive?  My initial reaction was "what does trustable
filemode nor trust_executable_bit has anything to do with ctime".  Please
explain.