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Re: [PATCH 4/5] Makefile: add USE_SHA1DC knob

Jeff King <peff@xxxxxxxx> writes:

> On Thu, Mar 16, 2017 at 03:43:13PM -0700, Junio C Hamano wrote:
>> Jeff King <peff@xxxxxxxx> writes:
>> > +ifdef USE_SHA1DC
>> > +	LIB_OBJS += sha1dc/sha1.o
>> > +	LIB_OBJS += sha1dc/ubc_check.o
>> The name of this CPP symbol is one difference between this and
>> Linus's version.  Wouldn't "-DSHA1_DC" make more sense?
> I'm fine with either. Somehow SHA1_DC felt too short, but it doesn't
> really matter in practice.

I'm fine with either, too.  It was just double SHA1 felt a bit
strange, when the naming convention was SHA1_ followed by the
characteristic attribute of the implementation (e.g. came from
Mozilla, etc.) and I thought "Detecting Collision" was the notable
characteristic of this one.

>> Another difference is that your version adds USE_SHA1DC to
>> GIT-BUILD-OPTIONS in patch 5/5; I thought GIT-CFLAGS forces
>> rebuilding and that was sufficient, but GIT-BUILD-OPTIONS is
>> available to tests for introspection, so adding it is needed
>> for that reason.
> Yep, exactly.