Re: Optimizer options with autotools and CMake?

[Guy Harris <guy () alum mit edu>]

On Aug 3, 2014, at 11:01 AM, Evan Huus <eapache () gmail com> wrote:

> On Sun, Aug 3, 2014 at 1:40 PM, Guy Harris <guy () alum mit edu> wrote:
> > I've noticed, on occasion, that sometimes the CMake builds on the UN*X buildbots get warnings that the autotools 
> > builds don't.
> >
> > Recently, I tried to figure out what was different about the CMake builds; after some fixes that removed some 
> > incorrect differences between them, I eventually stumbled across the way to get CMake to produce makefiles that did 
> > verbose builds, printing the compile command as part of the build output, and found that the difference was very 
> > simple - autotools builds weren't building with a -O option, while CMake builds were building with -O2.
>
> I could have sworn my autotools builds used -O2... *goes to check*
>
> Yup, my master-1.12 vanilla autotools build adds -O2 to CFLAGS and CXXFLAGS. I don't have a master autotools build 
> handy, but I can't recall any changes that would have affected that...

Autotools changing to default to -O2 in a version later than the version installed on the 32-bit OS X buildbot (which I 
think is running Snow Leopard, so the autotools version might be the one that shipped with Snow Leopard - that was 
before Apple stopped shipping autotools)?
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