Re: Optimizer options with autotools and CMake?

[Evan Huus <eapache () gmail com>]

On Sun, Aug 3, 2014 at 2:10 PM, Guy Harris <guy () alum mit edu> wrote:

> 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)?

Huh, like Jeff I didn't realize that was an autotools default - I thought
we were already setting it ourselves.

+1 to explicitly specifying optimization flags on all build systems.

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