[Buildroot] [PATCH] Config.in: add -Ofast option
Yann E. MORIN
yann.morin.1998 at free.fr
Mon Mar 26 16:12:40 UTC 2018
Thomas, All,
On 2018-03-25 22:40 +0200, Thomas Petazzoni spake thusly:
> On Sun, 25 Mar 2018 10:24:34 +0200, Yann E. MORIN wrote:
> > > +config BR2_OPTIMIZE_FAST
> > > + bool "optimize for fast"
> >
> > -Ofast was introduced in gcc-4.6, so you need a dependency:
> > depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
>
> The "odd" thing being that menuconfig is organized as follows:
>
> Target options --->
> Build options --->
> Toolchain --->
>
> The optimization level is selected in "Build options" and the compiler
> version is basically decided in "Toolchain".
>
> So if you select -Ofast in Build options, and then go in Toolchain
> chose a < 4.6 compiler, your -Ofast selection would disappear.
Yeah, I know. But, as you ssay:
> But there's no good way around this, and using gcc < 4.6 is anyway very
... there's no good solution around this issue, and the case for gcc
before 4.6 is rare enough that we don't care abot those poor souls
anymore... :-/
> rare these days, so I also agree that the "depends on" you suggest is
> what makes the most sense.
Was that an Acked-by or a Reviewed-by? ;-)
Regards,
Yann E. MORIN.
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