[RFC/PATCH] buildsys: cache build flags in vars

[Mike Frysinger]

On Monday 16 January 2012 14:17:52 Khem Raj wrote:
> On Mon, Jan 16, 2012 at 10:00 AM, Khem Raj <raj.khem at gmail.com> wrote:
> > On Sat, Nov 26, 2011 at 9:22 PM, Mike Frysinger <vapier at gentoo.org> wrote:
> >> Running `make clean` atm takes like 20 seconds because every subdir
> >> re-evaluates all the toolchain flags.  Add some helpers to automate
> >> the process of setting up variables to cache the result of tests,
> >> as well as the checking of an already set flag.
> >> 
> >> Now `make clean` takes like 2 seconds on my system.
> 
> -Wl,sort-section,alignment also seems to be computed wrongly in CFLAGS

i just pushed a fix.  could you give it a try ?
-mike
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