OpenBLAS fixed in Xcode 11.2

[Jack Howarth]

On Fri, Nov 8, 2019 at 10:17 PM Ryan Schmidt <ryandesign at macports.org>
wrote:

> On Nov 8, 2019, at 20:03, Joshua Root wrote:
>
> > On 2019-11-9 10:28 , Jack Howarth wrote:
> >> I just noticed a really bizarre aspect to this Xcode 11 bug. If you
> >> build gmp manually from source with the default compiler flags in use...
> >>
> >> ./configure
> >> make
> >> make check
> >>
> >> the t-powm test case fails. However if you add -fstack-check
> >> explicitly on CFLAGS and CXXFLAGS, the t-powm test case failure is
> >> suppressed.
> >>
> >> ./configure  CFLAGS='-O2 -fcheck-stack' CXXFLAGS='-O2 -fcheck-stack'
> >> make
> >> make check
> >
> > Are the default compiler flags '-O2'?
>
> MacPorts default optimization flag is -Os.
>
>
Same behavior...

./configure  CFLAGS='-Os -fstack-check' CXXFLAGS='-Os -fstack-check'
make
make check

suppresses the failure

PASS: t-powm

with Xcode 11.2 in a manual build. Wonder how many of the remaining
packages that are requiring -fno-check-stack could actually be 'fixed' by
explicitly passing -fcheck-stack instead. Obviously that option disabled
some of the problematic stack checking code that Apple's clang is
automatically generating in the absence of the flag.
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