[petsc-dev] Disabling a header in configure based on a bad link?

[Satish Balay]

Its merged into master and maint now.

Satish

On Fri, 4 Oct 2013, Richard Tran Mills wrote:

> Hi Folks,
> 
> I ran into exactly the same problem yesterday--I'm going to be co-presenting a
> short course on PFLOTRAN at the Universitaet Goettingen next week and I've
> been trying to figure out proper instructions for participants using Windows
> to be able to build PFLOTRAN and PETSc.  Can someone merge Satish's patch into
> 'master' soon?
> 
> Thanks,
> Richard
> 
> On 9/25/13 12:34 PM, Satish Balay wrote:
> > Attached is the patch for this..
> > 
> > Satish
> > 
> > On Wed, 25 Sep 2013, Satish Balay wrote:
> > 
> > > perhaps the appropriate thing is to move the 'fenv.h' from the current
> > > location to this new test into config/BuildSystem/config/headers.py
> > > [i.e this code would add fenv.h header if the test is successful]
> > > 
> > > Satish
> > > 
> > > On Wed, 25 Sep 2013, Aron Ahmadia wrote:
> > > 
> > > > Hi folks,
> > > > 
> > > > I'm working on a Cygwin64 port of PETSc and I have a question about
> > > > doing a
> > > > specific disable in BuildSystem based on a failing link.
> > > > 
> > > > The Cygwin folks provide an fenv.h implementation that (as far as I can
> > > > tell), is currently broken due to an undefined FE_DFL_ENV variable.  My
> > > > inclination is to disable this functionality in PETSc by declaring that
> > > > fenv.h is unavailable if a simple link test fails.  I tried to write a
> > > > test
> > > > like this (in Configure.py)
> > > > 
> > > > def configureCygwin(self):
> > > >    '''Cygwin specific stuff'''
> > > >    # detect problem with missing FE_DFL_ENV symbol in Cygwin64
> > > >    if not self.checkLink('#include <fenv.h>', 'fesetenv(FE_DFL_ENV)'):
> > > >        self.headers.headers.remove('fenv.h')
> > > > 
> > > > 
> > > > I don't think it worked.  Has anybody had experience with *disabling*
> > > > functionality in BuildSystem?  Should we be less optimistic about having
> > > > the header and only enable it if the test passes?  Where would it go?
> > > > 
> > > > Cheers,
> > > > Aron
> > > > 
> > > 
> 
> 
>