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

[Richard Tran Mills]

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
>>>
>>


-- 
Richard Tran Mills, Ph.D.
Computational Earth Scientist      | Joint Assistant Professor
Hydrogeochemical Dynamics Team     | EECS and Earth & Planetary Sciences
Oak Ridge National Laboratory      | University of Tennessee, Knoxville
E-mail: rmills at ornl.gov  V: 865-241-3198 http://climate.ornl.gov/~rmills