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
