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#  SLEPc - Scalable Library for Eigenvalue Problem Computations
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#  Copyright (c) 2002-2010, Universidad Politecnica de Valencia, Spain
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#
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#  This file is part of SLEPc.
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#    
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#  SLEPc is free software: you can redistribute it and/or modify it under  the
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#  terms of version 3 of the GNU Lesser General Public License as published by
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#  the Free Software Foundation.
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#
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#  SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
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#  WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
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#  FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
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#  more details.
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#
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#  You  should have received a copy of the GNU Lesser General  Public  License
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#  along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import sys
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def Load(petscdir):
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  global ARCH,DIR,MAKE,SCALAR,PRECISION,ISINSTALL,INSTALL_DIR
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  if 'PETSC_ARCH' in os.environ:
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    ISINSTALL = 0
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    ARCH = os.environ['PETSC_ARCH']
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    PETSCVARIABLES = os.sep.join([petscdir,ARCH,'conf','petscvariables'])
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  else:
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    ISINSTALL = 1
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    ARCH = 'unknown'
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    PETSCVARIABLES = os.sep.join([petscdir,'conf','petscvariables'])
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  try:
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    f = open(PETSCVARIABLES)
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    for l in f.readlines():
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      (k,v) = l.split('=',1)
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      k = k.strip()
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      v = v.strip()
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      if k == 'PETSC_SCALAR':
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        SCALAR = v
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      elif k == 'PETSC_PRECISION':
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        PRECISION = v
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      elif k == 'MAKE':
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        MAKE = v
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      elif k == 'INSTALL_DIR':
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        INSTALL_DIR = v
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    f.close()
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  except:
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    sys.exit('ERROR: PETSc is not configured for architecture ' + ARCH)