[MacPorts] #34535: gcc45 @4.5.3_4 gfortran gives wrong results for log and exp functions on OSX lion

[MacPorts]

#34535: gcc45 @4.5.3_4 gfortran gives wrong results for log and exp functions on
OSX lion
-------------------------------+--------------------------------------------
 Reporter:  f.baart@…          |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.1.1                                
 Keywords:                     |        Port:                                       
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 The gfortran compiler generates programs that give incorrect results on
 OSX lion. I have tested the following program with gfortran-mp-4.5 and
 gfortran-mp-4.7.

 {{{
 program test_exp
   write(*,*) exp(1.0), log(2.7182818284590451)
 end program test_exp
 }}}

 This should result in the following output:
 2.71... 1.0...

 However on OSX Lion with gfortran it results in:
 2.7699862       1.3489696

 I have tested it with:
   gcc45 @4.5.3_4
 and
   gcc47 @4.7.0_3

 See also http://stackoverflow.com/questions/10673701/can-i-call-the-
 fortran-log-function-with-a-number for several related test cases.

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Ticket URL: <https://trac.macports.org/ticket/34535>
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