Bug#757492: gfortran-4.9: miscompiles int() on mips

[Julian Taylor <jtaylor.debian@googlemail.com>]

Package: gfortran-4.9
Version: 4:4.9.1-1
Severity: important

gfortran miscompiles int() for negative overflows leading to a build
timeout of python-scipy, see #756905
below a testcase, according to
https://gcc.gnu.org/onlinedocs/gfortran/INT.html the result should be
-2147483648

(sid_mips-dchroot)jtaylor@gabrielli:~$ apt-cache  policy gfortran
gfortran:
  Installed: 4:4.9.1-1
  Candidate: 4:4.9.1-1
  Version table:
 *** 4:4.9.1-1 0
        500 http://mirror-ubc.debian.org/debian/ sid/main mips Packages
        100 /var/lib/dpkg/status
(sid_mips-dchroot)jtaylor@gabrielli:~$ cat test.f90
      program add
      implicit none
      real a,b,s
      read *, a
      print *, ' is ' , int(a)
      stop
      end
(sid_mips-dchroot)jtaylor@gabrielli:~$ gfortran test.f90
(sid_mips-dchroot)jtaylor@gabrielli:~$ ./a.out
-1e99
  is   2147483647
Note: The following floating-point exceptions are signalling:
IEEE_INVALID_FLAG IEEE_OVERFLOW_FLAG