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Subject: [Bug fortran/54923] New: Internal unit I/O error when using -malign-double
Date: Sat, 13 Oct 2012 23:35:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54923

             Bug #: 54923
           Summary: Internal unit I/O error when using -malign-double
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gnu.0kn@gishpuppy.com


Reading from of integer from character string fails with 
Fortran runtime error: Internal unit I/O error
when compiling with -malign-double.

Background: This occurred when using the usual getarg(1,arg) construct and
linking against FFTW3, which requires data alignment.

Minimal example:
___

      PROGRAM readtest
      IMPLICIT NONE

      CHARACTER*8 arg
      INTEGER inputarg

      arg=" 1 "
      READ(arg,*) inputarg
      PRINT *,"Argument supplied was: ", inputarg

      RETURN
      END
___

Compiling with gfortran without data alignment yields the expected result.
Compiling with -malign-double in the compiler options yields runtime error.

Thank you.