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[Bug fortran/18597] New: numerical constant arithmetic overflow with integer(kind=4)
- From: "paul dot richard dot thomas at cea dot fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Nov 2004 15:58:08 -0000
- Subject: [Bug fortran/18597] New: numerical constant arithmetic overflow with integer(kind=4)
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
This error was encountered in building the NetCDF fortran90 test programme
with gfortran.
Numerical constants appear to be integer*4 and the +ve and -ve limits are
fixed to the same magnitude.
PROGRAM test_min
INTEGER(KIND=4),PARAMETER :: ikind=0
integer(kind=4) :: itest = -HUGE(ikind)-1
print *,-itest
print *,itest-1
END PROGRAM test_min
produces
$ /gcc-4.0/bin/gfortran -O3 test_min.f90
In file test_min.f90:3
integer(kind=4) :: itest = -HUGE(ikind)-1PROGRAM test_min
INTEGER(KIND=4),PARAMETER :: ikind=0
integer(kind=4) :: itest = -HUGE(ikind) !!!-1 removed
print *,-itest
print *,itest-1
END PROGRAM test_min
1
Error: Arithmetic overflow at (1)
whilst
correctly produces
$ ./a
2147483647
-2147483648
--
Summary: numerical constant arithmetic overflow with
integer(kind=4)
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: paul dot richard dot thomas at cea dot fr
CC: gcc-bugs at gcc dot gnu dot org,paulthomas2 at wanadoo
dot fr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18597