Reported by Arjan van Dijk,
http://gcc.gnu.org/ml/fortran/2007-04/msg00367.html
gfortran rejects the following code with the error:
"By-value argument at (1) is not allowed in this context"
This is because the following check is matched: resolve.c,
resolve_actual_arglist():
/* Intrinsics are still PROC_UNKNOWN here. However,
since same file external procedures are not resolvable
in gfortran, it is a good deal easier to leave them to
intrinsic.c. */
if (ptype != PROC_UNKNOWN
&& ptype != PROC_DUMMY
&& ptype != PROC_EXTERNAL)
However, in this case: ptype == PROC_MODULE.
The following values are possible:
PROC_UNKNOWN, PROC_MODULE, PROC_INTERNAL, PROC_DUMMY,
PROC_INTRINSIC, PROC_ST_FUNCTION, PROC_EXTERNAL
I have to think about which cases make sense and which don't.
What speaks against allowing PROC_INTRINSIC, PROC_INTERNAL, PROC_ST_FUNCTION?
Is there one which needs always be rejected? If yes, a test case would be nice.
For PROC_INTERNAL I would argue it should be allowed:
SUBROUTINE Grid2BMP(NX)
INTEGER, INTENT(IN) :: NX
call bmp_write(%val(nx))
contains
subroutine bmp_write(nx)
integer, intent(in) :: nx
end subroutine bmp_write
END SUBROUTINE Grid2BMP
end
For statement functions, I agree it should be invalid (for %VAL, %REF, %DESCR):
SUBROUTINE Grid2BMP(NX)
INTEGER, INTENT(IN) :: NX
integer :: i,f
f(i)=i**2 ! statement function
i = f(%VAL(i))
END SUBROUTINE Grid2BMP
This agrees with ifort which also rejects it.
And for PROC_INTRINSIC: ifort rejects sin(%VAL(x)) as above (%VAL/%REF/%DESCR
invalid in this context), gfortran has the error:
"Argument list function at (1) is not allowed in this context".
(I prefer Intel's error message.)
At the moment, I don't see any intrinsic which would work with %VAL, but maybe
I miss something. Is there an example for PROC_INTRINSIC or PROC_UNKNOWN which
needs to be supported?
Example:
a) Longer example, see follow up email (URL above)
b) short example (works if one moves the interface into the procedure body):
module x
interface
subroutine bmp_write(nx)
integer, intent(in) :: nx
end subroutine bmp_write
end interface
contains
SUBROUTINE Grid2BMP(NX)
INTEGER, INTENT(IN) :: NX
call bmp_write(%val(nx))
END SUBROUTINE Grid2BMP
END module
end
--
Summary: %VAL rejected for PROC_MODULE and PROC_INTERNAL
procedures
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31668
