GDB 4.16 and G77: to print ARRAY(X, Y), use `print ARRAY(Y, X)'?

[Andreas Zeller]

Hi!

Using GDB 4.16 and G77 from egcs-1.0.1 on a sparc-sun-sunos4.1.4, it
turns out that I must write `print ARRAY(Y, X)' to print ARRAY(X, Y).

This is illustrated by the following example:

I have a piece of FORTRAN code `fbug.f', compiled with g77.

	double precision b(0:2, 2:4)
	b(0,2) = 66.00
	end

Using GDB 4.16, I place a breakpoint after the assignment and stop there:

        (gdb) b fbug.f:3
	(gdb) run
	Breakpoint 1, MAIN__ () at fbug.f:3
	3             end
	Current language:  auto; currently fortran
	(gdb) 

Printing `b' just works fine, and we see that b(0, 2) - reported first -
has indeed been initialized:

	(gdb) print b
	$1 = (( 66, 1.9851886796434546e-314, 0)
	(1.9851886164030519e-314, -3.1018262511099586e+231, 0) 
	( 0, 0, 4.4821635390717886e-320) )
	(gdb) 

However, printing b(0, 2) - which has just been assigned 66 - fails:

	(gdb) print b(0, 2)
	$2 = -3.1018262511099586e+231
	(gdb) 

Instead, to access b(0, 2), I must instruct GDB to print b(2, 0):

	(gdb) print b(2, 0)
	$3 = 66
	(gdb) 

I assume that either GDB's `print' command or `g77' get the ordering
of array indices wrong.

-- 
Andreas Zeller     Technische Universitaet Braunschweig, Germany
                   mailto:zeller@acm.org http://www.cs.tu-bs.de/~zeller/