🚀 go-pugleaf

Hello.

I am attempting to use GDB and am having some difficulties.  I'm hoping that
you can either clear them up or inform me that I am just out of luck.

Here is the problem:

I am trying to debug a F77 program on a Sun SPARCstation 1.  It pretty much
works.  There are just certain times when I get an error (in GDB) that I do
not know how to get around.  GDB seems to have no problems until I attempt
to reference a variable that is used in a subroutine call to an outside
package (such as SunPHIGS).  Here is a bit to show you what I mean:

  59	c  Open workstation 1.
  60	
  61	      iconid = 0
  62	      call popwk(iwkid, iconid, igrscr)
  63	

Watch what happens if I break in this routine at line 62:

  (gdb) b 62
  Breakpoint 1 at 0x3225c: file stm36.f, line 62.
  (gdb) run 123
  Starting program: /usr2/export/home/benedetto/programs/stmmn/stmmn.exe 123
  
   This is STMMN - $Revision: 2.1 $
  
  
  Breakpoint 1, stm36 () at stm36.f:62
  (gdb) p igrscr
  $1 = Cannot access memory at address 0x33ee270.
  (gdb) p iconid
  $2 = Cannot access memory at address 0x33ee268.
  (gdb) p iwkid
  $3 = 1
  (gdb) whatis igrscr
  type = int
  (gdb) whatis iconid
  type = int
  (gdb) whatis iwkid
  type = int
  (gdb) i add igrscr
  Symbol "igrscr" is static storage at address 0x33ee270.
  (gdb) i add iconid
  Symbol "iconid" is static storage at address 0x33ee268.
  (gdb) i add iwkid
  Symbol "iwkid" is static storage at address 0xa2cd8.
  (gdb) 

FYI iwkid is in COMMON and igrscr and iconid are just local variables.
More often than not the variables that I use when calling a subroutine are
NOT in COMMON and so I see "Cannot access memory at address 0x........" alot.

My question (which should be fairly clear by now) is:
(1) Is there something that I can do to my F77 code or to GDB OR when I
    compile in order to get around this problem?  (That is, I want to be
    able to print out any and all variables in a routine.)
   -OR-
(2) Am I stuck with this because it is a "feature" of Suns?

I have this same problem with both gdb v4.4 and v4.5.  I have built GDB with
(1) Sun's cc, (2) gcc v1.40, and (3) gcc v2.2.2 and get the same results
each time.

Here is my environment:

Sun workstation, SPARCstation 1.

SunOS 4.1.1 (SunOS Release 4.1.1 (GENERIC) #1: Thu Oct 11 10:25:14 PDT 1990)

GDB versions 4.4 and 4.5.  I used "sun4os4" when I configured.

                           I used Sun's cc the first time.  Then I edited
                           the Makefiles and added "CC=gcc" somewhere at the
                           top and rebuilt.  I used gcc versions 1.40 and
                           2.2.2.

F77 version 1.4.  I usually use the "-g -C" switches but I get the same
                  results using just "-g".

The "outside" package that I am using in SunPHIGS version 1.3.
A colleague of mine is getting similar results using SunPHIGS version 2.0.

Any answer that you could give me would be appreciated.  I check my email
usually only in the mornings and evenings because I have to dial up the
local university to get it.  So if you have further questions I can answer
them after I dial in to get the mail...

Thanks for any light that you can shed upon this...

Bill Benedetto
wurgler@zippysun.math.uakron.edu