g77-gdb

[Joachim Hussong]

Hi,

I've problems with debugging g77-code with gdb. After reading the 
bug stuff of your home page I know that it's known that g77 and 
gdb are not working together properly . Toon Moene (I think he is 
known) said I should report my problems. 

I hope this is the right address to do this! 	I found no hint to a gdb 
bug report address.

SUMMARY:
Accessing  *arrays with gdb leads to a segmentation fault. This 
leads to crashes of graphical front ends like ddd. Hitting the array 
msg (see below) with the mouse (by accident) treats a look at the 
variable. gdb crashes and ddd stops working because of the lost of 
gdb.

ENVIRONMENT:
compiler: g77 version egcs-2.91.60 19981201 (egcs-1.1.1               
   release) (from FSF-g77 version 0.5.24-19980804) 
debugger: gdb 4.18

System information: Linux  2.2.7 #7 i686 unknown  

CONTACT INFO
Reported by: Joachim Hussong
             joachim.hussong@gmx.de
             joachim.hussong@dlr.de

DESCRIPTION:

Running gdb with the program attached below, gdb crashes by 
trying to access *MSG.

1) compiling: g77 -g -o test3.x test3.f
2) starting debugger: gdb test3.x
    debugging: break 1
      run
      step
      step
      print *msg
3) segmentation fault

Processing this on an AIX 4.1.4 with compiler xlf leads to the error 
message "attempt to take contents of a non-pointer value". gdb is 
still alive!

example code:
      PROGRAM TEST3
      CALL HELLO( 'Hello World!\0')
      END PROGRAM
      SUBROUTINE HELLO( MSG)
      BYTE MSG(*)
      INTEGER I
      I = 1
  10  PRINT *, MSG( I)
      I = I + 1
      IF( I.LT.20) GOTO 10
      END SUBROUTINE HELLO


Regards

Joachim

 --

-- 
joachim.hussong@dlr.de
joachim.hussong@gmx.de