Re: some compile errors fo gdb-7.0.1

[Harald Koenig]

Hi,

here is a problem report for break points on AIX 5.1 and 5.3.

first AIX 5.3:

if a program first runs in gdb without any break points and finished,
then it's not possible to set break a break point for the next run
(this is the same on AIX 5.1 too):


        # gdb a.out 
        GNU gdb (GDB) 7.1.50.20100222-cvs
        Reading symbols from a.out...done.
        (gdb) r 
        Starting program: a.out 
        hello
        
        Program exited normally.
        (gdb) b main
==>     Cannot access memory at address 0xf00d7530
        (gdb) q

with bogus address "0xf00d7530"


if there is a(ny) break point set for the 1st run things seem to work fine:

        # gdb a.out 
        GNU gdb (GDB) 7.1.50.20100222-cvs
        Reading symbols from a.out...done.
        (gdb) b main
        Breakpoint 1 at 0x100003c8: file hello.c, line 23.
        (gdb) r
        Starting program: a.out 
        
        Breakpoint 1, main (argc=1, argv=0x2ff22578, env=0x2ff22580) at 
hello.c:23
        23      main(int argc...
        (gdb) c
        Continuing.
        hello
        
        Program exited normally.
        (gdb) r
        Starting program: a.out 
        
        Breakpoint 1, main (argc...=1, argv=0x2ff22578, env=0x2ff22580) at 
hello.c:23
        23      main(int argc, ...
        (gdb) c
        Continuing.
        hello
        
        Program exited normally.
        (gdb) b main
        Note: breakpoint 1 also set at pc 0x100003c8.
        Breakpoint 2 at 0x100003c8: file hello.c, line 23.
        (gdb) r
        Starting program: a.out 
        
        Breakpoint 1, main (argc=1, argv=0x2ff22578, env=0x2ff22580) at 
hello.c:23
        23      main(int argc, ...
        (gdb) c
        Continuing.
        hello
        
        Program exited normally.
        (gdb) 



===============================================================================

on AIX 5.1 though setting a break point before the first run
only seems to work, but that break point is not functional for the 1st run:

        Reading symbols from a.out...done.
        (gdb) b main
        Breakpoint 1 at 0x100003c8: file hello.c, line 23.
        (gdb) i b
        Num     Type           Disp Enb Address    What
        1       breakpoint     keep y   0x100003c8 in main at hello.c:23
        (gdb) r
        Starting program: a.out 
==>     Error in re-setting breakpoint 1: Cannot access memory at address 0x0
==>     Error in re-setting breakpoint 1: Cannot access memory at address 0x0
        hello
        
        Program exited normally.
        (gdb) i b
        Num     Type           Disp Enb Address    What
        1       breakpoint     keep y   0x100003c8 in main at hello.c:23

and that break point doesn't function either in a 2nd run:

        (gdb) r
        Starting program: a.out 
        hello
        
        Program exited normally.


but if I add another bp to main (or another function) gdb starts to work 
"better";)

        (gdb) i b   
        Num     Type           Disp Enb Address    What
        1       breakpoint     keep n   0x100003c8 in main at hello.c:23
        (gdb) b main
        Note: breakpoint 1 (disabled) also set at pc 0x100003c8.
        Breakpoint 2 at 0x100003c8: file hello.c, line 23.
        (gdb) r
        Starting program: a.out 
        
        Breakpoint 2, main (argc=1, argv=0x2ff2248c, env=0x2ff22494) at 
hello.c:23
        23      main(int argc,...
        (gdb) i b
        Num     Type           Disp Enb Address    What
        1       breakpoint     keep n   0x100003c8 in main at hello.c:23
        2       breakpoint     keep y   0x100003c8 in main at hello.c:23
                breakpoint already hit 1 time
        (gdb) c
        Continuing.
        hello
        
        Program exited normally.
        (gdb) r
        Starting program: a.out 
        
        Breakpoint 2, main (argc=1, argv=0x2ff2248c, env=0x2ff22494) at 
hello.c:23
        23      main(int argc,...
        (gdb) c
        Continuing.
        hello
        
        Program exited normally.
        (gdb) 


any thoughts about that breakpoint weirdnes son AIX ?!?



right now I'm trying to build gdb on AIX 6.1 which right now fails here

      "gdb-CVS-20100222/gdb/aix-thread.c", line 352.46: 1506-280 (W) Function 
argument assignment between types "int*" and "unsigned int*" is not allowed.

where the source reads like this -- hmmmmm....

  /* getthrds(3) isn't prototyped in any AIX 4.3.3 #include file.  */
  extern int getthrds (pid_t, struct thrdsinfo64 *,
                       int, pthdb_tid_t *, int);



but now I have to leave for today -- stay tuned ;-))

Harald Koenig
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