Re: Build errors on AIX

[Harald Koenig <H.Koenig@science-computing.de>]

On Feb 24, Pedro Alves wrote:

> > >       "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.
>                                                     ^^^^^^
> 
> How does one read that?  line 352, column 46?  On my sources,

oops, cut'n'paste error from the log file -- sorry!

yes. that's a (W)arning in line 352, don't care;)

the real error msg was this one -- fix is in my last mail:

     "gdb-CVS-20100222/gdb/aix-thread.c", line 651.14: 1506-343 (S) Redeclaration of getthrds differs from previous declaration on line 904 of "/usr/include/procinfo.h".


> I can't really guess exactly what's going on here.  AIX/RS6000
> is probably the port that most needs love of all the supported
> ports.  E.g, I wouldn't be surprised if recent changes like PIE
> or multi-program support and the revamping around these broke
> this port, for it does things in non-standard ways.  These
> commands may offer some clues:
> 
>  "(gdb) maint info breakpoints"
>  "(gdb) set debug infrun 1"
>  "(gdb) set target infrun 1"

	(gdb) set target infrun 1
	Ambiguous set command "target infrun 1": target-async, target-charset, target-wide-charset.

so:
	(gdb) set debug infrun 1
	(gdb) r
	Starting program: a.out 
	infrun: proceed (addr=0xffffffff, signal=0, step=0)
	infrun: resume (step=0, signal=0), trap_expected=0
	hello
	infrun: wait_for_inferior (treat_exec_as_sigtrap=0)
	infrun: target_wait (-1, status) =
	infrun:   356558 [process 356558],
	infrun:   status->kind = exited, status = 9
	infrun: infwait_normal_state
	infrun: TARGET_WAITKIND_EXITED
	
	Program exited with code 011.
	infrun: stop_stepping
	(gdb) maint info breakpoints
	Num     Type           Disp Enb Address    What
	-1      thread events  keep y   0xd04b37e8 <__pthread_init> inf 1
	(gdb) b main
	Cannot access memory at address 0xf0322508
	(gdb) maint info breakpoints
	Num     Type           Disp Enb Address    What
	-1      thread events  keep y   0xd04b37e8 <__pthread_init> inf 1
	(gdb) b main
	Cannot access memory at address 0xf0322508
	(gdb) 



and for AIX 5.1:

	gdb a.out 
	GNU gdb (GDB) 7.1.50.20100222-cvs
	Reading symbols from a.out...(no debugging symbols found)...done.
	(gdb) b main
	Breakpoint 1 at 0x1000039c
	(gdb) maint info breakpoints
	Num     Type           Disp Enb Address    What
	1       breakpoint     keep y   0x1000039c <main+32> inf 1
	(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) r
	Starting program: a.out 
	hello
	
	Program exited normally.
	(gdb) maint info breakpoints
	Num     Type           Disp Enb Address    What
	1       breakpoint     keep n   0x1000039c <main+32> inf 1
	-1      thread events  keep y   0xd0347e44 <__pthread_init> inf 1
	(gdb) r
	Starting program: a.out 
	hello
	
	Program exited normally.
	(gdb) b main
	Note: breakpoint 1 (disabled) also set at pc 0x1000039c.
	Breakpoint 2 at 0x1000039c
	(gdb) maint info breakpoints
	Num     Type           Disp Enb Address    What
	1       breakpoint     keep n   0x1000039c <main+32> inf 1
	-1      thread events  keep y   0xd0347e44 <__pthread_init> inf 1
	2       breakpoint     keep y   0x1000039c <main+32> inf 1
	(gdb) r
	Starting program: a.out 
	
	Breakpoint 2, 0x1000039c in main ()
	(gdb) 


ah, I just notice that bp #1 got disabled (likely because of that "Error in re-setting breakpoint 1: Cannot access memory at address 0x0").

instead of a 2nd "b main" it also works to enable #1 with "en b 1" ...


> If you have an older gdb that works, I think we get to
> debug the new gdb to try to track this down.

yes, our  gdb-6.8 binary works just fine for me on AIX 5.1++ ...


Harald Koenig
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