[M3devel] ppc_linux hanging

[Jay K]

Alas, good news, bad news, restoring volatile on every load/store seems to fix this.
I wasn't even optimizing.

Tony any ideas?

I386_LINUX is ok. AMD64_DARWIN is ok.
SOLgnu is ok, but that doesn't count. I left volatile on there, was worried for some reason about interaction with stack walker, I forget.

So far the debugger is being very uncooperative, can't set any breakpoints..it works for C.

Aha.. 

gcc -gstabs+ -fPIC -pie 2.c
(gdb) break main
Breakpoint 1 at 0x658: file 2.c, line 3.
(gdb) run
Starting program: /home/jay/a.out 
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0x658: Input/output error.


(gdb) q
The program is running.  Exit anyway? (y or n) y
jay at plin:~$ gcc -gstabs+ -fPIC 2.c
jay at plin:~$ gdb ./a.out
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "powerpc-linux-gnu"...
(gdb) break main
Breakpoint 1 at 0x10000448: file 2.c, line 3.
(gdb) run
Starting program: /home/jay/a.out 

Breakpoint 1, main () at 2.c:3
3    }


So lame..

  - Jay

----------------------------------------
> From: jay.krell at cornell.edu
> To: m3devel at elegosoft.com
> Subject: ppc_linux hanging
> Date: Fri, 2 Jul 2010 08:10:10 +0000
>
>
> Alas, PPC_LINUX is very prone to hang on head.
>  e.g. compiling m3front.
>  It doesn't hang with @M3nogc.
>  The stack at the time just shows junk, no symbols at all.
>   and info threads shows nothing, maybe I mistyped it.
>
>
> I'll try to figure it out.
> The biggest recent change I think is removing volatile so I'll start
> by trying with that put back.
>
>
> Also I use Darwin more lately, which has its own thread suspension code.
> Could be something broke the others.
>
>
> Later,
>  - Jay
>
>