Ryan, thank you very much for this information.  I am amazed at how fast you
replied.  Thank you.

I will give this a whirl, probably in the morning.  I'll let you know.

Thanks again,
Kevin


-----Original Message-----
From: Ryan Mansfield [mailto:community-noreply@qnx.com] 
Sent: April 13, 2010 19:56
To: general-toolchain
Subject: Re: Specifying a stack size causes crash

Kevin Stallard wrote:
> I wonder if it is the invocation of ldrel that is causing problems.
> 
> I ran qcc with the -vv option.  ldrel is called when I specify a stack
size, but it doesn't seem to be called when I don't . 

Yep, ldrel is what adds the stack note. In 6.3.2 there was an empty 
placeholder section for the note in crtn.o but newer binutils will 
discard empty sections. I suspect the problem your having is that ldrel 
is failing to correctly add a stack size note with the placeholder 
missing. Making room for a PT_NOTE segment post link without moving 
things around gets kind of tricky. n 6.4.0 we added a default stack note 
in the crtn.o files and then the 6.4.0 ldrel will modify the stack note 
in place if one exists (all new binaries), or if not (older 6.3.2 
binaries), try to create one create a stack note.

If you have a 6.4.0 system, grab the crtn.o files from it (or let me 
know which ones you need) and use the attached 64x ldrel built for 6.3.2 
and see if that works.

If it doesn't work, can you post the failing binary?

Regards,

Ryan Mansfield




_______________________________________________

General
http://community.qnx.com/sf/go/post51620

Hey Ryan,

I'm using a windows host, the ldrel_ doesn't look like a windows binary, can you build one for 6.3.2 windows host?

Thanks
Kevin

Ryan,

What do I do with the crtn.o file?  Am I supposed to link it against the binary? 

Sorry to ask dumb questions....

Kevin


> Kevin Stallard wrote:

> > I wonder if it is the invocation of ldrel that is causing problems.
> > 
> > I ran qcc with the -vv option.  ldrel is called when I specify a stack size,
>  but it doesn't seem to be called when I don't . 
> 
> Yep, ldrel is what adds the stack note. In 6.3.2 there was an empty 
> placeholder section for the note in crtn.o but newer binutils will 
> discard empty sections. I suspect the problem your having is that ldrel 
> is failing to correctly add a stack size note with the placeholder 
> missing. Making room for a PT_NOTE segment post link without moving 
> things around gets kind of tricky. n 6.4.0 we added a default stack note 
> in the crtn.o files and then the 6.4.0 ldrel will modify the stack note 
> in place if one exists (all new binaries), or if not (older 6.3.2 
> binaries), try to create one create a stack note.
> 
> If you have a 6.4.0 system, grab the crtn.o files from it (or let me 
> know which ones you need) and use the attached 64x ldrel built for 6.3.2 
> and see if that works.
> 
> If it doesn't work, can you post the failing binary?
> 
> Regards,
> 
> Ryan Mansfield

Got it figured out, in my over exuberance, I must have overwritten the 6.3.2 ldrel with the 6.4.1.  I reinstalled 6.3.2,
 the 2.18 binutils and 4.2.4 gcc.  All seems to be well now.

Thank you
Kevin