Re: Compiling grub2 on *BSD?

[Robert Millan <rmh@aybabtu.com>]

On Tue, Jan 29, 2008 at 06:37:50PM -0600, jakllsch@kollasch.net wrote:
> > > > > /usr/lib/libgcc.a(_enable_execute_stack.o): In function
> > > > > `__enable_execute_stack':
> > > > > _enable_execute_stack.c:(.text+0x40): undefined reference to `__sysctl'
> > > > > _enable_execute_stack.c:(.text+0x6f): undefined reference to `mprotect'
> > > > > 
> > > > > Both of those symbols are defined in libc.a, so I included that, too.
> > > > > Any ideas?
> > > > 
> > > > Do you see this line in ./configure ?
> > > > 
> > > >   checking whether `gcc' accepts `-fstack-protector'... yes
> > > 
> > > Yes.
> > > 
> > > Apparently -fno-stack-protector doesn't actually work the way
> > > I/we would expect.
> > > 
> > > But, I'm surprised that this doesn't affect the building
> > > of NetBSD's own 'stand' code.
> > 
> > Maybe we need another flag?  Could you check the link command in NetBSD's
> > kernel ?
> 
> I couldn't find anything that looked like it would fix this.
> 
> I believe the reason that NetBSD's own code isn't affected by this is
> because they (apparently) do not use nested functions in
> their stand-alone code.

Ok, so we need __enable_execute_stack then, I guess.  I find it strange that
some parts of libgcc can not be used in freestanding code.  Does this happen
with the unpatched version of GCC too?

Maybe we'll have add some dummy symbols to make it happy.  I don't think
any of this will be actually needed when kernel isn't present.

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)