The Debian toolchain

Re: libffi - updates needed?

Hi David!

On Mon, Apr 16, 2012 at 06:28:55PM +0100, Dr. David Alan Gilbert wrote:
>* Steve McIntyre (steve <at> einval.com) wrote:
>> Hi,
>> 
>> I'm looking through the archive for packages using libffi. There's a
>> problem with libffi and variadic functions that has been recently
>> fixed - see
>> 
>>   http://lists.debian.org/debian-arm/2012/03/msg00108.html
>> 
>> for more information. So far, we only expect symptoms to show up on
>> armhf *but* it might be more widespread. Until recently, libffi didn't
>> support variadic functions properly. That's now been fixed in libffi,
>> but there's an extra API call necessary in places where variadics are
>> used.
>
>Ah, you've picked up this fun one 

Yup, Marcus pointed it out to me and I've started tracking it again. 

>As I remember most other archs 'get away with it' often
>because they do silly things like pass values in registers and 
>on the stack and still offset the stack for the ones passed in
>registers.   I don't know if anyone has got around to doing
>other backends other than armhf since I touched it, but
>I think we knew there were some of the MIPS varients that could
>do with it.

(Continue reading)

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Steve McIntyre | 16 Apr 18:52

libffi - updates needed?

Hi,

I'm looking through the archive for packages using libffi. There's a
problem with libffi and variadic functions that has been recently
fixed - see

  http://lists.debian.org/debian-arm/2012/03/msg00108.html

for more information. So far, we only expect symptoms to show up on
armhf *but* it might be more widespread. Until recently, libffi didn't
support variadic functions properly. That's now been fixed in libffi,
but there's an extra API call necessary in places where variadics are
used.

Looking at gcc-4.6 and gcc-4.7, I can see that the embedded copies of
libffi are too old for this fix. I don't see a build-dep on
libffi-dev, whish suggests that they're using these embedded copies
rather than the system version. A couple of questions here: I'm
curious why this is? If it's definitely necessary, could we update
those embedded copies to a more recent libffi with the change
included?

Even beyond that, there are quite likely to be changes that would need
to be made in the gcc source to use the new ffi_prep_cif_var()
function. My scan of the archive shows ffi_prep_cif() shows up / is
used in:

 gcc-4.6
 gcc-snapshot
 gcj-4.[467]

(Continue reading)

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Rich Pixley | 23 Dec 00:35

fat bfd?

Bfd is capable of being configured to handle a wide variety of object 
file formats for a wide variety of cpus, all concurrently.

Is there a prebuilt package which includes a fat bfd?  Perhaps to 
support a fat objdump?  Or is that something I'd have to build myself?

And if not, would it make any sense to partition the binutils such that 
the assembler had a single bolted format but that most of the other 
tools had a fat list of supported format?

--rich

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