gmane.linux.debian.devel.toolchain

Re: libffi - updates needed?

Matthias Klose — 2012-04-18T13:13:18

gcc-snapshot roughly has the 3.0.11 libffi release.  libffi inside gcc is only
used as a convenience library for libgcj, nothing else. the armhf specific issue
is fixed in the Debian/Ubuntu packages, and libgcj doesn't make use of the new
interfaces.

the python sources have an embedded libffi as well, which is not used by the
python package builds.

  Matthias

Re: libffi - updates needed?

Dr. David Alan Gilbert — 2012-04-17T08:40:22

<snip>


Looking through my notes I've got a mention that a test failed on MIPS n32
(although there was some thinking that it might be fixable by passing
stuff both on stack and in registers), I also have a vague
memory about someone asking on the ffi list about it on MIPS but can't
find it.
There is the 6 year old gcc bug ( http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26744 )
for PPC MacOS (!).


Correct, no response.


Ah, I hadn't been brave enough to open the Haskell stuff up.


There was a GCJ failure on armhf that was blamed on libffi for a while
until we spoke to aph and he found the real cause.

The other one to look at is there are a lot of examples of using libffi
for variadic that are wrong, even if no one uses it in anger; eg.

http://www.swig.org/Doc1.3/Varargs.html#Varargs_nn7

Have fun,

Dave

Re: libffi - updates needed?

Steve McIntyre — 2012-04-16T17:50:07

Hi David!

On Mon, Apr 16, 2012 at 06:28:55PM +0100, Dr. David Alan Gilbert wrote:

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


Right. Are these the newer mips ABI variants like n32/n64, do you
know? If so, I'm not so worried just yet!


Yes, I've seen that too.


Yes. I looked for a response to your original mail there and couldn't
find any in list archives; I'm guessing that's because you didn't get
one?

The Haskell packages that showed up in my scan of the Debian archive
are apparently all OK; ghc has a habit of embedding large chunks of
the core in everything it builds, and the ffi calls there are expected
to be safe (no variadics).

Otherwise, as you say: I'm looking at a number of language
implementations where it's (a) not clear if they'll ever do variadics
(b) if they *might* use variadics, it'll be because somebody is
calling through a generic helper function with no current way of
determining if the callee is variadic or not. Yay... :-/

libffi - updates needed?

Steve McIntyre — 2012-04-16T16:52:01

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]

at least. Can you help please?

Re: Bulding cross-toolchains in the archive

Jonathan Nieder — 2012-02-02T21:56:01


I can't control the rest of you ;-), but if I get time for this, I'll
pursue the approach using cross-arch dependencies.

If the main archive isn't ready in time, that just means the
cross-compilation toolchain I use will have to be in contrib or a
private archive.

Thanks,
Jonathan

Re: Bulding cross-toolchains in the archive

Hector Oron — 2012-02-02T17:25:55

Hello,

2012/1/31 Jonathan Nieder <jrnieder< at >gmail.com>:



I wonder which approach should we tackle for approaching wheezy
release, with multi-arch so close, it would be a pity to pollute
Debian archive name space with -$arch-cross packages. But still, build
daemons will not be aware of cross-arch dependencies until wheezy+1,
so we are unable to have a cross compiler packages in wheezy by
build-depending on cross-arch packages.

Another approach would be bootstrap cross compiler from scratch, which
is the approach followed by Marcin packages, but I would suggest to
change -$arch-cross dependencies to the multi-arch equivalents and
force user to enable multi-arch for such architecture on their system.
Of course, as a pre-requirement we need a dpkg aware of multi-arch in
unstable (hopefully sooner than later).

Any thoughts on what solution we want for the upcoming wheezy release?

Cheers,

Re: Bulding cross-toolchains in the archive

Jonathan Nieder — 2012-01-31T21:14:24


Yes, good idea.  Sounds like the cross-arch dependency stuff isn't too
serious an obstacle at all; thanks much for clarifying it.

Re: Bulding cross-toolchains in the archive

Jonathan Nieder — 2012-01-31T18:55:35


For binutils-<triplet>, see also [1] as another potential starting
point.

gcc-<triplet> is harder because the project does not currently permit
cross-architecture dependencies.  (There are multiple reasons for
this, some having to do with tools, other having to do with need for a
coherent policy that would deal, for example, with what happens when
an arch is dropped.)

Thanks for a nice summary,
Jonathan

[1] http://bugs.debian.org/623953#20

Re: pcc-for-x86-64-linux-gnu: depends on an unavailable package

Jonathan Nieder — 2011-12-05T07:51:44


I'm not sure what that has to do with what I said.  If the binutils
source package produces cross-compilers, that would make binutils
updates take longer on autobuilders and have more chance of failing
to build; hence, cross-compilers like mingw grab the same source code
through a Build-Depends from a different source package.  This is the
same trick that packages such as gcj-4.6 use.

The gcc-4.6 source package builds binary packages for C, Fortran,
Objective C, and C++ support.  It does not build packages for Java
support.

The gcj-4.6 source package is smaller and Build-Depends on the
"gcc-4.6-source" binary package, to allow source and rules to be
shared with gcc-4.6.


Thanks for the update.  Alas.

Jonathan

Re: pcc-for-x86-64-linux-gnu: depends on an unavailable package

Jonathan Nieder — 2011-12-05T03:00:28


I had thought that Matthias was (for good reasons) not interested in
the stock binutils source package producing cross-compilers for
additional targets on autobuilders, and that the binutils-source
package and Built-Using control header existed for this exact reason.
What did I miss?

Puzzled,
Jonathan

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fat bfd?

Rich Pixley — 2010-12-22T23:35:52

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