On Wed, Mar 28, 2012 at 05:19:54PM +0100, Steve McIntyre wrote: > Hey folks, > > I should have sent this out earlier, but vacation and other stuff > interrupted... :-( > > I had a chat a couple of weeks ago with Marcus Shawcroft, one of the > toolchain experts at ARM, and he's worried that programs/libraries > using libffi on armhf are going to have problems. libffi didn't really > support variadic functions until recently, and the armhf ABI is > *interesting* in this area. See [1] for an ffi mailing list post with > more information, dating back to last year. This is the first time > I've really been aware of this as an issue, and it could mean we need > to work on things quickly. There's a link in that mail to a Linaro > wiki page listing packages that use libffi5 [1]. Looking at the > current state in unstable, I see:
That certainly is an interesting problem. Makes me wonder how other architectures pass floating point to variadic functions. Never thought about it before. > tack:~$ apt-cache rdepends libffi5 | grep '^ ' | wc -l > 586 > tack:~$ apt-cache rdepends libffi5 | grep '^ ' | grep -e ghc -e haskell | wc > -l > 444 > > which means that there's a lot of haskell packages to worry about, and > up to ~140 other places to check. The changes for libffi (including an > extra API call to fix this) went in to unstable back in August 2011 in > 3.0.10~rc10-1, but packages *using* libffi would need updating to > actually use this new API where necessary. > > I think we need to check all those users, to find: > > (a) they're safe (i.e. they don't use variadics with floating point) > (b) they need updating to use the new libffi API > > I've put a list up in the Debian wiki at [3] to help track > this. Please dive in and look at how these packages are using FFI! I went through all the packages in the not obviously haskell list and moved all those that build-dep on ghc to the obviously haskell section. There was one package that builds with fp-compiler but uses some libghc packages. Since it didn't use ghc I didn't consider that to be obviously haskell related. Seems to be pascal using libghc somehow. Probably explains the need for libffi though. > [1] http://permalink.gmane.org/gmane.comp.lib.ffi.general/277 > [2] https://wiki.linaro.org/WorkingGroups/ToolChain/FFIusers > [3] http://wiki.debian.org/ArmHardFloatTodo#libffi I should pick a package to try and check and/or fix. -- Len Sorensen -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
