[gambit-list] A couple of random questions

Jason E. Aten j.e.aten at gmail.com
Mon Aug 15 17:12:54 EDT 2011


Interesting. Does this extend beyond  llvm-gcc  to clang or non -O1 flags?
Does it happen with DragonEgg ( http://dragonegg.llvm.org/ ) ?

best,
Jason

On Mon, Aug 15, 2011 at 2:10 PM, Marc Feeley <feeley at iro.umontreal.ca>wrote:

>
> On 2011-07-31, at 7:50 AM, Marc Feeley wrote:
>
> >
> > On 2011-07-31, at 1:59 AM, mikel evins wrote:
> >
> >> A little more info about my failing attempts to build Gambit.
> >>
> >> I tried a few variations (devel and non-devel) on downloading and
> configuring and updating; all failed to make it through a make check without
> a crash.
> >>
> >> I can install the prebuilt Gambit 4.6.1 binaries, and in some quick,
> superficial testing, they appear to work correctly, but I can't build
> certain projects (including iOS projects), because I don't have the
> associated Gambit sources.
> >>
> >> I'm using Lion (version 10.7) on an early 2008 24-inch iMac, with the
> developer tools provided through the App Store (XCode version 4.1, build
> 4B110).
> >>
> >> Has anyone built Gambit using this build environment or something close
> to it? At this point, I'm sort of wondering whether I need to wipe the
> machine and do a clean reinstall of everything.
> >>
> >>
> >>
> >> In case anyone wants more details, there's a lot more below:
> >>
> >
> > I have encountered this problem also (with Lion and the new Xcode).  The
> problem is due to LLVM gcc which is the default C compiler now and which
> does not compile the Gambit sources properly when the --enable-single-host
> configure option is given.  I've tried using gdb to find where the error is,
> but it is giving me an execution trace which doesn't correlate with the
> sources so I am confused in regards to the location of the error.
> >
> > So to fix the problem temporarily I did
> >
> >   CC="i686-apple-darwin11-gcc-4.2.1" ./configure --enable-single-host
> >   make
> >   make check
> >
> > I also committed a patch to look for "i686-apple-darwin11-gcc-4.2.1"
> before "gcc", but that is not a long term solution.
> >
> > My guess is that LLVM gcc is buggy, but I have not yet found a proof.
>
> Indeed it is LLVM gcc that is buggy.  It generates incorrect code for
> taking the address of a label (for use in computed gotos) when the -O1
> option is used.  The attached file exhibits the problem in a small C
> program.
>
> I have just submitted a bug report to the LLVM group.  I hate buggy
> compilers...
>
> Marc
>
>
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