[llvm-dev] TableGen crash when building LLVM with EXPENSIVE_CHECKS enabled

Alexander Richardson via llvm-dev
Mon, 03 Jun 2019 22:15:16 -0000

This looks like https://bugs.llvm.org/show_bug.cgi?id=37652 to me. I added
a workaround (
https://github.com/CTSRD-CHERI/llvm-project/commit/a7e68c6baf9967cfb288ca6c53c43b29581d27d8)
to our fork but never got around to submitting a review.

If adding a copy of the libc++ implementation as llvm::shuffle seems like a
valid approach I'll upload the patch to phabricator.

Alex


On Mon, 3 Jun 2019, 10:36 Nicolai Hähnle-Montoro via llvm-dev, <
llvm-dev at lists.llvm.org> wrote:

> I briefly dug into this and I can reproduce it, the issue appears to
> be the implementation of std::shuffle (which is called by llvm::sort
> with expensive checks).
>
> Sounds like you should file a bug against libstdc++.
>
> Cheers,
> Nicolai
>
>
> On Thu, May 30, 2019 at 10:39 AM Lau, Luke via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> >
> > Hello,
> > I'm trying to run checks with EXPENSIVE_CHECKS enabled, but it
crashes
> when
> > generating some intrinsics file with TableGen.
> >
> > > cd /home/luke/Source/llvm-project/build &&
/home/luke/Source/llvm-
> > > project/build/bin/llvm-tblgen -gen-intrinsic-impl -I
> /home/luke/Source/llvm-
> > > project/llvm/include/llvm/IR -I
> /home/luke/Source/llvm-project/llvm/include
> > > /home/luke/Source/llvm-project/llvm/include/llvm/IR/Intrinsics.td
-o
> > > include/llvm/IR/IntrinsicImpl.inc -d
> include/llvm/IR/IntrinsicImpl.inc.d
> > > /usr/bin/../lib/gcc/x86_64-linux-
> > > gnu/8/../../../../include/c++/8/debug/safe_container.h:83:
> > > Error: attempt to self move assign.
> > >
> > > Objects involved in the operation:
> > >     sequence "this" @ 0x0x7fe3b3070468 {
> > >     }
> > >
> >
> > The command I've been using to configure it is
> >
> > > cmake ../llvm -G Ninja \
> > >       -DCMAKE_BUILD_TYPE=Debug \
> > >       -DLLVM_ENABLE_LLD=On \
> > >       -DLLVM_ENABLE_EXPENSIVE_CHECKS=On
> > >
> >
> > Removing the -DLLVM_ENABLE_EXPENSIVE_CHECKS=On allows it to build. Is
> there
> > something wrong with the version on libstdc++ on my system? (Debian
> testing)
> > This was happening on revision
5857bf5d1e5a5ffe5ae51a38514ee55495c0cc69
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