[LLVMdev] Problem with InsertPointGuard ABI?

[Paweł Bylica]

On Tue, Jul 21, 2015 at 5:55 PM Justin Bogner <mail at justinbogner.com> wrote:

> Paweł Bylica <chfast at gmail.com> writes:
> > I can confirm that the issue has been caused by NDEBUG flag.
> >
> > On Mon, Jul 13, 2015 at 6:29 PM Reid Kleckner <rnk at google.com> wrote:
> >
> >     The layout of AssertingVH has depended on NDEBUG since 2009, which
> >     predates any of our efforts to make LLVM's ABI resilient to
> mismatched
> >     NDEBUG definitions between LLVM and its users.
> >
> >     For now, make sure your definition of NDEBUG matches LLVM's. In the
> long
> >     run, we could conceivably do something
> >     with LLVM_ENABLE_ABI_BREAKING_CHECKS to allow this mismatch.
> >
> > In practice it is very hard to make NDEBUG flag match configs of your
> project
> > and LLVM project. You often need to build debug and release versions of
> your
> > project and LLVM is installed as a debian package or with homebrew.
> Moreover,
> > there is not reliable way of checking if LLVM has been built with or
> without
> > NDEBUG.
>
> FWIW, `llvm-config --assertion-mode` will tell you whether or not your
> LLVM was built with or without NDEBUG.
>

That's not true in all cases. In case CMAKE_BUILD_TYPE=Release,
LLVM_ENABLE_ASSERTIONS=Off and CMAKE_CXX_FLAGS_RELEASE="" llvm-config
reports asserts as off but NDEBUG flag is not set.


>
> > Can I do anything more about it? Contributions related to
> >  LLVM_ENABLE_ABI_BREAKING_CHECKS needed?
> >
> > - Paweł
> >
> > _______________________________________________
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> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>
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