[cfe-dev] BUILD_SHARED_LIBS=True breaks some tests

Kim Gräsman via cfe-dev cfe-dev at lists.llvm.org
Sat Jan 12 02:09:48 PST 2019


On Wed, Jan 9, 2019 at 9:49 PM Chris Bieneman <chris.bieneman at me.com> wrote:
>
> > This doesn't make sense to me -- why would a shared build have
> > different runtime behavior from a static build? I was expecting a
> > symbol resolution failure of some kind, but this looks like the
> > compiler comes out broken somehow.
>
> I don't know about this specific case, but the difference in linker semantics for shared and static
> libraries is significant and can have an impact on runtime behavior. In my last email I just pointed
> out how llvm::cl::opt behaves differently between static and shared libs.

Sure, but the only problems I can think of off-hand are global
initialization order/duplication and possible fallout from ODR
violations. Both seem like latent bugs, especially the latter. But
maybe I'm missing something more subtle...

It's just curious that IWYU has a link failure on
PCHContainerOperations and Clang's test suite fails for stuff related
to it, both under BUILD_SHARED_LIBS.

Thanks,
- Kim


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