[LLVMdev] Unable to build PBQP/Graph.h with libc++

Benjamin Kramer benny.kra at gmail.com
Sat Oct 20 14:08:02 PDT 2012

On 20.10.2012, at 22:47, Jordan Rose <jordan_rose at apple.com> wrote:

> Hi, everyone. Today I was trying to build LLVM with libc++ and C++11 enabled, and I ran into this:
> http://stackoverflow.com/questions/10065384/instantiation-of-a-list-with-an-incomplete-type-in-a-typedef
> Basically, PBQP/Graph.h forward-declares classes, then tries to get iterators for std::lists of those classes. This is technically undefined behavior. I tried fudging with the order of declarations for a while, but gave up after realizing there's not an easy way out.
> Is anyone else building LLVMCodeGen with libc++ and C++11? Is anyone else seeing this?

I was hitting this problem a while ago, but it's not reproducible when compiling llvm with clang trunk and libc++ trunk.

- Ben

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