I've run into a cryptic error message when trying to include Eigen in my iphone projects. It seems that everything compiles and runs as advertised when I have the EIGEN_DONT_VECTORIZE flag set, but I get the following error message otherwise.

{standard input}:unknown:Undefined local symbol LC0
{standard input}:unknown:Undefined local symbol LC1
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

I created a new project on my system to replicate and isolate the issue, but now I'm stuck. I'm using Xcode 3 and have the -mfpu=neon -mfloat-abi=softfp flags set.

The ARM-NEON optimizations are the main reason I want to use Eigen, so I need to fix this before I can more forward.

Anybody have any ideas or advice for how to fix this? Thanks.

Apparently the compiler is confused by the static global variables in NEON/Complex.h, wrapping them in inline functions returning them solves the problem. Patch coming.