Checking CPU capatibility...
                  Intel(R) Xeon(TM) CPU 2.80GHz
CPU features: SSE2 AVX AVX2
SW built on Jun  5 2016 with GCC 5.3.0
Build features: SSE2
Algo features: SSE2 AES
AES not available, starting mining with SSE2 optimizations...

I am a noob in compiling, I have never done it. I thought that you are interested 

Did you include CXXFLAGS="-std=gnu++11" in your configure?

CPUID status, will update with new info

Trying to fix a bug that isn't a bug just creates more bugs.

That's what happened with the AVX flag. The orignal implementation was correct. A detailed explanation
is avaiable in this file:

https://bitbucket.org/ariya/cpu-detect/src/cc2037e9bd0fb8cf12846dbfa4818fd813043972/base/cpu.h?at=master

So I've reverted.

The AVX2 flag isn't implemented by cpu-detect so I don't know if it requires the same logic ad AVX1. I will look into it further.

cpu_detect returns the AES flag directly from the cpuid register so it is still a complete mystery why it was misidentified
on the AMD Phenom2.

The owner of a Xeon without AES posted capabilities while attemting to use the CMB Westmere build and it showed some
interesting results. It correctly showed the CPU did not have AES but incorrectly displayed AVX and AVX2 as being
available.

This help define the problem, or should I say problems:

1. AVX shows available on non-AES CPU. This one might be understood and fixed with the correct reading of
this feature. I would need a volunteer with a non-AES CPU to test.

2. AES shows available on non-AES AMD CPU. Still a mystery but seems limited to AMD.

3. AVX2 shows available on non-AES CPUs. I have to reimplement this because it does not use cpuid.

I would like a volunteer or two because I don't like to publicly release code based on trial and error, which has
been happening for the past few releases. These volunteers would need to be able to compile their own, Windows
or Linux, doesn't matter. I hope I ave one volunteer already with an older AMD CPU. I would like a volunteer with
old Intel CPU particularly Westmere and Nehalem.

Investigation continues.

The result on AMD Phenom II X4 940

What file or self compile? Can you post ouput displayed at startup?

Edit: just tried it on my i7 6700K and no problems.

cpuminer-opt v3.3.5 is available.

Fixed hodl on Windows with non-AES CPUs. New build procedure for Windows, see README.md.
This fix is only significant for Windows users who compile their own on non-AES CPUs. Cryptomining
Blog does not build binaries for non-AES CPUs.

Rewrote CPU capabilities check to provide more info and be less verbose. It is implemented in permissive
mode meaning that mining will always be attempted. The miner may crash or perform at less than optimum.

This should close any remaining issues for now. It is recommended that all users upgrade even those who don't
like to update every release.

Download source:

https://drive.google.com/file/d/0B0lVSGQYLJIZVVp5aGxFVm1qVE0

Check CMB or OP for Windows binaries availability.