Success!!!!

I have successfully compiled Thunderbird with PGO.

I had to disable pgo for the Color Management module.
I included NO_PROFILE_GUIDED_OPTIMIZE = 1 right before the line that indicated what optimization this module is to have.

The Problem
I was receiving an internal linker error when the compiler was trying to optimize the mozlcms.dll. The error that was displayed was f:\mozilla\thunderbird\mozilla\modules\lcms\src\cmscgats.c (...) LINK : fatal error LNK1000: Internal error during IMAGE::BuildImage. I blogged about this error.

Steps to Resolve
At first I was compiling with VS 2008 which broke my original Firefox build. I figured that was the problem. I decided to create a VM of Windows 2003 and setup an environment as close as I could to the tinderboxes.

I installed Visual Studio 2005, VS 2005 SP1, and the Vista SDK. I tried to compile again and I received the same error. At this point I figured it was the Vista SDK since the environment I used with VS 2008 also had Vista SDK. So.....I have an environment that has Visual Studio 2005 without the Vista SDK.

I still got the error.

At this point I decided that I would disable that one module and hoped it all goes well.... and it DID!!!

In between I tried a bunch of other things that had no affect so I won't mention them but I have been compiling and compiling and installing and installing since Monday.

Details
A bug has been re-opened and I have posted to it.

I noticed that Thunderbird creates 27 DLL's in the dist/bin directory and Firefox creates 17 DLL's in the same directory.

The xul.dll file is 10x larger for Firefox than Thunderbird.

I'll post more details about what objects were optimized and what percentages they were optimized. I accidentally blew away my last build.