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Yes, it appears it is a MinGW problem or the library MinGW uses. Not sure which.
But either way, thanks everyone for saving some more hairs on my head.
I just use that computer in my shop to play...

Yes, bare bones test code.
That is the only code.
Using 3.4L did not change anything.
It's a 10 year old computer, the Code::Blocks is newly loaded on it,
but I'm not sure if the Compiler came...

I don't see what you are pointing out.
Shouldn't a long double be able to handle 3.4 or 1.0 for that matter?

Here's the code that works in Xcode C on OSX but not Windows XP using Code::Blocks version 10.05 May 27, 2010 build:
Extra info, C code using MinGW/GCC

Code:
long double a = 3.4;
printf("a is...