Out of RAM error, strange?

[Miniman]

Hi
I am writing a program using usb_cdc and my home made FAT32 code, but I'm running out of ram.. I can compile the program at one stage and it tells me that I use 85% of the ram, but if I declare and use a single byte more I get the "Not enough RAM for all variables" error. I think this is strange, there should be 15% ram left, shouldn't it? Or doesn't the compiler count with the memory defined in #reserve?
The compiler version: 4.038
Any help would be thankful.
BW Miniman

[rnielsen]

The program memory is made up of 'pages'. Each page can only hold up to so much information. Even though the 'total' usage is only 85% the page, that holds the section of code you are working on, might be 99% full. When you make that last declaration it could be over-filling that page.

If there is anything you can move out of that area, (made into a separate function), then there might be enough room for you to add other things needed in there.

Ronald