GCC can be used with any license ..

[Doug Mentohl]

the FSF decided long ago to allow developers to use GCC's libraries to 
compile any program, regardless of its license. Developing nonfree 
software is not good for society, and we have no obligation to make it 
easier. We decided to permit this because forbidding it seemed likely to 
backfire, and because using small libraries to limit the use of GCC 
seemed like the tail wagging the dog.

Therefore, these libraries have always had license exceptions that allow 
people to distribute the object code GCC produces under any license

http://www.gnu.org/licenses/gcc-exception-faq.html

You have permission to propagate a work of Target Code formed by 
combining the Runtime Library with Independent Modules, even if such 
propagation would otherwise violate the terms of GPLv3, provided that 
all Target Code was generated by Eligible Compilation Processes. You may 
then convey such a combination under terms of your choice, consistent 
with the licensing of the Independent Modules ..

A Compilation Process is "Eligible" if it is done using GCC, alone or 
with other GPL-compatible software, or if it is done without using any 
work based on GCC. For example, using non-GPL-compatible Software to 
optimize the GCC intermediate representation would not qualify as an 
Eligible Compilation Process.

http://lwn.net/Articles/301959/