You can compile it yourself with this Makefile or save yourself 2,5 hours, I created a signed installer package with GCC 4.7.2 for Mac OSX Mountain Lion, you can download it from my website: https://www.litebeam.net/macosx/macosx/gcc.html

You can compile it yourself with this Makefile. If you want to save yourself 2-5 hours, I created a signed installer package with GCC 4.7.2 for Mac OSX Mountain Lion which you can download here.