Mac OS X Yosemite Version 10.10.1
Updating gcc on Mac OS X can be very tricky. The current version of gcc on my mac was `4.2.1`. I used homebrew to install the latest version `brew install gcc`, which installed `4.9.2`, but checking `gcc —version` still shows `4.2.1`. I followed instructions from a couple of blog posts to get the system point to 4.9.2 but they did not seam to be successful.
$ gcc --version
Configured with: —prefix=/Applications/Xcode.app/Contents/Developer/usr —with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posixSo I decided to manually install the latest version of gcc from gnu.org
=> Visit: https://gcc.gnu.org/mirrors.html and select a mirror
=> I picked: http://mirrors-usa.go-parts.com/gcc/
=> clicked on releases: http://mirrors-usa.go-parts.com/gcc/releases/
=> selected http://mirrors-usa.go-parts.com/gcc/releases/gcc-4.9.2/
=> downloaded gcc-4.9.2.tar.gz (http://mirrors-usa.go-parts.com/gcc/releases/gcc-4.9.2/)
Open iTerm/Terminal and cd into the download and install (took me about 45 minutes)
$ cd ~/Downloads/gcc-4.9.2
$ ./configure; make; make install