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gcc is symbolically linked to llvm-gcc on Mac OS X Lion.
prosseek ~> ls -alF /usr/bin/gcc
lrwxr-xr-x 1 root wheel 12 Nov 12 14:39 /usr/bin/gcc@ -> llvm-gcc-4.2
How can I setup to use gcc-4.2 when gcc is called?
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All of Apple's operating systems, iOS, macOS, tvOS and watchOS, are built with LLVM technologies.
Apple ships the clang/LLVM compiler with macOS. Clang is a "front-end" that can parse C , C++ and Objective-C down to something that LLVM (referred to as a "back-end") can compile. Clang/LLVM is located in /Applications/Xcode.
You can run brew info gcc to get path where it is installed and get exact name of the binary by listing the directory. $ brew info gcc gcc: stable 11.2. 0 (bottled), HEAD GNU compiler collection https://gcc.gnu.org/ /usr/local/Cellar/gcc/11.2.
As of Xcode 4.2 in Lion, Apple no longer ships its previous version of gcc-4.2, which was in Xcode 4.1 and earlier versions. It now only ships llvm-gcc (gcc front-end with llvm code backend) and clang (clang front-end with llvm backend). While it is possible to install legacy versions of vanilla GNU gcc-4.2 from other sources, like MacPorts, (and without disturbing /usr/bin), Apple has made it clear that they aren't going to be supporting gcc anymore and that they want developers and users to move to clang.
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There seems to be a way to use gcc with Xcode 4.2 - http://caiustheory.com/install-gcc-421-apple-build-56663-with-xcode-42
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