Clang and the default compiler in OS X Lion

compiler-construction, default, osx-lion, osx-snow-leopard

Solution

gcc is symlinked to llvm-gcc-4.2 on Lion.

lrwxr-xr-x  1 root  wheel  12 Jul 21 20:51 /usr/bin/gcc -> llvm-gcc-4.2
lrwxr-xr-x  1 root  wheel  12 Jul 21 20:51 /usr/bin/g++ -> llvm-g++-4.2

You can probably remove those environment variables without much harm.

Problem

In OS X Snow Leopard (10.6) I used the following lines in `~/.bashrc` to force compilation with clang instead of standard gcc: ``` # Set Clang as the default compiler for the system export CC=clang export CFLAGS=-Qunused-arguments export CPPFLAGS=-Qunused-arguments ``` I also (occasionally) had to use the following lines to use llvm-gcc when clang would fail to compile certain things (PostgreSQL was guilty of this for a long time): ``` # Set LLVM GCC as the default compiler for the system export CPP='llvm-gcc-4.2' export CC='llvm-gcc-4.2' export CXX='llvm-g++' ``` On OS X Lion (10.7), are these lines still required? Is llvm-gcc (or clang) the default compiler for the system? Or will these lines still need to live in my `~/.bashrc`?

Original source