llvm dev - May 2014 - [LLVMdev] Installing LLVM/Clang/LLDB 3.4 on RHEL 6.2

The lab I work for uses RHEL 6.2; this means the versions of GNU
compilers and libraries such as libc that came with the OS are too old
to use newer C++; this is also a problem when trying to build LLDB
because it can't find <atomic>.

We don't really need to use GCC as far as I can tell; we should be
able to use libc++, libc++abi and libc++rt and avoid using GCC at all,
right? With that said, we have several newer versions of GCC (4.6,
4.7.2 and 4.8.2) installed to alternative locations; I'm just not sure
how to hook them up when building LLVM/Clang and couldn't find build
options for it.

tl;dr Is there documentation somewhere on how to build LLVM/Clang/LLDB
without using libstdc and libstdc++?

> tl;dr Is there documentation somewhere on how to build LLVM/Clang/LLDB
> without using libstdc and libstdc++?
AFAIK the usual way of doing this is to pass the CXX and CC environment
variables to CMake or the configure script.

CMake
=====
$ mkdir build
$ cd build
$ CXX=/path/to/new/g++  CC=/path/to/new/gcc cmake /path/to/llvm/sourcetree
$ make -j<number>

Configure script/make
==================
$ mkdir build
$ cd build
$ CXX=/path/to/new/g++  CC=/path/to/new/gcc
/path/to/llvm/sourcetree/configure
$ make -j<number>
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