How to update LLVM & Clang on Mac OSX?

Question

On my version of Mac OSX (Lion 10.7.1, XCode 4.1), there is LLVM 3.0svn and Clang 2.1. The current versions are LLVM 3.0 and Clang 3.0.

From the XCode web site, it s

Answer 1

Software vendors are traditionally conservative about updating build tools and with good reason. If you want to use the latest publicly-supported versions of build tools supplied and modified by Apple, you should stick to those in the latest version of Xcode for the OS X release you are running. There are usually good reasons why Apple has not yet updated to the latest cutting-edge versions of open source components, like serious bugs. If you don't need the Apple-supplied modifications and don't mind living on the edge - i.e. no support from Apple and possibly (re-)discovering known problems - and are not planning to ship compiled files to other people's systems, you could install your own versions in, say, /usr/local/bin or by using third-party package managers, like MacPorts http://www.macports.org/ports.php?by=name&substr=clang). You should definitely not try to replace the files at the paths installed by Xcode. Is it worth it? Only you can decide that.

Answer 2

On Mountain Lion 10.8.2 with XCode 4.6, the versions are:

$ clang --version
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

$ clang++ --version
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0 
Thread model: posix

$ llvm-g++ --version
i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ llvm-gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

You can update XCode for Lion too from App Store or Apple Developer Account direct download, and install the command line tools, which will update clang & llvm to above versions.

Answer 3

The web site is incorrect. Xcode 4.2.1 and 4.2 include LLVM 3.0 and clang 3.0:

clang --version
Apple clang version 3.0 (tags/Apple/clang-211.12) (based on LLVM 3.0svn)

clang++ --version
Apple clang version 3.0 (tags/Apple/clang-211.12) (based on LLVM 3.0svn)

llvm-g++ --version
i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)

llvm-gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)

Answer 4

You can comfortably build your own LLVM using homebrew:

brew install llvm

There are also versioned packages in case you need a specific version:

• llvm@3.7
• llvm@3.8
• llvm@3.9
• llvm@4

Answer 5

I highly recommend against replacing the system compiler on macOS:

Many build processes you will see (e.g. Xcode) rely on Apple-specific extensions. For example, last I checked Apple have their own linker.

Also, Linuxes do not enforce binary compatibility -- generally, people build software from source, or download specific binaries for each operating system version. As an end-user (as opposed to developer/professional user) operating system, macOS goes to great effort to maintain compatibility with binaries built on older macOS versions.

Replacing the compiler, or worse, system libraries, will break these compatibility guarantees. It may also break your system in subtle, non-obvious ways.

But feel free to install a second copy of clang in /usr/local or so and explore new features, but leave the system compiler alone.

Also note that Apple do not support submitting software to the app stores that aren't built with Xcode and the compiler it includes. While you may go unnoticed if you do that, you may get rejected during app store review if your compiler fails to do anything that Apple's compiler does.

Answer 6

OS X Update version 10.9.2 brings XCode to version 5.1 (5B130a), and clang to the latest stable (for OS X):

$ clang --version
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

On my Mac llvm-gcc and llvm-g++ are symlinks to this clang:

lrwxr-xr-x  1 root  wheel     5B 25 Oct 16:48 /usr/bin/llvm-gcc -> clang
lrwxr-xr-x  1 root  wheel     7B 25 Oct 16:48 /usr/bin/llvm-g++ -> clang++

My latest R installation is configured to use llvm-gcc-4.2 which would cause error when building SHLIB. Creating symlinks for llvm-gcc-4.2 and llvm-g++-4.2 the same way, instead of replacing LLVM or CLANG, is enough to resolve the errors.