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I'm running Ubuntu 14.04 on armhf. clang is from the standard repo:

root@tegra-ubuntu:~# apt-cache show clang
Package: clang
Priority: optional
Section: universe/devel
Installed-Size: 27
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
Original-Maintainer: LLVM Packaging Team <pkg-llvm-team@xxxxxxxxxxxxxxxxxxxxxxx>
Architecture: armhf
Source: llvm-defaults (0.21ubuntu1)
Version: 1:3.4-0ubuntu1
Replaces: clang (<< 3.2-1~exp2)
Depends: clang-3.4 (>= 3.4~rc3-1~)
Filename: pool/universe/l/llvm-defaults/clang_3.4-0ubuntu1_armhf.deb
Size: 2478
MD5sum: eadb3f7c344e364480bdf7fdd0f698ab
SHA1: ec4d0bfcad42bf536ee8d9257f8930dd32e1a261
SHA256: f6d9a8fbfc06d93cd4c1a2437114454cc1eec805a635efc490a7e1e6eec2b3de
Description-en: C, C++ and Objective-C compiler (LLVM based)
 Clang project is a C, C++, Objective C and Objective C++ front-end
 for the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler
 Collection (GCC).
 .
 Clang implements all of the ISO C++ 1998 and 2001 standards and also provides
 a partial support of C++1y.
 .
 This is a dependency package providing the default clang compiler.
Description-md5: ea1f164ac255f39c6ec78685f71ef19b
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu


Anyway, it does not produce working output. Here are some examples:

https://ci.nedprod.com/view/Boost.AFIO/job/Boost.AFIO%20Build%20POSIX_ARM_clang%203.4/9/consoleFull

This log shows how clang has the wrong default target CPU, so it outputs
unsupported ARM instructions (see the end after the warnings spew).

If I force the target cpu to a cortex-a15 it now at least compiles and
links and starts to run unit tests:

https://ci.nedprod.com/view/Boost.AFIO/job/Boost.AFIO%20Test%20POSIX_ARM_clang%203.4/7/consoleFull

... but hangs in the first unit test, and is timed out. Before you think
it the unit tests, here is the exact same thing for GCC 4.8:

https://ci.nedprod.com/view/Boost.AFIO/job/Boost.AFIO%20Test%20POSIX_ARM_GCC%204.8/7/console

The unit tests all run and pass as expected. Everything also works fine
on x86 and x64 with clang 3.4 on Ubuntu 14.04, this appears to be an
armhf misconfiguration.

Niall

** Affects: llvm-toolchain-3.4 (Ubuntu)
     Importance: Undecided
         Status: Confirmed

-- 
clang armhf in trusty simply doesn't work
https://bugs.launchpad.net/bugs/1349789
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