RFC: Make clang the default compiler on ARM

[Warner Losh]

On Mar 18, 2013, at 3:07 AM, Andrew Turner wrote:

> I would like to make clang the default compiler on ARM using the patch
> at [1]. This only affects little-endian ARM as there is no support for
> big-endian ARM in clang.
> 
> This will help me with my work to update the FreeBSD ARM ABI as I am
> planning on moving to a hard-float ABI on armv6 as all SoCs we
> are likely to support have at least a VFPv3-D16 floating point
> coprocessor. The version of gcc we have in our tree does not support
> the hard float ABI with VFP and support was added after gcc moved to
> the GPLv3 so we are usable to make use of it.
> 
> The only issue I know about is an incompatibility between gcc and clang
> with ARM EABI however this has been fixed upstream and I plan on
> bringing it into our tree before making clang the default. If anyone
> knows of any other issues please let me know now so I can look into
> them.
> 
> If nobody brings up any issues or has any objections to me doing this
> I will make clang the default earlier than 25 March (UTC+0).
> 
> Andrew
> 
> [1] http://people.freebsd.org/~andrew/clang/arm_clang_default.diff

This scares me, but we're at a great time in our schedule for it.

Warner