RFC: Building RTEMS/RISC-V with LLVM/Clang

[Sebastian Huber]

Hello,

I work currently on a new build system based on waf and Doorstop. It 
would be good to have the clang support at the top level of the build 
system. Doing this for the current build system is probably a waste of 
time. In general, I am fine with your changes.

It would be great if you could try to figure out how this works with 
waf. Please let me know if you have time for this.

You can find a prototype implementation of the new build system here:

https://git.rtems.org/sebh/rtems.git/commit/?h=build

I do forced pushes to this branch.

You can test it with:

git clone git://git.rtems.org/sebh/rtems.git
cd rtems
git checkout --track origin/build
./waf bsp_defaults --rtems-bsps=riscv > bsps.ini
./waf configure
./waf

Adding the clang support could be done with a command line option, see 
function options() in wscript. Depending on the option, clang instead of 
gcc must be found in configure().

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
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