[oe] Clang cross compiler with OpenEmbedded

[Khem Raj]

Hi Roman

> On Aug 25, 2015, at 3:52 AM, Roman Khimov <roman at khimov.ru> wrote:
> 
> В письме от 25 августа 2015 01:03:07 пользователь Khem Raj написал:
>> We have put together clang as system cross compiler support into
>> OpenEmbedded, here is a writeup on how to use it in your setups.
>> 
>> http://himvis.com/using-clang-with-openembeddedyocto-project/
> 
> Do you have any plans to support scan-build analysis?

Yes but its in back burners so patches are welcome! I do use scan-build with some native application
projects but thats very simple setup to have.
I think it should be easy enough to add a class to insert the static analysis
given we can configure clang as cross compiler,

Right now my priorities are to use subset of arches e.g. x86/arm

1. Fix compile issues for OE-Core, reach to a point where all packages can build we have around 40 failing in world builds
2. Start using compiler-rt and libc++ to provide compiler c/c++ runtime
3. Repeat 1 to 2 with musl
4. Repeat 1 to 3 for remaining architectures
5. Start using other tools e.g. lldb, native linker and integrated as system wide

So this can take a while.

> 
> We have had one in Altell but with a gross hack (and even that based on OE
> classic) --- we'd built native clang and then used a special task between
> configure and compile stages that copied its script (run.do_scanbuild) into
> another one, mangled it heavily to override $CC and $CXX, and after that ran
> that script under scan-build (with --use-cc and --use-c++ pointing to the
> proper GCC toolchain), then reconfigured again for normal build.
> 
> That worked with some exceptions and allowed us to make static analysis of our
> whole build, but it was kludgy and not that efficient. I guess that with a
> proper cross-compiling Clang toolchain things could be done way more easily
> right at the compile stage.

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