[TESTING]: ClangBSD branch needs testing before the import to HEAD

[Kostik Belousov]

On Tue, Jun 01, 2010 at 10:46:54AM +1000, Lawrence Stewart wrote:
> On 06/01/10 09:25, James R. Van Artsdalen wrote:
> [snip interesting history]
> 
> >I do suggest modifying the FreeBSD build process so that uname -a shows
> >the compiler and its version for both the kernel and userland.
> 
> Reading through this discussion, I wanted to draw attention to this 
> footnote in James' email. It sounds like a sensible and useful 
> suggestion that would go some way to addressing Kostik's concerns about 
> knowing whether a kernel bug report was related to a gcc or clang built 
> kernel.

This is unsufficient. What could work is if clang provided some common
symbol into all .o files generated by it, e.g. __clang_compiled. And
then kernel considered tainted with corresponding banner printed when
weak reference to that symbol is resolved to non-zero. This does not
handle modules and does not cleanly handle usermode runtime (libc,
libthr, rtld etc).

I do not care about users busting their systems by using alternative
compilers and/or mixed builds. I worry about wasting developers time
chasing bugs that are not bugs in the FreeBSD system. As an example
see low-visible thread about sig11 during buildworld.
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