HEADS UP: merged llvm/clang 3.4

[Dimitry Andric]

On 28 Mar 2014, at 23:59, Kai Wang <kaiw at FreeBSD.org> wrote:
> On Thu, Mar 27, 2014 at 11:03:11PM -0400, Mark Johnston wrote:
>> On Thu, Mar 27, 2014 at 6:32 PM, Dimitry Andric <dim at freebsd.org> wrote:
>>> On 27 Mar 2014, at 01:22, Mark Johnston <markj at freebsd.org> wrote:
...
>>>> DTrace seems to no longer work properly on stable/10; I get errors like
>>>> the following
>>>> 
>>>> dtrace: invalid probe specifier pid$target::malloc:entry{ }:
>>>> "/usr/lib/dtrace/io.d", line 49: cannot find type: struct devstat*: Type
>>>> information is in parent and unavailable
...
> I extracted a patch for ctfconvert from -head and adapted it to the
> old libdwarf in stable/10. The patch fixes some type parsing bugs for
> ctfconvert with Clang 3.4 objects, which might be related to your
> DTrace issue, but I'm not sure...
> 
> The patch is here:
> 
>   http://people.freebsd.org/~kaiw/ctfconvert-stable10.patch
> 
> (It should apply to stable/10. Both world and kernel needs recompile)

Thanks!  I have merged this to stable/10, and (slightly modified) to
stable/9, in r263915.  I have verified that on both branches, simple
dtrace commands like:

  dtrace -n 'syscall:::entry { @num[execname] = count(); }'

work as expected.  I assume DTrace will now work OK, but any other more
extensive verification by somebody familiar with DTrace is welcome.

Note that you *must* first build and install at least the CTF tools,
before building a kernel, otherwise the broken versions from /usr/bin
will still be used.  This is actually a problem in our kernel build
tools stage, but a solution for that is still missing.

-Dimitry

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