On Mar 20, 2014, at 12:24 PM, John-Mark Gurney <j...@funkthat.com> wrote:

> Warner Losh wrote this message on Thu, Mar 20, 2014 at 11:30 -0600:
>> On Mar 20, 2014, at 8:25 AM, David Chisnall <thera...@freebsd.org> wrote:
>>> On 20 Mar 2014, at 14:08, John Baldwin <j...@freebsd.org> wrote:
>>>> No, the compiler should provide a working "wmmintrin.h" header in one of
>>>> its built-in paths if it supports the AES instructions.  This is akin to
>>>> saying that code that uses "stdio.h" should use -I/usr/src/include.
>>> It does, however our build system then explicitly says to the compiler 
>>> 'don't use your built-it paths because they may contain declarations that 
>>> contradict the FreeBSD ones' by means of the sysroot argument.  When not 
>>> using an external toolchain, we put the compiler's internal headers inside 
>>> the sysroot.
>> Sounds like we?re building the sysroot wrong then.
> I'm not familar w/ cross tools, are cross tools suppose to "just work",
> or do you still require building kernel-toolchain?  The wiki doesn't
> talk about buildkernel...  If it's still required to build
> kernel-toolchain before buildkernel, one option is to remove the
> exclusion of the _includes target from kernel-toolchain, though _includes
> doesn't appear to install the header...  It looks like it never
> goes into lib/clang to install them, though I'm not sure if it is suppose
> to or not..  If you use COMPILER_TYPE=gcc, it doesn't go into the proper
> gcc subdir to install them either…

I’m saying that whatever is building the sysroot is building it wrong. I 
haven’t looked
at the details enough to know where the fault lies. If the files aren’t there, 
that’s a bug
and adding hacks for clang is not the right way to fix the bug.

> In investigating this, it looks like we might have a make rule conflict
> in usr.sbin/bsdconfig...  It has a subdir includes, but bsd.subdir.mk
> also defines a rule includes (for building inclues) which results in
> this:
> make[4]: "/usr/src/share/mk/bsd.subdir.mk" line 85: warning: duplicate script 
> for target "includes" ignored
> make[4]: "/usr/src/share/mk/bsd.subdir.mk" line 69: warning: using previous 
> script for "includes" defined here

That’s likely an orthogonal issue…


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