Re: [PATCH] xen: Don't use -nostdinc flags with CLANG

[Julien Grall <julien.grall@linaro.org>]

(Add George as release manager)

On 11/02/14 13:59, Tim Deegan wrote:
> At 13:20 +0000 on 11 Feb (1392121252), Julien Grall wrote:
>>
>>
>> On 11/02/14 12:59, Tim Deegan wrote:
>>> Are you using a very old version of clang?  As 06a9c7e points out,
>>> our current runes didn't work before clang v3.0.
>>
>> I'm using clang 3.5 (which have other issue to compile Xen), but I have
>> also tried 3.0 and 3.3.
>>
>>> If not, rather than chasing this around any further, I think we should
>>> abandon trying to use the compiler-provided headers even on linux.
>>> Does this patch fix your build issue?
>>>
>>> commit e7003f174e0df9192dde6fa8d33b0a20f99ce053
>>> Author: Tim Deegan <tim@xen.org>
>>> Date:   Tue Feb 11 12:44:09 2014 +0000
>>>
>>>       xen: stop trying to use the system <stdarg.h> and <stdbool.h>
>>
>> With this patch, -iwithprefix include is not necessary now. I wondering
>> if we can remove it from the command line.
>
> Yes, I think so.
>
>>>       We already have our own versions of the stdarg/stdbool definitions, for
>>>       systems where those headers are installed in /usr/include.
>>>
>>>       On linux, they're typically installed in compiler-specific paths, but
>>>       finding them has proved unreliable.  Drop that and use our own versions
>>>       everywhere.
>>>
>>>       Signed-off-by: Tim Deegan <tim@xen.org>
>>
>> This patch is working fine to build xen clang 3.0, 3.3.
>> I have others issue to build with clang 3.5.
>>
>> Tested-by: Julien Grall <julien.grall@linaro.org>
>
> Great!  Assuming you'll have a series of patches to fix the clang-3.5
> build, do you want to just take this into that series, and drop the
> -iwithprefix at the same time?

If it's possible I'd like this patch goes in Xen 4.4 to fix build with 
official version of clang (until 3.4).

Clang 3.5 is still under development, so I don't think it's important to 
have support for it in Xen 4.4.

Cheers,

-- 
Julien Grall