Re: [Qemu-devel] [PATCH] cpu-defs.h: pull in qemu-common.h for HOST_LONG_BITS

["Andreas Färber" <afaerber@suse.de>]

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Am 18.07.2012 14:13, schrieb Mike Frysinger:
> On Monday 16 July 2012 01:26:50 Stefan Weil wrote:
>> Am 15.07.2012 23:54, schrieb Mike Frysinger:
>>> On Sunday 15 July 2012 15:34:33 Stefan Weil wrote:
>>>> Am 15.07.2012 22:25, schrieb Mike Frysinger:
>>>>> This file uses the define HOST_LONG_BITS, but doesn't
>>>>> explicitly include qemu-common.h for it leading to build
>>>>> warnings for some setups: In file included from
>>>>> qemu/target-bfin/cpu.h:17,
>>>>> 
>>>>> from qemu/cputlb.c:21: qemu/cpu-defs.h:83:5: warning:
>>>>> "HOST_LONG_BITS" is not defined
>>>>> 
>>>>> Signed-off-by: Mike Frysinger <vapier@gentoo.org> ---
>>>>> 
>>>>> cpu-defs.h |    1 + 1 file changed, 1 insertion(+)
>>>>> 
>>>>> diff --git a/cpu-defs.h b/cpu-defs.h index f49e950..0d6018d
>>>>> 100644 --- a/cpu-defs.h +++ b/cpu-defs.h @@ -28,6 +28,7 @@
>>>>> 
>>>>> #include <inttypes.h> #include <signal.h> #include
>>>>> "osdep.h"
>>>>> 
>>>>> +#include "qemu-common.h"
>>>>> 
>>>>> #include "qemu-queue.h" #include "targphys.h"
>>>> 
>>>> No. Of course this works, but I don't think that it is
>>>> reasonable to include qemu-common.h in every *.h file. There
>>>> are already too many of them.
>>>> 
>>>> target-bfin/cpu.h should start like all other cpu.h files
>>>> with
>>> 
>>>> these include statements:
>>> sorry, but that's fragile junk.  if a header file uses defines
>>> from another header file, it should be including it. -mike
>> 
>> There are different ways how things can be done.
>> 
>> Normally, I agree with you that each header file should be
>> complete, but that's not the QEMU style.
>> 
>> In your special case, it's more important to keep all */cpu.h
>> similar. qemu/target-bfin/cpu.h is still not part of the official
>> QEMU code, so it can be fixed before it is committed.
> 
> a lot of existing files in the top level pull in qemu-common.h.  i
> don't think this is a special case considering it's the first
> failure i've seen since i started the Blackfin port over a year
> ago.

Long-term the cpu-defs.h header should go away, so moving stuff into
it and dropping it elsewhere seems not the best of ideas.

qemu-common.h includes cpu.h under some circumstances, which will
include cpu-defs.h, so a circular dependency, not a good idea either.

CPU is pretty tricky terrain. I've been working on improving it but
progress is slow because a solution for one thing tends to conflict
with someone else's work...

Andreas

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