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X-Recipient:	djgpp AT delorie DOT com
Message-ID:	<555829A6.8010502@iki.fi>
Date:	Sun, 17 May 2015 08:39:50 +0300
From:	"Andris Pavenis (andris DOT pavenis AT iki DOT fi)" <djgpp AT delorie DOT com>
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To:	djgpp AT delorie DOT com
Subject:	Re: ANNOUNCE: DJGPP 2.05 beta 1
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Reply-To:	djgpp AT delorie DOT com

On 05/16/2015 10:56 PM, Ozkan Sezer (sezeroz AT gmail DOT com) wrote:
> On 5/16/15, Andris Pavenis (andris DOT pavenis AT iki DOT fi) <djgpp AT delorie DOT com> wrote:
>> with gcc >= 4.8?
>> If we define own _rdtsc() we get duplicate definition of it when GCC own
>> header x86intrin.h is also
>> included (for new GCC version). That was the reason why I used GCC defined
>> function instead
>> of DJGPP one.
>>
>> Can you please show the error or warning messages form each
>> problematic case?
>>
>> I tried to reproduce the problems: commented out the -I$(GCC_INC_DIR)
>> additions to CFLAGS in both src/ and tests/makefile.in, compiled src
>> using my gcc5 cross-compiler and got no errors or warnings for _rdtsc()
>> Tried compiling the test programs: since I am on linux, had to do some
>> voodoo in the makefiles by changing gcc and ld to cross- versions and
>> by replacing rem.com with /bin/true, they just compiled. (of course,
>> no run tests, and found other issues, but no _rdtsc() issues.)
I do not remember exactly with which piece of software I got this problem with _rdtsc

With DJGPP own _rdtsc the following 2 includes causes compile error:

#include <x86intrin.h>
#include <time.h>

One should be able to use SSE/MMX/AVX instructions with DJGPP.

ia32intrin.h defines _rdtsc() and as result one gets duplicate definition if one includes
x86intrin.h before time.h without that change (including x86intrin.h instead
of defining _rdtsc()).

There is fortunately another way without including x86intrin.h from time.h:

ia86intrin.h contains '#define _rdtsc() __rdtsc()' and it defines __rdtsc as an inline function.
One could also undefine _rdtsc before defining our own.

Andris

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