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Date: Fri, 11 Jan 2013 20:53:02 +0200
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: gcc-4.8.0 and DJGPP time.h
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> Date: Fri, 11 Jan 2013 18:51:57 +0200
> From: Andris Pavenis <andris DOT pavenis AT iki DOT fi>
> 
> #if ((__GNUC__==4 && __GNUC_MINOR__>=8) || (__GNUC__>4))
> #include <x86intrin.h>
> #else
> 
> current definitions of _rdtsc goes here
> 
> #endif
> 
> Does such approach look OK?

Yes, but please put there a comment saying that _rdtsc is defined in
GCC 4.8 and later by that header.