Re: [Qemu-devel] [PATCH] cutils: Define min and max marcos

[Samuel Thibault]

Yuval Shaia, on Mon 28 Nov 2016 00:18:26 +0200, wrote:
> On Sun, Nov 27, 2016 at 03:10:04PM +0100, Samuel Thibault wrote:
> > Yuval Shaia, on Fri 25 Nov 2016 12:31:26 +0200, wrote:
> > > -#ifndef _WIN32
> > > -#define min(x,y) ((x) < (y) ? (x) : (y))
> > > -#define max(x,y) ((x) > (y) ? (x) : (y))
> > > -#endif
> > 
> > This has protection against _WIN32, I guess that was on purpose.
> 
> I'm not following.
> Are you suggesting that this was there to prevent code from compiling when
> _WIN32 was define?

I mean that min and max are already defined on windows:

https://msdn.microsoft.com/en-us/library/windows/desktop/dd757290%28v=vs.85%29.aspx

> > Perhaps qemu should avoid risking a clash with OS-provided min/max
> > macros, by renaming these to qemu_min/max?
> 
> On MIN and MAX?

Yes.

> I have noticed some other approach which was taken in osdep.h with ifdef,
> for example:
> 193 #ifndef ROUND_UP
> 194 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
> 195 #endif

That could probably be enough for our use indeed.

Samuel