[cmake-developers] Setting source property COMPILE_DEFINITIONS

[Kornel Benko]

Am Montag, 15. Oktober 2012 um 15:40:18, schrieb Brad King <brad.king at kitware.com>
> On 10/15/2012 03:26 PM, Kornel Benko wrote:
> > Unfortunately, if "something" changes, the effect is, that _all_ sources in the relevant
> > directory are recompiled. (I expected the recompilation of x.cpp only).
> > 
> > This may depend on the build system. In my case "Unix makefiles". The reason is
> > 
> > that each object file created for this directory depends on "flags.make", which changes accordingly.
> > 
> > If one has hundreds of files in the source dir, this is less welcome.
> 
> This is a known limitation of the Makefile generator.  We cannot use
> a per-object flags.make file because some filesystems are EXTREMELY
> slow at using lots of tiny files.  There may be an issue tracker
> entry asking for this to be solved, but I don't think it ever will
> be.
> 
> -Brad

Thanks Brad. I nearly expected/feared something like this. Pity.

	Kornel
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