[LLVMdev] Usage of /dev/null in makefiles wrong

[Reid Spencer]

Hi Holger,

On Mon, 2007-07-23 at 09:28 +0200, Holger Schurig wrote:
>   /usr/src/llvm/llvm$ make
>   make: Warning: File `/dev/null' has modification time 4.9e+03 s 
> in the future
>   make[1]: Entering directory `/usr/src/llvm/llvm/lib/System'
>   ...
> 
> At the end of the compilation it emits something about clock skew
> detected.
> 
> The time of /dev/null on my box is weird because of udev and/or 
> time local settings. When it's created, the init scripts didn't 
> have set the right locale. So in the first few hours after I 
> turned my box on, it's timestamp is in the future.
> 
> But hey, it's odd that /dev/null is a "make" target anyway.

Three years I've been looking at these makefiles and I never noticed
that before. Truly bizarre.
> 
> 
> 
> When I change line 1474 in Makefile.rules from
> 
>   -include /dev/null $(DependFiles
> 
> to
> 
>   -include $(DependFiles

Yup, works for me too. I think someone was trying to get around
$(DependFiles) being empty, but that's what the - is for !

Reid.

> 
> then this strange and weird warning vanishes.
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