Re: [PATCH] allow CROSS_COMPILE override

[Jun Sun <jsun@mvista.com>]

On Thu, Feb 20, 2003 at 11:03:38PM +0100, Brian Murphy wrote:
> Jun Sun wrote:
> 
> >Is this allowed?  Can't find any such usage in kernel other
> >than the worrisome comment below:
> >
> >arch/arm/Makefile:# Grr, ?= doesn't work as all the other assignment 
> >operators do.  Make bug?
> >
> >
> >  
> >
> The arm code does this:
> 
> # Only set INCDIR if its not already defined above
> # Grr, ?= doesn't work as all the other assignment operators do.  Make bug?
> ifeq ($(origin INCDIR), undefined)
> INCDIR          := $(MACHINE)
> endif
> 
> where the make docs say:
> 
> INCDIR ?= $(MACHINE)
> 
> is the same as
> 
> ifeq ($(origin INCDIR), undefined)
> INCDIR          = $(MACHINE)
> endif
> 
> which means INCDIR will reflect changes to MACHINE.
> The := form sets INCDIR once and for all. What do you want?

':=' is fine, as long as "?=" is deemed appropriate for kernel and hackers.

Jun