Re: [PATCH] allow CROSS_COMPILE override

[Brian Murphy <brian@murphy.dk>]

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?
I can't see that this should be a problem in the arm makefile.
Perhaps I'm missing something.

/Brian