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
