2.4 Makefile doubts

[Ed Co <edityacomm_knb@xxxxxxxxx>]

Hi All,

 

(a) The 2.4 kernel's drivers/net/Makefile has 4 lines in the beginning as follows:

 

obj-y    :=

obj-m   :=

obj-n    :=

obj-      :=

 

Are these lines necessary; they seem to be clearting the variables. What happens if these 4 lines are not present?

 

(b) Also the TULIP objects are included in the final object using the following rules

 

ifeq ($(CONFIG_TULIP_,y)

   obj-y += tulip/tulip.o

endif

 

Any reason why the normal rule as shown below is not used

obj-$(CONFIG_TULIP) += tulip/tulip.o

 

Has it got to do anything with tulip being a subdirectory?

 

Thanks in advance

Ed

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