differnce between += and := in Makefile obj-m line

["Amogh Hooshdar" <amoghhooshdar@xxxxxxxxx>]

I found two types of Makefiles in some tutorials.

One was like this:-

obj-m := hello-1.o

Other was like this:-

obj-m += hello-1.o

Both generated .ko files properly and I could insmod and rmmod the ko
successfully. Please explain what is the difference between := and +=
?

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