a strange make rule

[Lin George]

Hello everyone,


Here is a sample make file.

SRC=foo.c
PROC=$(SRC:%.c=%.o)
TARGET=$(PROC:%.o=$(TARGET_DIR)/%.o)

I know the first two lines mean compile *.c defined in
SRC to *.o. But what does the 3rd line mean? Convert
*.o generated by PROC rule still to *.o? I am confused
that why convert *.o to *.o itself?


thanks in advance,
George

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