Suppose I have file2 that is newer than file1, and file4 is older than file3. In the trials that I did, both rules in the makefile are always executed. I'm wonder if this is always true. Or I just happen to observer this behavior?
.PHONY: all
all: file1 file2
file3: file4
touch file3
file1: file2
touch file1
touch file3
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