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12.13 The ‘obj/’ Subdirectory and Make

Never name one of your subdirectories ‘obj/’ if you don’t like surprises.

If an ‘obj/’ directory exists, BSD make enters it before reading the makefile. Hence the makefile in the current directory is not read.

 
$ cat Makefile
all:
        echo Hello
$ cat obj/Makefile
all:
        echo World
$ make      # GNU make
echo Hello
Hello
$ pmake     # BSD make
echo World
World

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