making all rules depend on the Makefile itself

user_17945 0
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When I change a Makefile, its rules may have changed, so they should be reevaluated, but make doesn't seem to think so.

Is there any way to say, in a Makefile, that all of its targets, no matter which, depend on the Makefile itself? (Regardless of its name.)

I'm using GNU make.

gnu-make makefile
3 Answers

Since GNU make version 4.3 it is now possible with the use of those two special variable:

  1. .EXTRA_PREREQS
    • To add new prerequisite to every target
  2. MAKEFILE_LIST
    • To get the path of the make file

To have every target depend on the current make file:

Put near the top of the file (before any include since it would affect the MAKEFILE_LIST) the following line:

.EXTRA_PREREQS:= $(abspath $(lastword $(MAKEFILE_LIST)))

To have every target depend on the current make file and also the make files which were included

Put the following line at the end of your file:

    .EXTRA_PREREQS+=$(foreach mk, ${MAKEFILE_LIST},$(abspath ${mk}))
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