Jan 27, 2010 · PHONY forces a label/file in a Makefile to be built if it's part of the topological-sort of whatever your target is. That is to say, if you have a 'cleanup:' label that is set phony, and the your install label is defined with cleanup as a prerequisite - i.e. 'install: cleanup', cleanup will always be run when the Makefile attempts to build ...

Dec 11, 2019 · .PHONY is never overridden. Like any other target, each new .PHONY definition adds more prerequisites to the existing list. No, there is no best practice that I'm aware of. Both work identically (except one has a variable defined, which might be useful for other things besides .PHONY, and one doesn't). For the same reason there's no need for a ...

Jun 12, 2017 · .PHONY: a a: do someting a .PHONY: b b: do someting b .PHONY: c c: do someting c Or:.PHONY: a b c a: do someting a b: do someting b c: do someting c The first option is cumbersome, and the second option is prone to error, when future me adds a target and forget to declare it as PHONY.

Dec 3, 2013 · A .PHONY target can have only dependencies, without any rule. In this case, make will not execute any rule, but will check if the dependencies are satisfied (and, if not, will execute their rules). In this case, make will not execute any rule, but will check if the dependencies are satisfied (and, if not, will execute their rules).

Sep 7, 2022 · But if you are willing to depend specifically on GNU make (which your references to .PHONY and % suggest) then you can do at least a little better than what is described in the question. For example, define a variable containing the varying stems of your target names, and expand that to a list of prerequisites for .PHONY:

Oct 28, 2015 · .PHONY tells GNU make the "all" target is phony - you don't REALLY intended for a file called "all" to be created and it should build the dependencies regardless if a file called "all" exists or not. Added later: My example with all and prog1 above was not correct although the general idea is true. Here is a much simple example

Apr 25, 2022 · Is the only purpose of all being listed as a prerequisite of .PHONY that I can still remake all three programs even if I accidentally, in the unlikely case, create a file in the same directory named all? You seem doubtful, but yes. That is the only purpose served by declaring all phony in that example. As the manual section you linked explains:

Asumamos que tienes el target "install", el cual es muy común en los makefiles. Si no usas .PHONY, y existe un archivo llamado "install" en el mismo directorio que el Makefile, entonces el comando make install no hará nada. Esto ocurre porque Make interpreta la regla como "ejecuta esta-y-esta receta para crear el archivo llamado install".

Apr 13, 2015 · Anyway, this question seems to be answered quite extensively behind the link you posted. test should be phony so that touch test; make test doesn't claim that test is up to date. What exactly is still unclear? So the answer is: "Yes, I need to add test to the .PHONY, because executing the command touch test would break this make command.

Aug 15, 2016 · Phony targets are not detected automatically by the make system - they must be identified by you, using the .PHONY target. Sensible phony targets include all and clean - these don't correspond to real files, but to actions you want the makefile to do. Here's how to explain this to make:.PHONY: all clean install test