Contents
What is phony in make file?
A phony target is one that is not really the name of a file; rather it is just a name for a recipe to be executed when you make an explicit request. There are two reasons to use a phony target: to avoid a conflict with a file of the same name, and to improve performance.
What is phony all?
Generally all targets in your Makefile which do not produce an output file with the same name as the target name should be PHONY. This typically includes all , install , clean , distclean , and so on.
How are rules specified in make file?
A rule appears in the makefile and says when and how to remake certain files, called the rule’s targets (most often only one per rule). It lists the other files that are the prerequisites of the target, and the recipe to use to create or update the target.
What is Makecmdgoals?
MAKECMDGOALS. The targets given to make on the command line. Setting this variable has no effect on the operation of make.
Are there any rules for executing a phony file?
No file targets should be prerequisites of .PHONY. phony targets should not be prerequisites of file targets. .PHONY: all all: echo “Executing all …”
Where do you find rules in GNU make?
A ruleappears in the makefile and says when and how to remake certain files, called the rule’s targets(most often only one per rule). It lists the other files that are the prerequisitesof the target, and the recipeto use to create or update the target.
Who are the phony targets in GNU make?
The best explanation is the GNU make manual itself: 4.6 Phony Targets section. .PHONY is one of make’s Special Built-in Target Names. There are other targets that you may be interested in, so it’s worth skimming through these references.
How to make a phony program in GNU make?
For example: all : prog1 prog2 prog3 .PHONY : all prog1 : prog1.o utils.o cc -o prog1 prog1.o utils.o prog2 : prog2.o cc -o prog2 prog2.o prog3 : prog3.o sort.o utils.o cc -o prog3 prog3.o sort.o utils.o Now you can say just ‘ make ’ to remake all three programs, or specify as arguments the ones to remake (as in ‘ make prog1 prog3 ’).