What is phony make?

What is phony make?

In terms of Make, a phony target is simply a target that is always out-of-date, so whenever you ask make , it will run, independent from the state of the file system. Some common make targets that are often phony are: all , install , clean , distclean , TAGS , info , check .

What are targets in makefile?

An Introduction to Makefiles

• You need a file called a makefile to tell make what to do.
• A target is usually the name of a file that is generated by a program; examples of targets are executable or object files.
• A prerequisite is a file that is used as input to create 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.

What is phony target in makefile Mcq?

2. What is phony target in the makefile? Explanation: None.

What is $( make in makefile?

The makefile is read by the make command, which determines the target file or files that are to be made and then compares the dates and times of the source files to decide which rules need to be invoked to construct the target. Often, other intermediate targets have to be created before the final target can be made.

What is target in make command?

Target is usually a executable file which get created after execution of make command. This set of dependencies gives a hierarchy showing how the source files relate to one other.

What is IFEQ in makefile?

Conditional Directives The ifeq directive begins the conditional, and specifies the condition. It contains two arguments, separated by a comma and surrounded by parentheses. Variable substitution is performed on both arguments and then they are compared.

What is the default make target?

By default, the goal is the first target in the makefile (not counting targets that start with a period). Therefore, makefiles are usually written so that the first target is for compiling the entire program or programs they describe.

What is phony target in Makefile Mcq?

What is makefile phony target?

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. Once this is done, ‘ make clean ‘ will run the recipe regardless of whether there is a file named clean .

What is a phony target in a makefile?

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 do I run makefile commands that do not represent physical files?

Make assumes its target is a file, and this makes writing Makefiles relatively easy: However, sometimes you want your Makefile to run commands that do not represent physical files in the file system. Good examples for this are the common targets “clean” and “all”.

How do you describe multiple programs in a makefile?

When one directory contains multiple programs, it is most convenient to describe all of the programs in one makefile ./Makefile. Since the target remade by default will be the first one in the makefile, it is common to make this a phony target named ‘all’ and give it, as prerequisites, all the individual programs.

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