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This article is about how to use the make command in Linux. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Make is a very important compilation command in linux system. We often use make or makeinstall whether we develop the project or install the application software. With make tools, we can break down large development projects into more manageable modules.

The following is the test environment used in this article for the Linux make command example:

OS-- Ubunut 13.04 Shell-- Bash 4.2.45 Application-- GNU Make 3.81 the following are the contents of the project:

$ls anotherTest.c Makefile test.c test.h the following is the content of Makefile:

All: test test: test.o anotherTest.o gcc-Wall test.o anotherTest.o-o test test.o: test.c gcc-c-Wall test.c anotherTest.o: anotherTest.c gcc-c-Wall anotherTest.c clean: rm-rf * .o test now let's look at some examples of make command applications under Linux:

1. A simple example to compile the entire project, you can simply use make or take the target all after the make command.

$make gcc-c-Wall test.c gcc-c-Wall anotherTest.c gcc-Wall test.o anotherTest.o-o test you can see the dependency created by the make command for the first time and the actual target.

If you look at the contents of the directory again, there are some .o files and execution files in it:

Ls anotherTest.c anotherTest.o Makefile test test.c test.h test.o now, suppose you make some changes to the test.c file and re-use make to compile the project:

Make gcc-c-Wall test.c gcc-Wall test.o anotherTest.o-o test you can see that only test.o has been recompiled, while the other Test.o has not been recompiled.

Now clean up all the target files and executable test, you can use the target clean:

$make clean rm-rf * .o test $ls anotherTest.c Makefile test.c test.h you can see that all .o files and executable test have been deleted.

two。 With the-B option to make all targets always re-established so far, you may notice that the make command does not compile files that have not changed since the last compilation, but if you want to override the default behavior of make, you can use the-B option.

Here is an example:

$make make: Nothing to be done for `all'. Make-B gcc-c-Wall test.c gcc-c-Wall anotherTest.c gcc-Wall test.o anotherTest.o-o test you can see that although the make command does not compile any files, make-B forces all target files and the final execution file to be compiled.

3. Use the-d option to print debugging information if you want to know what make actually did during execution, use the-d option.

This is an example:

$make-d | more GNU Make 3.81 Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This program built for x86_64-pc-linux-gnu Reading makefiles... Reading makefile `Makefile'... Updating makefiles... . Considering target file `Makefile'. Looking for an implicit rule for `Makefile'. Trying pattern rule with stem `Makefile'. Trying implicit prerequisite `Makefile.o'. Trying pattern rule with stem `Makefile'. Trying implicit prerequisite `Makefile.c'. Trying pattern rule with stem `Makefile'. Trying implicit prerequisite `Makefile.cc'. Trying pattern rule with stem `Makefile'. Trying implicit prerequisite `Makefile.C'. Trying pattern rule with stem `Makefile'. Trying implicit prerequisite `Makefile.cpp'. Trying pattern rule with stem `Makefile'. -- More-- this is a very long output, and you can see that I used the more command to display the output page by page.

4. Using the-C option to change directories you can provide different directory paths for the make command, which will be changed before looking for Makefile.

This is a directory, assuming you are in the current directory:

Ls file file2 frnd frnd1.cpp log1.txt log3.txt log5.txt file1 file name with spaces frnd1 frnd.cpp log2.txt log4.txt but the Makefile file of the make command you want to run is saved in the.. / make-dir/ directory, you can do this:

$make- C.. / make-dir/ make: Entering directory `/ home/himanshu/practice/make-dir' make: Nothing to be done for `all'. Make: Leaving directory `/ home/himanshu/practice/make-dir you can see that the make command is first cut to a specific directory, executed there, and then switched back.

5. Think of other files as Makefile with the-f option. If you want to rename the Makefile file, such as my_makefile or something else, we want make to treat it as Makefile, using the-f option.

Make-f my_makefile in this way, the make command chooses to scan my_makefile instead of Makefile.

Thank you for reading! This is the end of this article on "how to use make commands in Linux". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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