Cmake command example

Posted on 09.04.2021 Comments

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How to Create a Simple Makefile - Introduction to Makefiles

If nothing happens, download the GitHub extension for Visual Studio and try again. CMake is a cross-platform open-source meta-build system which can build, test and package software. The examples are laid out in a tutorial like format. The first examples are very basic and slowly increase in complexity drawing on previous examples to show more complex use cases. These examples have been tested on Ubuntu For examples that use CMake version 2.

For examples that use CMake version 3. Docker containers with all requirements and various versions of CMake are generated to help make testing the examples easier. For more details on build and running the docker containers dockerfiles.

There are many CMake tutorials and examples online. The list below includes links to some of these which I have found helpful in my CMake journey. Modern CMake Slides. Official CMake Wiki. CMake Useful Variables. Derek Molloy - Intro to CMake. Common CMake Anti-Patterns. Using clang static analyser with CMake. CMake Tips. John Lamp - CMake Tutorial. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. CMake Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 7e0ec02 Mar 24, When trying to learn CMake I could not find any good introduction.

The CMake documentation is quite comprehensive but not suitable for a beginner. There are some useful tutorials linked on the CMake Wiki but most of them only cover very specific problems or are too basic.

So I wrote this short CMake introduction as a distilled version of what I found out after working through the docs and following stackoverflow questions.

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Its a work in progress and I will try to continuously improve it. CMake is a meta build tool that allows you to generate native build scripts for a range of platforms:. See the full list of CMake generators. Lets assume we have a simple app with a single. We by creating a CMakeLists. Thats all we need to be able to build our app with any of the available generators.

CMake supports out-of-source builds — so all our compiled code goes into a directory separate to the sources. To start a build we create a new folder:. By default cmake will install our build into the system directories. To define a custom install directory we simply pass it to cmake:. To run the build script you can simply use the Makefile:. We can now run our binary from the install directory:. If we wanted to use a different generator we pass it to cmake using the -G parameter:.

This will output a readily configured Xcode project to build our app. To build a library we use a similar script:.

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CMake will build the library as libtest. We also include our public header file into the install step and tell cmake to put it into include. Instead of a static library we can build a shared lib as well:. We can extend our executable from above by linking it to our libray libtest. Now, we can use the library defined in CMakeLists.

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CMake will make sure to first build test before linking it to myapp. While CMake enjoys increasing interestthere are still plenty of libraries using native build systems like Unix Makefiles.

You can make use of them in your CMake project without having to re-write their build scripts. In our case we want to make use of the luajit library which is built using a Makefile. It will only be built if we add a dependency to it.

cmake command example

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CMake by Example. Mirko Kiefer Follow. Traveler, developer and drone pilot. My publication where I write about travel and software. See responses 9. More From Medium. Related reads. Sander Mertens.A target created in the same directory CMakeLists. In makefile terms this creates a new target in the following form:.

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Specify the files the command is expected to produce but whose modification time may or may not be newer than the dependencies. If a byproduct name is a relative path it will be interpreted relative to the build tree directory corresponding to the current source directory. Explicit specification of byproducts is supported by the Ninja generator to tell the ninja build tool how to regenerate byproducts when they are missing. It is also useful when other build rules e.

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Ninja requires a build rule for any generated file on which another rule depends even if there are order-only dependencies to ensure the byproducts will be available before their dependents build. Specify the command-line s to execute at build time. If more than one COMMAND is specified they will be executed in order, but not necessarily composed into a stateful shell or batch script.

cmake command example

The optional ARGS argument is for backward compatibility and will be ignored. Additionally a target-level dependency will be added so that the executable target will be built before any target using this custom command. However this does NOT add a file-level dependency that would cause the custom command to re-run whenever the executable is recompiled. References to target names in generator expressions imply target-level dependencies, but NOT file-level dependencies.

Specify files on which the command depends. Additionally, if the target is an executable or library a file-level dependency is created to cause the custom command to re-run whenever the target is recompiled. The second signature adds a custom command to a target such as a library or executable. This is useful for performing an operation before or after building the target.

The command becomes part of the target and will only execute when the target itself is built. If the target is already built, the command will not execute. This defines a new command that will be associated with building the specified target.

When the command will happen is determined by which of the following is specified:.

cmake command example

This documents an old version of CMake. Click here to see the latest release. Quick search.

cmake command example

Created using Sphinx 1.The HEX option causes data to be converted to a hexadecimal representation useful for binary data. Binary data in the file are ignored.

The options are:. Intel Hex and Motorola S-record files are automatically converted to binary while reading unless this option is given. Consider strings of a given encoding. Please note that this sub-command is not intended to be used in project mode. For example:. Name of the variable in which to store the list of unresolved dependencies.

If this variable is not specified, and there are any unresolved dependencies, an error is issued. Variable prefix in which to store conflicting dependency information. Dependencies are conflicting if two files with the same name are found in two different directories. List of executable files to read for dependencies. List of library files to read for dependencies. List of loadable module files to read for dependencies.

They are typically used by calling dlopen at runtime rather than linked at link time with ld -l. List of additional directories to search for dependencies. On Linux platforms, these directories are searched if the dependency is not found in any of the other usual paths.

If it is found in such a directory, a warning is issued, because it means that the file is incomplete it does not list all of the directories that contain its dependencies. On Windows platforms, these directories are searched if the dependency is not found in any of the other search paths, but no warning is issued, because searching other paths is a normal part of Windows dependency resolution.

On Apple platforms, this argument has no effect. On other platforms, it has no effect. The following arguments specify filters for including or excluding libraries to be resolved. See below for a full description of how they work. These arguments can be used to blacklist unwanted system libraries when resolving the dependencies, or to whitelist libraries from a specific directory.

The filtering works as follows:. Otherwise, resolution proceeds to step 6.Thank you very much. This was very useful. That was fantastic. Absolutely perfect for getting me started with cmake on hierarchical projects that use shared libraries. Thank you!! Give this man a cookie The best write up on cmake.

Thanks again. People look for a build system to make it simpler. A complete compiler call is a lot of typing in all but the most trivial examples. You have delivered a necessary service. Yours had by far the most useful use cases and was the easiest to follow.

Great Post!! Simple and Precise!! Would be very helpful. Linking an existing static library commented out in the example does not seem to work. Have been following your blogs for years now. From being a student to a professional I still follow them many times as references.

A simple example

Keep up the awesome work, sir! Great tutorial! It was really well explained. How about a part 2? I would like to know how to use cmake for a project with multiple modules or subdirectories. And then each subdirectory would create a shared library where a main program would link to.

CMake projects in Visual Studio

The main program would reside in the same project as the shared libraries. It is very usefull. Now I understood about cmake. I already contacted you through the mail. I have been following from past one years. Just another fan of this post wanting to say I really appreciate your exposition!By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I wonder is there a detailed documentation for some command line options, for example -H and -B which are used by generated files.

Or the "-E echo" has additional options for coloring etc. I was not able to find some documentation for this yet. The online docs are good, but there are some private-ish implementation details that we intentionally leave out of the official docs.

Command-line stuff we use from generated projects and makefiles are some of those details. For cmake -Eoptions are documented in this section.

Learn more. CMake command line option documentation Ask Question. Asked 9 years, 2 months ago. Active 10 months ago. Viewed 26k times. Is this the official version of -H and -B?

Andi Andi 2 2 gold badges 9 9 silver badges 21 21 bronze badges. Active Oldest Votes. Definitely not. You do have to look at the source code of CMake. Oren S 1, 1 1 gold badge 15 15 silver badges 30 30 bronze badges. Thanks Dave for this information.

To be honest I'm very interested in some of the hidden command line options because it is helpful for my own set of combinded projects. Especially the posibility to color echo output helps to read the makefile messages. And the possibility to call cmake for out-of-source build without creating the build-dir first with -B and -H sound very interesting.

Maybe you will publish it in future versions. Why would you do this? Why would you intentionally make things hard? I don't think the CMake developers have intentionally made things difficult. And I'm quite certain that is not one of their goals DLRdave Perhaps, for those interested, you could reference where these options can be found in the source?

Antonio Antonio I cannot confirm the your doubts regarding -H and -B. I use CMake version 3. If you try only "cmake -H" it prints help, but using "cmake -H.CMake is a cross-platform, open-source tool for defining build processes that run on multiple platforms. This article assumes you're familiar with CMake. CMake has become more and more integrated with Visual Studio over the past few releases.

To see the documentation for your preferred version of Visual Studio, use the Version selector control. It's found at the top of the table of contents on this page. Both Ninja and Visual Studio generators are supported. If you use a Visual Studio generator, it generates a temporary project file and passes it to msbuild.

However, the project is never loaded for IntelliSense or browsing purposes. You can also import an existing CMake cache. For more information, see Cross-platform CMake projects. Visual Studio runs cmake.

Introduction to CMake by Example

In the background, Visual Studio starts to index the source files to enable IntelliSense, browsing information, refactoring, and so on. As you work, Visual Studio monitors changes in the editor and also on disk to keep its index in sync with the sources.

You can open folders containing any number of CMake projects. Visual Studio detects and configures all the "root" CMakeLists.

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You can also view your projects organized logically by targets. Choose Targets view from the dropdown in the Solution Explorer toolbar:. Visual Studio uses a configuration file called CMakeSettings. This file lets you define and store multiple build configurations, and conveniently switch between them in the IDE. A configuration is a Visual Studio construct that encapsulates settings that are specific to a given build type.

The settings are used to configure the default command-line options that Visual Studio passes to cmake. You can also specify additional CMake options here, and define any additional variables you like. All options are written to the CMake cache either as internal or external variables. For more information, see Customize CMake settings. Use the CMakeLists. You can specify source files, find libraries, set compiler and linker options, and specify other build system-related information.

To pass arguments to an executable at debug time, you can use another file called launch. In some scenarios, Visual Studio automatically generates these files.

You can edit them manually, or even create the file yourself. Neither of these are relevant for CMake projects. Your custom or preferred tools have complete control over how CMake configures your project. Then, navigate to an existing CMakeCache. You can add an existing CMake cache to an open project.

It's done the same way you'd add a new configuration. For more information, see our blog post on opening an existing cache in Visual Studio. In the General toolbar, find the Configurations dropdown. It probably shows "xDebug" by default. Select the preferred configuration and press F5or click the Run green triangle button on the toolbar. The project automatically builds first, just like a Visual Studio solution.