![]() Our solution involved treating the xmls and the generator as code that needs to compile, treating the generator as a dependency and the xml files as source. I don't know cmake, but this might give you several ideas: Only we don't work with cmake but another build system. If you do not know the name of the files, you can use ADD_CUSTOM_COMMAND( OUTPUT generated.timestampĬOMMAND $" COPY_ONLY )įILE( GLOB GENERATED_SOURCES. The custom command will take care of regeneration IF required. ![]() However, since it does nothing (besides printing the comment and checking the dependencies) in this case, that doesn't matter. NB: The RunGenerator target will always be considered out-of-date and, thus, always run. Then make your other targets depend on this one: ADD_DEPENDENCIES( MyTarget RunGenerator ) To ensure this, the following should do the trick: ADD_CUSTOM_TARGET( RunGenerator DEPENDS generatedfile1 generatedfile2ĬOMMENT "Checking if re-generation is required" ) Make sure that the generated files are not used in more than one independent target that may compile in parallel or you may(will) get a conflict during your build. ADD_CUSTOM_COMMAND( OUTPUT generatedfile1 generatedfile2ĬOMMAND python generateSources.py xmlfile1 xmlfile2ĭEPENDS xmlfile1 xmlfile2 generateSources.pyĬOMMENT "Generating source code from XML" ) It allows you to define input and output dependencies and will only run if the outputs are older than the inputs. Use ADD_CUSTOM_COMMAND to trigger your generator. My code generator will generate a variable number of files. But this relies on the output of the code generator being known in advance. What is the proper way to handle such a situation in cmake? I have seen this previous answer: " Get CMake to execute a target in project before building a library". In other words, I want the libraries to depend on the generator to have run. I also want to make sure that the generated code is always run before my libraries. However, this runs every time I run cmake and it touches the files, causing my generated code to be recompiled and adding to my total compile time. At the moment, I am using execute_process to fire off the generator. I want to use cmake to manage the build process. The input (an XML file) to the generator changes.I know that the generated code will only change if one of two conditions are true: This code is subsequently compiled and linked to my libraries and executables. ** According to the documentation for CMake Version 3.9 & 3.15 & 3.I am working on a source code repository that generates some C++ code by running a python script outputting headers and implementation. Also as mentioned above, there are configuration files that must be generated that depend on the source files supplied in the CMakeLists.txt file. Some source files may already exist, but CMake has the ability to generate header and source files. Why do the input files have to be written by the generator if they already exist? ![]() Generally, yes, but other build systems could be setup like Ninja. If I'm using Linux, what is my native build system by default? Make? With both systems there are additional files needed that CMake knows how to create given a proper CMakeLists.txt file. For Visual Studio you have a solution file (.sln). For a make build system you also have a MakeFile. If I have a set of C++ files in my project, are these the input files? These are generators that create a configuration to work with an alternative IDE tool and must be included with either an IDE or Command-Line generator. Examples are Visual Studio and Xcode which include a compiler natively. These generators are for Integrated Development Environments that include their own compiler. The chosen tool chain must be configured prior to generating the build system with CMake. These generators are for command-line build tools, like Make and Ninja. CMake allows you to specify which if these build systems to generate configuration files for.ĬMake includes a number of Command-Line, IDE, and Extra generators. Sometimes multiple build systems may be installed on a computer, like for Windows you could have a Visual Studio and MinGW build system. The build system uses those files to compile and link source code files.Ī build system is a broad term that groups together a set of tools used to generally compile and link source code, but it can also include auxiliary tools used during a build process.įor example, in a multi-stage build system, one executable might be built to be used in the build process of another build.ĭepending on the tool chain used on a system, CMake will generate multiple files and folders to allow the building of the source files referenced in the CMakeLists.txt and supporting. It used a generator to create configuration files for a build system. CMake doesn't compile or link any source files. To understand what a generator is, we need to first look at what is a build system. ![]()
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