#Cmake include all but code
For example, compiling the code in the source file program.cpp that includes the header files first_dir/first_include.h and second_dir/second_include.h needs the following command. Telling the compiler where your include files are isn’t too difficult. So how do we tell CMake the location of our include files? CMake Makes Working With The Compilers Easier
#Cmake include all but how to
However, the compiler needs to know how to find the file. Essentially, whatever file we include in that statement gets copied and pasted into the current source file by the compiler.
With CMake, adding header include directories to your C++ project is as easy as using your head in football! Heading those C++ include directories is easy with CMake.Īs you are probably aware, you can include other source files in C++ with the #include pre-processor directive. In C++, this can be achieved by having multiple header and source files for different components. You can add more niceties to the above, such as making CMake GUI aware of the supported choices so that it presents a combobox to the user instead of an arbitrary text entry field.A good coding practice is splitting up your code into different reasonable and relatable pieces of code. Message(FATAL_ERROR "$ is not a supported implementation.") If(MYPROJ_FEATUREIMPL STREQUAL SLOW_BUT_SAFE)Įlseif(MYPROJ_FEATUREIMPL STREQUAL SCARY_FAST) set(MYPROJ_FEATUREIMPL SLOW_BUT_SAFE CACHE STRING "Helpful doc string here") This would be suitable where exactly one choice from a limited set of choices has to be made. Target_link_library(someotherthing PRIVATE somefeature)Īnother variation is to choose between a set of implementations (kinda of like an enum in C++). Eg option(MYPROJ_ENABLE_SOMEFEATURE "Helpful doc string here" ON) # See belowĪdd_library(somefeature src1.cpp src2.cpp)
If you need to keep things in the same directory, just put the feature-specific bits directly in the if() block. It doesn’t have to be that way, but it is often clearer and easier to work with and maintain like that. The above also assumes your project is nicely structured such that this optional part of the project is self-contained in a subdirectory. For example, you may check if certain required dependencies are available. In your project, you may want to do some logic before that to work out whether you want the default to be ON or OFF. If I left that out, the default would be OFF. In the above, I’ve explicitly specified the default value for the switch to be ON. Don’t try to have incomplete information in the things that CMake sees and then try to avoid problems by just not building the incomplete targets.Ī typical arrangement I would use for this sort of scenario might look something like this: option(MYPROJ_ENABLE_SOMEFEATURE "Helpful doc string here" ON) # See below Use CMake cache variables to enable/disable parts of the project. On the other hand, I would have thought that there would be a cmake directive to force it to exclude any unresolved/unused libraries.
#Cmake include all but series
For small projects that may be workable, but for large projects that either means massive cmake files or a series of dummy directories to hold the various cmake files. If that’s the way that cmake works then I guess we can look at changing it, but to me that’s a failing of cmake in that your project can only include paths to cmake files that you are interested in and that those directories have to be unique to your project. Instead, we have a cmake file in dirCommon that defines the files/options to use for each of the two variants. What you are saying is that in a library codespace where you have dirCommon, dirCodecA and dirCodecB you should setup your cmake files to have one in dirCodecA and one in dirCodecB (that both include what they need from dirCommon). I guess it’s just a side effect of how the cmake files were created in this instance.
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