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update section on including additional projects

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Lars Melchior 2020-04-20 09:27:59 +02:00
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@ -6,7 +6,7 @@
[![codecov](https://codecov.io/gh/TheLartians/ModernCppStarter/branch/master/graph/badge.svg)](https://codecov.io/gh/TheLartians/ModernCppStarter) [![codecov](https://codecov.io/gh/TheLartians/ModernCppStarter/branch/master/graph/badge.svg)](https://codecov.io/gh/TheLartians/ModernCppStarter)
<p align="center"> <p align="center">
<img src="https://repository-images.githubusercontent.com/254842585/4dfa7580-7ffb-11ea-99d0-46b8fe2f4170" height="175" /> <img src="https://repository-images.githubusercontent.com/254842585/4dfa7580-7ffb-11ea-99d0-46b8fe2f4170" height="175" width="auto" />
</p> </p>
# ModernCppStarter # ModernCppStarter
@ -18,7 +18,7 @@ This template is the result of learnings from many previous projects and should
- [Modern CMake practices](https://pabloariasal.github.io/2018/02/19/its-time-to-do-cmake-right/) - [Modern CMake practices](https://pabloariasal.github.io/2018/02/19/its-time-to-do-cmake-right/)
- Suited for single header libraries and projects of any scale - Suited for single header libraries and projects of any scale
- Separation into library and executable code - Clean separation of library and executable code
- Integrated test suite - Integrated test suite
- Continuous integration via [GitHub Actions](https://help.github.com/en/actions/) - Continuous integration via [GitHub Actions](https://help.github.com/en/actions/)
- Code coverage via [codecov](https://codecov.io) - Code coverage via [codecov](https://codecov.io)
@ -104,11 +104,11 @@ Simply remove the standalone directory and github workflow file.
Glob is considered bad because any changes to the source file structure [might not be automatically caught](https://cmake.org/cmake/help/latest/command/file.html#filesystem) by CMake's builders and you will need to manually invoke CMake on changes. Glob is considered bad because any changes to the source file structure [might not be automatically caught](https://cmake.org/cmake/help/latest/command/file.html#filesystem) by CMake's builders and you will need to manually invoke CMake on changes.
I personally prefer the `GLOB` solution for its simplicity, but feel free to change it to explicitly listing sources. I personally prefer the `GLOB` solution for its simplicity, but feel free to change it to explicitly listing sources.
> I want to add additional targets to my project. Should I modify the main CMakeLists to conditionally include them? > I want create additional targets that depend on my library. Should I modify the main CMakeLists to include them?
If possible, avoid adding conditional includes to the CMakeLists (even though it is a common sight in the C++ world), as it makes the build system convoluted and hard to reason about. Always avoid including derived projects from the from the libraries CMakeLists (even though it is a common sight in the C++ world), as this effectively inverts the dependency tree and makes the build system hard to reason about.
Instead, create a new directory with a CMakeLists that adds the main project as a dependency (e.g. just copy the [standalone](standalone) directory). Instead, create a new directory or project with a CMakeLists that adds the library as a dependency (e.g. like the [standalone](standalone/CMakeLists.txt) directory).
Depending on the complexity of the project it might make sense move the components into separate repositories and use CPM.cmake to add them as dependencies. Depending type it might make sense move these components into a separate repositories and reference a specific commit or version of the library.
This has the advantage that individual libraries and components can be improved and updated independently. This has the advantage that individual libraries and components can be improved and updated independently.
> You recommend to add external dependencies using CPM.cmake. Will this force users of my library to use CPM as well? > You recommend to add external dependencies using CPM.cmake. Will this force users of my library to use CPM as well?