Question 1

How to implement unity builds with ucm in CMake?

Accepted Answer

Use the ucm_add_target macro with the UNITY flag, specify CPP_PER_UNITY for file grouping, and exclude problematic sources with UNITY_EXCLUDED. This automates unity file generation while maintaining original targets for IDE browsing.

Question 2

ucm vs standard CMake for managing compiler flags?

Accepted Answer

ucm simplifies flag management with macros that handle configurations and compilers in one line, but it abstracts CMake's native set_property commands, which might be preferred for transparency and control in modern CMake practices.

Question 3

Does ucm work with the latest versions of CMake and IDEs?

Accepted Answer

ucm is tested with MSVC, GCC, and Clang but doesn't specify CMake or IDE versions; it likely works with recent ones, but users should verify compatibility for features like Xcode attribute settings or Visual Studio filters.

Question 4

How to exclude specific files from source collection in ucm?

Accepted Answer

After adding sources with ucm_add_dirs, use ucm_remove_files or ucm_remove_directories with MATCHES patterns to filter out unwanted files or directories, as shown in the README examples for dynamic source management.

Question 5

ucm or cotire for precompiled headers in C++ projects?

Accepted Answer

ucm integrates cotire for precompiled headers, so if you need additional features like unity builds or flag management, ucm is better; for standalone PCH without extra macros, cotire alone might be simpler.

Question 6

Setting up ucm in an existing CMake project?

Accepted Answer

Clone ucm as a submodule or copy the macros, include it in your CMakeLists.txt, and initialize cotire if using PCH. Start by replacing add_library/add_executable with ucm_add_target and using ucm_add_flags for gradual integration.

ucm

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