This command specifies compiler options to use when compiling a given target. These options are added to the compile line after options added by `CMAKE_CXX_FLAGS` or `CMAKE_C_FLAGS` variable or the corresponding target properties. For example, `target_compile_options(my_target PRIVATE /WX)` would add the `/WX` flag, enabling warnings as errors, specifically for the compilation of `my_target`. Options can be specified as `PRIVATE`, `PUBLIC`, or `INTERFACE` to control how they propagate to dependent targets.
Specifying compiler flags on a per-target basis offers significant advantages over globally modifying flags. This granular control allows developers to fine-tune compilation settings for individual components, ensuring optimal code generation and behavior without unintended side effects on other parts of the project. This practice becomes particularly crucial in large projects with diverse codebases and dependencies. Historically, managing compiler flags was often done globally, leading to potential conflicts and difficult-to-maintain build configurations. The introduction of per-target control marked a significant improvement in CMake’s ability to handle complex project structures and promote more robust builds.
