-
Christian Heimlich authored
The foundation of the Doxygen Find Module's detection methodology is the command `find_program`, which has inhibited the module from properly handling user version restrictions when provided. Because `find_program` historically has always returned after the first match and does not consider version constraints, users of this module are inadvertently at the mercy of the command's search procedure. Essentially, `find_package(Doxygen ...)` will always provide the first Doxygen build found through said procedure, even if it conflicts with the user's version requirements, and even if another build exists on the system that would satisfy those requirements (i.e. shadowing). Utilizes the new `VALIDATOR` option of `find_program` to ensure all otherwise detectable builds of Doxygen on a given system are evaluated and that only a build in compliance with `Doxygen_FIND_VERSION` et. al., when defined, will be matched against. Also enables handling of version ranges specified within `find_package` via the **FindPackageHandleStandardArgs** module. Finally, ensures that only the major, minor, and patch components of Doxygen's `--version` output are captured for comparison in cases where it contains additional information, such as a git commit hash. Fixes: #23692
eaec9cf6