[cmake] Disable finding Doxygen only for CMake < 3.28

The allows building the documentation without setting a flag only by running "make doc" / "ninja doc".
gruenich · Sep 29, 2024 · 7c63fbf · 7c63fbf
1 parent 7c80e81
commit 7c63fbf
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -262,6 +262,8 @@ endif()
 
 add_subdirectory(EXAMPLE)
 
-if (enable_doc)
+# To work around CMake bug #18708 that got fixed in 3.28.0, for
+# older CMake disable finding Doxygen unless explicitly enabled
+if (enable_doc OR (CMAKE_VERSION VERSION_GREATER_EQUAL "3.28.0"))
    add_subdirectory(DOC)
 endif()