From d5cbc2002bbf75f08036f7adf861b027768a0622 Mon Sep 17 00:00:00 2001
From: Martin Nowack <m.nowack@imperial.ac.uk>
Date: Mon, 6 Apr 2020 14:38:50 +0100
Subject: [cmake] Use clean command to remove generated doxygen files

---
 docs/CMakeLists.txt | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index 6f4168c3..5cab7b4a 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -33,15 +33,14 @@ if (ENABLE_DOXYGEN)
     # doxygen.cfg
     set(DOXYGEN_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/doxygen")
 
-    # Add rule to clean doxygen documentation
-    add_custom_target(clean_doxygen
-      COMMAND
-        "${CMAKE_COMMAND}"
-        "-E"
-        "remove_directory"
-        "${DOXYGEN_OUTPUT_DIR}"
-    )
-    add_dependencies(clean_all clean_doxygen)
+    if ("${CMAKE_VERSION}" VERSION_LESS "3.15")
+      set_directory_properties(PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
+              "${DOXYGEN_OUTPUT_DIR}")
+    else ()
+      set_directory_properties(PROPERTY ADDITIONAL_CLEAN_FILES
+              "${DOXYGEN_OUTPUT_DIR}")
+    endif ()
+
   else()
     message(WARNING "Doxygen not found. Can't build Doxygen documentation")
     set(ENABLE_DOXYGEN OFF
-- 
cgit 1.4.1