From 87282d2583eeb829c0bcacd4566bb0edd22a5e47 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Thu, 8 Jun 2023 11:25:58 +0200
Subject: [PATCH 1/2] [cmake] Fix Doxygen call

ALL in doxygen_add_docs requries CMake 3.12 or newer.
ALL in doxygen_add_docs comes after files or dirs
---
 CMakeLists.txt     | 2 +-
 DOC/CMakeLists.txt | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88aecd6a..1bec77d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Required version
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.12)
 
 # Project Version
 project(SuperLU C)
diff --git a/DOC/CMakeLists.txt b/DOC/CMakeLists.txt
index 8b9e9feb..63f0b63f 100644
--- a/DOC/CMakeLists.txt
+++ b/DOC/CMakeLists.txt
@@ -15,10 +15,10 @@ if(enable_doc)
 endif()
 
 doxygen_add_docs(doc
-                 "${_DEPENDENCY_ALL}"
                  "${CMAKE_CURRENT_SOURCE_DIR}/mainpage.txt"
                  "${CMAKE_CURRENT_SOURCE_DIR}/modules.txt"
                  "${PROJECT_SOURCE_DIR}/EXAMPLE"
                  "${PROJECT_SOURCE_DIR}/SRC"
                  "${PROJECT_SOURCE_DIR}/TESTING"
+                 "${_DEPENDENCY_ALL}"
                  COMMENT "Generate HTML documentation with Doxygen")

From c36a1faf095b75c4ff2f74e3014a35976e48ba30 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Thu, 8 Jun 2023 16:01:29 +0200
Subject: [PATCH 2/2] [cmake] Prevent creation of target doc if Doxygen was not
 found

Calling doxygen_add_docs without Doxygen leads to an fatal error.
---
 DOC/CMakeLists.txt | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/DOC/CMakeLists.txt b/DOC/CMakeLists.txt
index 63f0b63f..70aa0136 100644
--- a/DOC/CMakeLists.txt
+++ b/DOC/CMakeLists.txt
@@ -14,11 +14,15 @@ if(enable_doc)
   set(_DEPENDENCY_ALL "ALL")
 endif()
 
-doxygen_add_docs(doc
-                 "${CMAKE_CURRENT_SOURCE_DIR}/mainpage.txt"
-                 "${CMAKE_CURRENT_SOURCE_DIR}/modules.txt"
-                 "${PROJECT_SOURCE_DIR}/EXAMPLE"
-                 "${PROJECT_SOURCE_DIR}/SRC"
-                 "${PROJECT_SOURCE_DIR}/TESTING"
-                 "${_DEPENDENCY_ALL}"
-                 COMMENT "Generate HTML documentation with Doxygen")
+if(DOXYGEN_FOUND)
+  doxygen_add_docs(doc
+                  "${CMAKE_CURRENT_SOURCE_DIR}/mainpage.txt"
+                  "${CMAKE_CURRENT_SOURCE_DIR}/modules.txt"
+                  "${PROJECT_SOURCE_DIR}/EXAMPLE"
+                  "${PROJECT_SOURCE_DIR}/SRC"
+                  "${PROJECT_SOURCE_DIR}/TESTING"
+                  "${_DEPENDENCY_ALL}"
+                  COMMENT "Generate HTML documentation with Doxygen")
+elseif(enable_doc)
+  message(WARNING "Disabling building documentation as Doxygen is missing.")
+endif()