From 7847c7fa68f47c78ccabcabfa3d7527362b12874 Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Fri, 13 Dec 2024 18:21:21 +0100
Subject: [PATCH 1/2] doxygen: install in CMAKE_INSTALL_FULL_DOCDIR

---
 doxygen.cmake | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/doxygen.cmake b/doxygen.cmake
index 79f968b2c..f7684aea6 100644
--- a/doxygen.cmake
+++ b/doxygen.cmake
@@ -628,18 +628,18 @@ macro(_SETUP_PROJECT_DOCUMENTATION)
       if(EXISTS ${PROJECT_BINARY_DIR}/doc/${PROJECT_NAME}.doxytag)
         install(
           FILES ${PROJECT_BINARY_DIR}/doc/${PROJECT_NAME}.doxytag
-          DESTINATION ${CMAKE_INSTALL_DOCDIR}/doxygen-html
+          DESTINATION ${CMAKE_INSTALL_FULL_DOCDIR}/doxygen-html
         )
       endif()
       install(
         DIRECTORY ${PROJECT_BINARY_DIR}/doc/doxygen-html
-        DESTINATION ${CMAKE_INSTALL_DOCDIR}
+        DESTINATION ${CMAKE_INSTALL_FULL_DOCDIR}
       )
 
       if(EXISTS ${PROJECT_SOURCE_DIR}/doc/pictures)
         install(
           DIRECTORY ${PROJECT_SOURCE_DIR}/doc/pictures
-          DESTINATION ${CMAKE_INSTALL_DOCDIR}/doxygen-html
+          DESTINATION ${CMAKE_INSTALL_FULL_DOCDIR}/doxygen-html
         )
       endif(EXISTS ${PROJECT_SOURCE_DIR}/doc/pictures)
     endif(INSTALL_DOCUMENTATION)
@@ -738,7 +738,6 @@ macro(_SETUP_PROJECT_DOCUMENTATION_FINALIZE)
     if(INSTALL_DOCUMENTATION)
       # Find doxytag files To ignore this list of tag files, set variable
       # DOXYGEN_TAGFILES
-      set(INSTALL_DOCDIR ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DOCDIR})
       set(PKG_REQUIRES ${_PKG_CONFIG_REQUIRES})
       list(APPEND PKG_REQUIRES ${_PKG_CONFIG_COMPILE_TIME_REQUIRES})
       foreach(PKG_CONFIG_STRING ${PKG_REQUIRES})
@@ -753,7 +752,7 @@ macro(_SETUP_PROJECT_DOCUMENTATION_FINALIZE)
           file(
             RELATIVE_PATH
             DEP_DOCDIR
-            ${INSTALL_DOCDIR}
+            ${CMAKE_INSTALL_FULL_DOCDIR}
             ${${PREFIX}_DOXYGENDOCDIR}
           )
 

From be1630a374ce4fe09aff3d7b90a2e7983fe08acf Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Sun, 15 Dec 2024 16:37:51 +0100
Subject: [PATCH 2/2] doxygen: allow manual specification of some tagfiles

This is especially useful for eigen
---
 doxygen.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doxygen.cmake b/doxygen.cmake
index f7684aea6..a55122bec 100644
--- a/doxygen.cmake
+++ b/doxygen.cmake
@@ -706,6 +706,9 @@ endmacro()
 # Doxyfile.extra and Doxyfile files are generated at the end to allow the
 # replacement of user-defined variables.
 #
+# Additional doxygen tagfiles from dependencies can be added to
+# `DOXYGEN_TAGFILES_FROM_DEPENDENCIES`
+#
 macro(_SETUP_PROJECT_DOCUMENTATION_FINALIZE)
   if(DOXYGEN_FOUND)
     if(NOT "${DOXYGEN_USE_MATHJAX}" STREQUAL "YES")
@@ -738,6 +741,7 @@ macro(_SETUP_PROJECT_DOCUMENTATION_FINALIZE)
     if(INSTALL_DOCUMENTATION)
       # Find doxytag files To ignore this list of tag files, set variable
       # DOXYGEN_TAGFILES
+      set(_TAGFILES_FROM_DEPENDENCIES "${DOXYGEN_TAGFILES_FROM_DEPENDENCIES}")
       set(PKG_REQUIRES ${_PKG_CONFIG_REQUIRES})
       list(APPEND PKG_REQUIRES ${_PKG_CONFIG_COMPILE_TIME_REQUIRES})
       foreach(PKG_CONFIG_STRING ${PKG_REQUIRES})