From 9842366bba5eddaf847a265a1710b694211e6258 Mon Sep 17 00:00:00 2001
From: Bowie Owens <bowie.owens@csiro.au>
Date: Wed, 18 Nov 2020 10:08:23 +1100
Subject: Make inclusion of doc sub-directory optional by adjusting options.

Allows exclusion of doc and related targets to help when using eigen via add_subdirectory().

Requested by:

https://gitlab.com/libeigen/eigen/-/issues/1842

Also required making EIGEN_TEST_BUILD_DOCUMENTATION a dependent option on EIGEN_BUILD_DOC. This ensures documentation targets are properly defined when EIGEN_TEST_BUILD_DOCUMENTATION is ON.
---
 CMakeLists.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1340b04f3..86bf5f64c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -470,7 +470,12 @@ endif()
 
 install(DIRECTORY Eigen DESTINATION ${INCLUDE_INSTALL_DIR} COMPONENT Devel)
 
-add_subdirectory(doc EXCLUDE_FROM_ALL)
+
+option(EIGEN_BUILD_DOC "Enable creation of Eigen documentation" ON)
+if(EIGEN_BUILD_DOC)
+  add_subdirectory(doc EXCLUDE_FROM_ALL)
+endif()
+
 
 option(BUILD_TESTING "Enable creation of Eigen tests." ON)
 if(BUILD_TESTING)
-- 
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