From e78ed6e7f3d64f06761446d0a8dcb356a0373bff Mon Sep 17 00:00:00 2001
From: Hans Johnson <hans.j.johnson@gmail.com>
Date: Sun, 17 Nov 2019 15:14:25 -0600
Subject: COMP: Simplify install commands for Eigen

Confirm that install directory is identical
before and after this simplifying patch.

```bash
hg clone <<Eigen>>
mkdir eigen-bld
cd eigen-bld
cmake ../Eigen -DCMAKE_INSTALL_PREFIX:PATH=/tmp/bef
make install
find /tmp/pre_eigen_modernize >/tmp/bef

#  Apply this patch

cmake ../Eigen -DCMAKE_INSTALL_PREFIX:PATH=/tmp/aft
make install
find /tmp/post_eigen_modernize |sed 's/post_e/pre_e/g' >/tmp/aft
diff /tmp/bef /tmp/aft
```
---
 CMakeLists.txt       |  2 +-
 Eigen/CMakeLists.txt | 19 -------------------
 2 files changed, 1 insertion(+), 20 deletions(-)
 delete mode 100644 Eigen/CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c178ce56..619bd18f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -456,7 +456,7 @@ if(EIGEN_BUILD_PKGCONFIG)
         )
 endif()
 
-add_subdirectory(Eigen)
+install(DIRECTORY Eigen DESTINATION ${INCLUDE_INSTALL_DIR} COMPONENT Devel)
 
 add_subdirectory(doc EXCLUDE_FROM_ALL)
 
diff --git a/Eigen/CMakeLists.txt b/Eigen/CMakeLists.txt
deleted file mode 100644
index 8236684a2..000000000
--- a/Eigen/CMakeLists.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-include(RegexUtils)
-test_escape_string_as_regex()
-
-file(GLOB Eigen_directory_files "*")
-
-escape_string_as_regex(ESCAPED_CMAKE_CURRENT_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
-
-foreach(f ${Eigen_directory_files})
-  if(NOT f MATCHES "\\.txt" AND NOT f MATCHES "${ESCAPED_CMAKE_CURRENT_SOURCE_DIR}/[.].+" AND NOT f MATCHES "${ESCAPED_CMAKE_CURRENT_SOURCE_DIR}/src")
-    list(APPEND Eigen_directory_files_to_install ${f})
-  endif()
-endforeach()
-
-install(FILES
-  ${Eigen_directory_files_to_install}
-  DESTINATION ${INCLUDE_INSTALL_DIR}/Eigen COMPONENT Devel
-  )
-
-install(DIRECTORY src DESTINATION ${INCLUDE_INSTALL_DIR}/Eigen COMPONENT Devel FILES_MATCHING PATTERN "*.h")
-- 
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