From 032cd7b409082fde0b148ba251686427d32f8fd2 Mon Sep 17 00:00:00 2001
From: Denis Davydov <davydden@gmail.com>
Date: Mon, 29 May 2017 11:39:08 +0200
Subject: [PATCH] add deal.IIFeatureConfig.cmake which contains detailed info
 about configured features

---
 cmake/config/CMakeLists.txt                 | 1 +
 cmake/config/Config.cmake.in                | 5 ++++-
 cmake/setup_write_config.cmake              | 9 ++++++++-
 doc/news/changes/minor/20170529DenisDavydov | 7 +++++++
 4 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 doc/news/changes/minor/20170529DenisDavydov

diff --git a/cmake/config/CMakeLists.txt b/cmake/config/CMakeLists.txt
index 1d094e7c34..3169f0edba 100644
--- a/cmake/config/CMakeLists.txt
+++ b/cmake/config/CMakeLists.txt
@@ -159,6 +159,7 @@ CONFIGURE_FILE(
 INSTALL(FILES
   ${CMAKE_CURRENT_BINARY_DIR}/${DEAL_II_PROJECT_CONFIG_NAME}Config.cmake
   ${CMAKE_CURRENT_BINARY_DIR}/${DEAL_II_PROJECT_CONFIG_NAME}ConfigVersion.cmake
+  ${CMAKE_CURRENT_BINARY_DIR}/${DEAL_II_PROJECT_CONFIG_NAME}FeatureConfig.cmake
   DESTINATION ${DEAL_II_PROJECT_CONFIG_RELDIR}
   COMPONENT library
   )
diff --git a/cmake/config/Config.cmake.in b/cmake/config/Config.cmake.in
index 7900b9f630..45a02046ca 100644
--- a/cmake/config/Config.cmake.in
+++ b/cmake/config/Config.cmake.in
@@ -174,7 +174,7 @@ SET(DEAL_II_LIBRARIES "@CONFIG_LIBRARIES@")
 
 
 #
-# Information about library targets
+# Information about library targets and feature configuration
 #
 
 # The library targets file:
@@ -188,3 +188,6 @@ SET(DEAL_II_TARGET_RELEASE "@CONFIG_TARGET_RELEASE@")
 
 # Full list of targets with "debug" and "optimized" keywords for easy use with TARGET_LINK_LIBRARIES:
 SET(DEAL_II_TARGET "@CONFIG_TARGET@")
+
+# The feature configuration file:
+SET(DEAL_II_FEATURE_CONFIG "${DEAL_II_PATH}/${DEAL_II_PROJECT_CONFIG_RELDIR}/${DEAL_II_PROJECT_CONFIG_NAME}FeatureConfig.cmake")
diff --git a/cmake/setup_write_config.cmake b/cmake/setup_write_config.cmake
index daafa3e18b..61c2fe6b66 100644
--- a/cmake/setup_write_config.cmake
+++ b/cmake/setup_write_config.cmake
@@ -41,7 +41,8 @@ FILE(WRITE ${CMAKE_BINARY_DIR}/revision.log
 
 SET(_log_detailed "${CMAKE_BINARY_DIR}/detailed.log")
 SET(_log_summary  "${CMAKE_BINARY_DIR}/summary.log")
-FILE(REMOVE ${_log_detailed} ${_log_summary})
+SET(_log_feature "${CMAKE_BINARY_DIR}/${DEAL_II_PROJECT_CONFIG_RELDIR}/${DEAL_II_PROJECT_CONFIG_NAME}FeatureConfig.cmake")
+FILE(REMOVE ${_log_detailed} ${_log_summary} ${_log_feature})
 
 MACRO(_both)
   # Write to both log files:
@@ -56,6 +57,10 @@ MACRO(_summary)
   # Only write to summary.log:
   FILE(APPEND ${_log_summary} "${ARGN}")
 ENDMACRO()
+MACRO(_featurelog)
+  # Only write to deal.IIFeatureConfig.cmake:
+  FILE(APPEND ${_log_feature} "${ARGN}")
+ENDMACRO()
 
 _both(
 "###
@@ -211,6 +216,7 @@ FOREACH(_feature ${_deal_ii_features_sorted})
     #
     IF(NOT "${${_feature}_DIR}" STREQUAL "")
       _detailed("#            ${_feature}_DIR = ${${_feature}_DIR}\n")
+      _featurelog("SET(DEAL_II_${_feature}_DIR \"${${_feature}_DIR}\")\n")
     ENDIF()
 
     #
@@ -222,6 +228,7 @@ FOREACH(_feature ${_deal_ii_features_sorted})
       )
       IF(DEFINED ${_feature}_${_var2})
         _detailed("#            ${_feature}_${_var2} = ${${_feature}_${_var2}}\n")
+        _featurelog("SET(DEAL_II_${_feature}_${_var2} \"${${_feature}_${_var2}}\")\n")
       ENDIF()
     ENDFOREACH()
   ELSE()
diff --git a/doc/news/changes/minor/20170529DenisDavydov b/doc/news/changes/minor/20170529DenisDavydov
new file mode 100644
index 0000000000..6c719a66ce
--- /dev/null
+++ b/doc/news/changes/minor/20170529DenisDavydov
@@ -0,0 +1,7 @@
+New: deal.IIFeatureConfig.cmake will contain detailed information about
+feature configuration and is installed along with other CMake files.
+These variables can be loaded by calling INCLUDE(${DEAL_II_FEATURE_CONFIG}).
+This is useful when users want to link in additional parts of dependencies, not
+required by deal.II (i.e. filesystem library from Boost package).
+<br>
+(Denis Davydov and Matthias Maier, 2017/05/29)
-- 
2.39.5