From 75cd4712543050f7b772867bb5b90862bfd29b4f Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 28 Jan 2009 09:42:21 +0000
Subject: [PATCH] From Mattias Helsing, "this is a semi-submission based on
 what you and others have been talking about in the LIB_POSTFIX thread. It is
 a bit verbose perhaps and the message I emit during the make install step
 flashes by and gets burried under all "installing..." and/or "up-to-date..."
 messages. I have posted on the cmake mail list on ways to do this better.

The submission adds:
* message to user during configuration that s/he's eventually going o
install to ${CMAKE_INSTALL_PREFIX}lib${LIB_POSTFIX}
* if system has /etc/ld.so.conf.d and it is a dir generates
packaging/ld.so.conf.d/openscenegraph.conf and creates a custom target
for installing it (target must be run explicitly of course). User is
notified of this during configuration (may not be necessary)
* emit a message during installation that libraries are put in
<same-as-above>. This message unfortunately gets emitted to soon for
the user to see it

* I added "COMPONENT libopenscenegraph-dev" to the pkgconfig.pc's
install command
* Moved the section with OSG_CONFIG_HAS_BEEN_RUN_BEFORE as close to
the end of CMakeLists.txt as I dared. This is the intent of this
construct I think."
---
 CMakeLists.txt                                | 45 ++++++++++++++++---
 packaging/ld.so.conf.d/openscenegraph.conf.in |  2 +
 2 files changed, 40 insertions(+), 7 deletions(-)
 create mode 100644 packaging/ld.so.conf.d/openscenegraph.conf.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06d6102e8..16afd2cbd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -736,12 +736,6 @@ IF(BUILD_DASHBOARD_REPORTS)
     INCLUDE(Dart)
 ENDIF(BUILD_DASHBOARD_REPORTS)
 
-# This needs to be run very last so other parts of the scripts can take
-# advantage of this.
-IF(NOT OSG_CONFIG_HAS_BEEN_RUN_BEFORE)
-    SET(OSG_CONFIG_HAS_BEEN_RUN_BEFORE 1 CACHE INTERNAL "Flag to track whether this is the first time running CMake or if CMake has been configured before")
-ENDIF(NOT OSG_CONFIG_HAS_BEEN_RUN_BEFORE)
-
 # present the packaging option only if we have the cpack command defined (effectively >= 2.6.0)
 IF(CMAKE_CPACK_COMMAND)
     OPTION(BUILD_OSG_PACKAGES "Set to ON to generate CPack configuration files and packaging targets" OFF)
@@ -757,7 +751,44 @@ CONFIGURE_FILE(${PROJECT_SOURCE_DIR}/packaging/pkgconfig/openscenegraph.pc.in
     @ONLY
     )
 
-INSTALL(FILES ${PROJECT_BINARY_DIR}/packaging/pkgconfig/openscenegraph.pc DESTINATION lib${LIB_POSTFIX}/pkgconfig)
+INSTALL(FILES ${PROJECT_BINARY_DIR}/packaging/pkgconfig/openscenegraph.pc DESTINATION lib${LIB_POSTFIX}/pkgconfig COMPONENT libopenscenegraph-dev)
+
+# Run this as late as possible so users can easier spot the message
+IF(LIB_POSTFIX)
+    MESSAGE("You will be installing libraries to ${CMAKE_INSTALL_PREFIX}lib${LIB_POSTFIX}\n"
+        "Your loader may not be able to find your installed libraries unless you:\n"
+        "  set your LD_LIBRARY_PATH (user specific)\n"
+        "  update your ld.so configuration (system wide)")
+    IF(IS_DIRECTORY /etc/ld.so.conf.d)
+        MESSAGE("You have an ld.so.conf.d directory on your system.\n"
+            "You can install a openscenegraph specific ld.so configuration with:\n"
+            "  sudo make install_ld_conf")
+        CONFIGURE_FILE(${PROJECT_SOURCE_DIR}/packaging/ld.so.conf.d/openscenegraph.conf.in
+            ${PROJECT_BINARY_DIR}/packaging/ld.so.conf.d/openscenegraph.conf
+        )
+        ADD_CUSTOM_TARGET(install_ld_conf ${CMAKE_COMMAND} -E copy_if_different 
+            ${PROJECT_BINARY_DIR}/packaging/ld.so.conf.d/openscenegraph.conf
+            /etc/ld.so.conf.d/openscenegraph.conf
+            COMMAND ldconfig
+            COMMENT "Copying openscenegraph.conf to /etc/ld.so.conf.d and running ldconfig"
+        )
+    ELSE(IS_DIRECTORY /etc/ld.so.conf.d)
+        IF(EXIST /etc/ld.so.conf)
+            MESSAGE("You have an ld.so.conf file in /etc\n"
+                "You may need to add ${CMAKE_INSTALL_PREFIX}lib${LIB_POSTFIX} to it.")
+        ENDIF(EXIST /etc/ld.so.conf)
+    ENDIF(IS_DIRECTORY /etc/ld.so.conf.d)
+
+    # emit a message during installation.
+    INSTALL(CODE "MESSAGE(\"Libraries were installed to ${CMAKE_INSTALL_PREFIX}lib${LIB_POSTFIX}.\\nYou may need to update your ld.so configuration. \")")
+ENDIF(LIB_POSTFIX)
+
+
+# This needs to be run very last so other parts of the scripts can take
+# advantage of this.
+IF(NOT OSG_CONFIG_HAS_BEEN_RUN_BEFORE)
+    SET(OSG_CONFIG_HAS_BEEN_RUN_BEFORE 1 CACHE INTERNAL "Flag to track whether this is the first time running CMake or if CMake has been configured before")
+ENDIF(NOT OSG_CONFIG_HAS_BEEN_RUN_BEFORE)
 
 #-----------------------------------------------------------------------------
 ### uninstall target
diff --git a/packaging/ld.so.conf.d/openscenegraph.conf.in b/packaging/ld.so.conf.d/openscenegraph.conf.in
new file mode 100644
index 000000000..78c3b6914
--- /dev/null
+++ b/packaging/ld.so.conf.d/openscenegraph.conf.in
@@ -0,0 +1,2 @@
+# openscenegraph library configuration
+${CMAKE_INSTALL_PREFIX}lib${LIB_POSTFIX}