CMake: Provide proper interface targets from dependencies

* to make use of cmakes inherited link dependencies which
  imports all include directories/ definitions from the link library

(cherry picked from commit 1a572d242593124f986d3ed08710b96a142a6763)

1 files changed, 38 insertions, 0 deletions

diff --git a/dep/readline/CMakeLists.txt b/dep/readline/CMakeLists.txt
new file mode 100644
index 00000000000..0e8679ba718
--- /dev/null
+++ b/dep/readline/CMakeLists.txt
@@ -0,0 +1,38 @@
+# Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+if( UNIX )
+  # find Readline (terminal input library) includes and library
+  #
+  # READLINE_INCLUDE_DIR - where the directory containing the READLINE headers can be found
+  # READLINE_LIBRARY     - full path to the READLINE library
+  find_path(READLINE_INCLUDE_DIR readline/readline.h)
+  find_library(READLINE_LIBRARY NAMES readline)
+
+  message(STATUS "Found Readline library: ${READLINE_LIBRARY}")
+  message(STATUS "Include dir is: ${READLINE_INCLUDE_DIR}")
+
+  if (NOT READLINE_INCLUDE_DIR OR NOT READLINE_LIBRARY)
+    message(FATAL_ERROR "** Readline library not found!\n** Your distro may provide a binary for Readline e.g. for ubuntu try apt-get install libreadline5-dev")
+  endif ()
+
+  add_library(readline SHARED IMPORTED GLOBAL)
+
+  set_target_properties(readline
+    PROPERTIES
+      IMPORTED_LOCATION
+        "${READLINE_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES
+        "${READLINE_INCLUDE_DIR}")
+
+else()
+  # Provide a dummy target
+  add_library(readline INTERFACE)
+endif()