CMake linux: copy LD_PRELOAD script

Copy package/linux/dfhack to the games directory; it's the same as the
normal df script, but sets LD_PRELOAD properly.

Also, CMAkeLists.txt now checks to see that the output directory is set
to the game directory, and fatally fails if it isn't.

CMakeLists.txt

@@ -28,6 +28,14 @@ ENDIF()
 SET(DFHACK_OUTPUT_DIR "${dfhack_BINARY_DIR}/bin" CACHE STRING "Where should be the produced libraries and binaries stored.")
 SET(DFHACK_PLUGIN_OUTPUT_DIR "${DFHACK_OUTPUT_DIR}/plugins")
 
+IF(UNIX)
+    # Make sure output directory is properly set
+    IF (NOT EXISTS "${DFHACK_OUTPUT_DIR}/df" OR
+            NOT EXISTS "${DFHACK_OUTPUT_DIR}/libs/Dwarf_Fortress")
+       message(FATAL_ERROR "DFHACK_OUTPUT_DIR must be directory containg game")
+    ENDIF()
+ENDIF()
+
 ## where to put things during the build (force MSVC to behave)
 SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${DFHACK_OUTPUT_DIR})
 SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${DFHACK_OUTPUT_DIR})

library/CMakeLists.txt

@@ -144,6 +144,15 @@ COMMAND ${CMAKE_COMMAND} -E make_directory ${DFHACK_PLUGIN_OUTPUT_DIR}
 COMMAND ${CMAKE_COMMAND} -E copy ${dfhack_SOURCE_DIR}/Memory.xml ${DFHACK_OUTPUT_DIR})
 ADD_DEPENDENCIES(dfhack prepare)
 
+# Copy our version of the df launch script which sets LD_PRELOAD
+IF(UNIX)
+    ADD_CUSTOM_TARGET( prepare_UNIX
+    DEPENDS ${dfhack_SOURCE_DIR}/package/linux/dfhack
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${DFHACK_OUTPUT_DIR}
+    COMMAND ${CMAKE_COMMAND} -E copy ${dfhack_SOURCE_DIR}/package/linux/dfhack ${DFHACK_OUTPUT_DIR})
+    ADD_DEPENDENCIES(dfhack prepare_UNIX)
+ENDIF()
+ 
 install(TARGETS dfhack
         LIBRARY DESTINATION ${DFHACK_LIBRARY_DESTINATION}
         RUNTIME DESTINATION ${DFHACK_LIBRARY_DESTINATION}) #linux: lib

package/linux/dfhack

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# NOTE: This is dfhack's modification of the normal invocation script,
+# changed to properly set LD_PRELOAD so as to run DFHACK.
+
+DF_DIR=$(dirname "$0")
+cd "${DF_DIR}"
+export SDL_DISABLE_LOCK_KEYS=1 # Work around for bug in Debian/Ubuntu SDL patch.
+#export SDL_VIDEO_CENTERED=1 # Centre the screen.  Messes up resizing.
+
+export LD_PRELOAD=./libdfhack.so
+
+./libs/Dwarf_Fortress $* # Go, go, go! :)