More cmake updates

Uses system libraries by default with a fallback to local
Adds the Wrapper build on OSX
Adds mod_script_pipe
Adds ffmpeg
Some additional cleanup

cmake-proxies/ffmpeg/CMakeLists.txt

@@ -1,19 +1,54 @@
-#directory cmake-proxies/expat
-set( TARGET expat )
-set( TARGET_SOURCE ${LIB_SRC_DIRECTORY}${TARGET} )
-project( ${TARGET} )
 
-set( SOURCES 
-${TARGET_SOURCE}/lib/xmlparse.c
-#${LIB_SRC_DIRECTORY}FileDialog/gtk/FileDialogPrivate.cpp #not on windows.
-#${LIB_SRC_DIRECTORY}${TARGET}/win/FileDialogPrivate.cpp
-)
-# This defines the #define on both Windows and Linux.
-add_definitions(  )
-add_library( ${TARGET} MODULE ${SOURCES})
+# Add our target and all of it's aliases
+add_library( ${TARGET} INTERFACE )
+add_library( libavcodec ALIAS ${TARGET} )
+add_library( libavformat ALIAS ${TARGET} )
+add_library( libavutil ALIAS ${TARGET} )
 
-target_include_directories( ${TARGET} PRIVATE 
+# Pull in standard variables
+def_vars()
 
-)
+message( STATUS "========== Configuring ${TARGET} ==========" )
+
+# Let the Audacity target know we're using ffmpeg
+set( USE_FFMPEG ON CACHE INTERNAL USE_FFMPEG )
+
+# Add the system/local option
+option( use_system_${TARGET} "Use ${TARGET} system library if available" ${prefer_system_libs} )
+
+# Look up the system packages if the user wants them
+if( use_system_${TARGET} )
+   # Provide an option that determines if the libraries are loaded
+   # dynamically at run time or statically link to at build time
+   option( disable_dynamic_loading "Disable dynamic loading of ${TARGET} libraries" NO)
+
+   # Look them up
+   pkg_check_modules( ${TARGET} ${packages} )
+else()
+   # Make sure to reset in case user reconfigures between local/system
+   set( disable_dynamic_loading NO CACHE INTERNAL "" )
+endif()
+
+# If the system packages were found
+if( ${TARGET}_FOUND )
+   message( STATUS "Using '${TARGET}' system library" )
+
+   # Pull in the package settings
+   get_package_interface( ${TARGET} )
+else()
+   message( STATUS "Using '${TARGET}' local library" )
+
+   # Otherwise define the local settings
+   list( APPEND INCLUDES
+      INTERFACE
+         ${TARGET_ROOT}
+   )
+endif()
+
+# And add the settings to the target
+target_include_directories( ${TARGET} INTERFACE ${INCLUDES} )
+target_compile_options( ${TARGET} INTERFACE ${CFLAGS} )
+target_link_directories( ${TARGET} INTERFACE ${LINKDIRS} )
+target_link_options( ${TARGET} INTERFACE ${LDFLAGS} )
+target_link_libraries( ${TARGET} INTERFACE ${LIBRARIES} )
 
-target_link_libraries( ${TARGET} )