Meta: Use add_serenity_directory for LibTimeZone

This lets us eliminate the "meta prefix" for the LibTimeZone generators.

Meta/CMake/time_zone_data.cmake

@@ -68,30 +68,18 @@ if (ENABLE_TIME_ZONE_DATABASE_DOWNLOAD)
     extract_tzdb_file("${TZDB_SOUTH_AMERICA_SOURCE}" "${TZDB_SOUTH_AMERICA_PATH}")
     extract_tzdb_file("${TZDB_ZONE_1970_SOURCE}" "${TZDB_ZONE_1970_PATH}")
 
-    set(TIME_ZONE_DATA_HEADER LibTimeZone/TimeZoneData.h)
-    set(TIME_ZONE_DATA_IMPLEMENTATION LibTimeZone/TimeZoneData.cpp)
-
-    set(TIME_ZONE_META_TARGET_PREFIX LibTimeZone_)
-
-    if (CMAKE_CURRENT_BINARY_DIR MATCHES ".*/LibTimeZone") # Serenity build.
-        set(TIME_ZONE_DATA_HEADER TimeZoneData.h)
-        set(TIME_ZONE_DATA_IMPLEMENTATION TimeZoneData.cpp)
-
-        set(TIME_ZONE_META_TARGET_PREFIX "")
-    endif()
-
     invoke_generator(
         "TimeZoneData"
         Lagom::GenerateTimeZoneData
         "${TZDB_VERSION_FILE}"
-        "${TIME_ZONE_META_TARGET_PREFIX}"
-        "${TIME_ZONE_DATA_HEADER}"
-        "${TIME_ZONE_DATA_IMPLEMENTATION}"
+        ""
+        "TimeZoneData.h"
+        "TimeZoneData.cpp"
         arguments -z "${TZDB_ZONE_1970_PATH}" "${TZDB_AFRICA_PATH}" "${TZDB_ANTARCTICA_PATH}" "${TZDB_ASIA_PATH}" "${TZDB_AUSTRALASIA_PATH}" "${TZDB_BACKWARD_PATH}" "${TZDB_ETCETERA_PATH}" "${TZDB_EUROPE_PATH}" "${TZDB_NORTH_AMERICA_PATH}" "${TZDB_SOUTH_AMERICA_PATH}"
     )
 
     set(TIME_ZONE_DATA_SOURCES
-        ${TIME_ZONE_DATA_HEADER}
-        ${TIME_ZONE_DATA_IMPLEMENTATION}
+        "TimeZoneData.h"
+        "TimeZoneData.cpp"
     )
 endif()

Meta/Lagom/CMakeLists.txt

@@ -143,6 +143,7 @@ include_directories(../../Userland/Services)
 include_directories(${CMAKE_BINARY_DIR})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${CMAKE_BINARY_DIR}/Libraries)
+include_directories(${CMAKE_BINARY_DIR}/Userland/Libraries)
 include_directories(${CMAKE_BINARY_DIR}/Services)
 
 # install rules, think about moving to its own helper cmake file
@@ -298,12 +299,9 @@ add_serenity_subdirectory(Userland/Libraries/LibMain)
 
 # LibTimeZone
 # This is needed even if Lagom is not enabled because it is depended upon by code generators.
-include(time_zone_data)
-file(GLOB LIBTIMEZONE_SOURCES CONFIGURE_DEPENDS "../../Userland/Libraries/LibTimeZone/*.cpp")
-lagom_lib(TimeZone timezone
-    SOURCES ${LIBTIMEZONE_SOURCES} ${TIME_ZONE_DATA_SOURCES}
-)
-target_compile_definitions(LibTimeZone PRIVATE ENABLE_TIME_ZONE_DATA=$<BOOL:${ENABLE_TIME_ZONE_DATABASE_DOWNLOAD}>)
+add_serenity_subdirectory(Userland/Libraries/LibTimeZone)
+# We need an install rule for LibTimeZone b/c it is a manual OBJECT library instead of serenity_lib
+install(TARGETS LibTimeZone EXPORT LagomTargets)
 
 # LibIDL
 # This is used by the BindingsGenerator so needs to always be built.