[CMake] Set correct RPATH for swift-syntax libs in Linux

Author: rintaro

CMakeLists.txt

@@ -1163,6 +1163,9 @@ swift_get_host_triple(SWIFT_HOST_TRIPLE)
 set(SWIFT_HOST_MODULE_TRIPLE "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${SWIFT_HOST_VARIANT_ARCH}_MODULE}")
 set(SWIFT_HOST_LIBRARIES_DEST_DIR "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/swift/host")
 set(SWIFT_HOST_RUNTIME_DEST_DIR "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
+if(SWIFT_HOST_VARIANT_SDK MATCHES "LINUX|ANDROID|OPENBSD|FREEBSD")
+  set(SWIFT_HOST_LIBRARIES_RPATH "$ORIGIN;$ORIGIN/../${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
+endif()
 if(SWIFT_BUILD_SWIFT_SYNTAX)
   if(NOT EXISTS "${SWIFT_PATH_TO_SWIFT_SYNTAX_SOURCE}")
     message(SEND_ERROR "swift-syntax is required to build the Swift compiler. Please run update-checkout or specify SWIFT_PATH_TO_SWIFT_SYNTAX_SOURCE")