Bug#36678092 Contribution: Build failure with Protobuf 22+ in Linux

Add explicit INTERFACE_LINK_LIBRARIES for "system" protobuf on Linux.
This will be essential when building with protobuf version 22+

The patch is based on a contribution by Github user: gordonwwang

Change-Id: I5bc0932144f3ad0b340e383d0ce8afdda821874b
(cherry picked from commit d31d3aa0b3623061b012f596e25df08a7f294973)

cmake/fileutils.cmake

@@ -119,6 +119,27 @@ IF(APPLE)
 ENDIF(APPLE)
 
 IF(LINUX)
+  # Parse output of 'ldd ${FILE_NAME}' and return anything starting with lib.
+  FUNCTION(FIND_LIBRARY_DEPENDENCIES FILE_NAME RETURN_VALUE)
+    SET(${RETURN_VALUE} PARENT_SCOPE)
+    EXECUTE_PROCESS(COMMAND
+      ldd "${FILE_NAME}"
+      OUTPUT_VARIABLE LDD_OUTPUT
+      RESULT_VARIABLE LDD_RESULT
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      )
+    STRING(REPLACE "\n" ";" LDD_OUTPUT_LIST "${LDD_OUTPUT}")
+    SET(DEPENDENCIES)
+    FOREACH(LINE ${LDD_OUTPUT_LIST})
+      STRING(REGEX MATCH "^[\t ]+(lib[-+_A-Za-z0-9\\.]+).*" UNUSED ${LINE})
+      IF(CMAKE_MATCH_1)
+        # MESSAGE(STATUS "xxx ${FILE_NAME} ${CMAKE_MATCH_1}")
+        LIST(APPEND DEPENDENCIES ${CMAKE_MATCH_1})
+      ENDIF()
+    ENDFOREACH()
+    SET(${RETURN_VALUE} ${DEPENDENCIES} PARENT_SCOPE)
+  ENDFUNCTION(FIND_LIBRARY_DEPENDENCIES)
+
   FUNCTION(FIND_OBJECT_DEPENDENCIES FILE_NAME RETURN_VALUE)
     SET(${RETURN_VALUE} PARENT_SCOPE)
     EXECUTE_PROCESS(COMMAND

cmake/protobuf.cmake

@@ -155,23 +155,41 @@ MACRO(MYSQL_CHECK_PROTOBUF)
     # set_property(TARGET protobuf::libprotobuf APPEND PROPERTY
     #              INTERFACE_COMPILE_FEATURES cxx_std_11
     #             )
+    # INTERFACE_LINK_LIBRARIES will be needed once this is built
+    # with protobuf 22 and above (lots of abseil libs).
     ADD_LIBRARY(ext::libprotobuf UNKNOWN IMPORTED)
     SET_TARGET_PROPERTIES(ext::libprotobuf PROPERTIES
       INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${Protobuf_INCLUDE_DIR}")
     SET_TARGET_PROPERTIES(ext::libprotobuf PROPERTIES
       IMPORTED_LOCATION "${PROTOBUF_LIBRARY}")
+    IF(LINUX)
+      FIND_LIBRARY_DEPENDENCIES("${PROTOBUF_LIBRARY}" protobuf_dependencies)
+      SET_TARGET_PROPERTIES(ext::libprotobuf PROPERTIES
+        INTERFACE_LINK_LIBRARIES "${protobuf_dependencies}")
+    ENDIF()
 
     ADD_LIBRARY(ext::libprotobuf-lite UNKNOWN IMPORTED)
     SET_TARGET_PROPERTIES(ext::libprotobuf-lite PROPERTIES
       INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${Protobuf_INCLUDE_DIR}")
     SET_TARGET_PROPERTIES(ext::libprotobuf-lite PROPERTIES
       IMPORTED_LOCATION "${PROTOBUF_LITE_LIBRARY}")
+    IF(LINUX)
+      FIND_LIBRARY_DEPENDENCIES("${PROTOBUF_LITE_LIBRARY}" lite_dependencies)
+      SET_TARGET_PROPERTIES(ext::libprotobuf-lite PROPERTIES
+        INTERFACE_LINK_LIBRARIES "${lite_dependencies}")
+    ENDIF()
 
     ADD_LIBRARY(ext::libprotoc UNKNOWN IMPORTED)
     SET_TARGET_PROPERTIES(ext::libprotoc PROPERTIES
       INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${Protobuf_INCLUDE_DIR}")
     SET_TARGET_PROPERTIES(ext::libprotoc PROPERTIES
       IMPORTED_LOCATION "${Protobuf_PROTOC_LIBRARY}")
+    IF(LINUX)
+      FIND_LIBRARY_DEPENDENCIES(
+        "${Protobuf_PROTOC_LIBRARY}" protoc_dependencies)
+      SET_TARGET_PROPERTIES(ext::libprotoc PROPERTIES
+        INTERFACE_LINK_LIBRARIES "${protoc_dependencies}")
+    ENDIF()
   ENDIF()
 
   FIND_PROTOBUF_VERSION()