CPackRPM even more trace in debug mode or in case of failure

Modules/CPackRPM.cmake

@@ -640,12 +640,17 @@ IF(RPMBUILD_EXECUTABLE)
             --buildroot "${CPACK_RPM_DIRECTORY}/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}"
             "${CPACK_RPM_BINARY_SPECFILE}"
     WORKING_DIRECTORY "${CPACK_TOPLEVEL_DIRECTORY}/${CPACK_PACKAGE_FILE_NAME}${CPACK_RPM_PACKAGE_COMPONENT_PART_PATH}"
+    RESULT_VARIABLE CPACK_RPMBUILD_EXEC_RESULT
     ERROR_FILE "${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.err"
     OUTPUT_FILE "${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.out")
-  IF(CPACK_RPM_PACKAGE_DEBUG)
+  IF(CPACK_RPM_PACKAGE_DEBUG OR CPACK_RPMBUILD_EXEC_RESULT)
+    FILE(READ ${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.err RPMBUILDERR)
+    FILE(READ ${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.out RPMBUILDOUT)
     MESSAGE("CPackRPM:Debug: You may consult rpmbuild logs in: ")
     MESSAGE("CPackRPM:Debug:    - ${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.err")
+    MESSAGE("CPackRPM:Debug: *** ${RPMBUILDERR} ***")
     MESSAGE("CPackRPM:Debug:    - ${CPACK_TOPLEVEL_DIRECTORY}/rpmbuild${CPACK_RPM_PACKAGE_COMPONENT_PART_NAME}.out")
+    MESSAGE("CPackRPM:Debug: *** ${RPMBUILDERR} ***")
   ENDIF(CPACK_RPM_PACKAGE_DEBUG)
 ELSE(RPMBUILD_EXECUTABLE)
   IF(ALIEN_EXECUTABLE)