/usr/share/std_msgs/cmake/std_msgs-msg-extras.cmake is in libstd-msgs-dev 0.5.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | set(std_msgs_MESSAGE_FILES "msg/Bool.msg;msg/Byte.msg;msg/ByteMultiArray.msg;msg/Char.msg;msg/ColorRGBA.msg;msg/Duration.msg;msg/Empty.msg;msg/Float32.msg;msg/Float32MultiArray.msg;msg/Float64.msg;msg/Float64MultiArray.msg;msg/Header.msg;msg/Int16.msg;msg/Int16MultiArray.msg;msg/Int32.msg;msg/Int32MultiArray.msg;msg/Int64.msg;msg/Int64MultiArray.msg;msg/Int8.msg;msg/Int8MultiArray.msg;msg/MultiArrayDimension.msg;msg/MultiArrayLayout.msg;msg/String.msg;msg/Time.msg;msg/UInt16.msg;msg/UInt16MultiArray.msg;msg/UInt32.msg;msg/UInt32MultiArray.msg;msg/UInt64.msg;msg/UInt64MultiArray.msg;msg/UInt8.msg;msg/UInt8MultiArray.msg")
set(std_msgs_SERVICE_FILES "")
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