Getting a compile error including rosgraph_msgs/Log

asked 2021-03-17 13:24:04 -0500

Rhapsodus
28 ●2 ●4 ●8

updated 2021-03-17 13:41:10 -0500

Greetings,

I am trying to use rosgraph_msgs/Log to subscribe to rosout and when I include the header file I get the following compile error:

<command-line>:0:7: error: expected identifier before numeric constant
/opt/ros/melodic/include/rosgraph_msgs/Log.h:95:5: note: in expansion of macro ‘DEBUG’
     DEBUG = 1,
     ^~~~~
<command-line>:0:7: error: expected ‘}’ before numeric constant
/opt/ros/melodic/include/rosgraph_msgs/Log.h:95:5: note: in expansion of macro ‘DEBUG’
     DEBUG = 1,
     ^~~~~
<command-line>:0:7: error: expected unqualified-id before numeric constant
/opt/ros/melodic/include/rosgraph_msgs/Log.h:95:5: note: in expansion of macro ‘DEBUG’
     DEBUG = 1,
     ^~~~~

In file included from ....
/opt/ros/melodic/include/rosgraph_msgs/Log.h:103:52: error: ‘ContainerAllocator’ was not declared in this scope
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> > Ptr;
                                                    ^~~~~~~~~~~~~~~~~~
/opt/ros/melodic/include/rosgraph_msgs/Log.h:103:70: error: template argument 1 is invalid
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> > Ptr;
                                                                      ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:103:72: error: template argument 1 is invalid
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> > Ptr;
                                                                        ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:104:52: error: ‘ContainerAllocator’ was not declared in this scope
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> const> ConstPtr;
                                                    ^~~~~~~~~~~~~~~~~~
/opt/ros/melodic/include/rosgraph_msgs/Log.h:104:70: error: template argument 1 is invalid
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> const> ConstPtr;
                                                                      ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:104:77: error: template argument 1 is invalid
   typedef boost::shared_ptr< ::rosgraph_msgs::Log_<ContainerAllocator> const> ConstPtr;
                                                                             ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:110:45: error: ‘Log’ is not a member of ‘rosgraph_msgs’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log > LogPtr;
                                             ^~~
/opt/ros/melodic/include/rosgraph_msgs/Log.h:110:45: note: suggested alternative: ‘Log_’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log > LogPtr;
                                             ^~~
                                             Log_
/opt/ros/melodic/include/rosgraph_msgs/Log.h:110:45: error: ‘Log’ is not a member of ‘rosgraph_msgs’
/opt/ros/melodic/include/rosgraph_msgs/Log.h:110:45: note: suggested alternative: ‘Log_’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log > LogPtr;
                                             ^~~
                                             Log_
/opt/ros/melodic/include/rosgraph_msgs/Log.h:110:49: error: template argument 1 is invalid
 typedef boost::shared_ptr< ::rosgraph_msgs::Log > LogPtr;
                                                 ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:111:45: error: ‘Log’ is not a member of ‘rosgraph_msgs’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log const> LogConstPtr;
                                             ^~~
/opt/ros/melodic/include/rosgraph_msgs/Log.h:111:45: note: suggested alternative: ‘Log_’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log const> LogConstPtr;
                                             ^~~
                                             Log_
/opt/ros/melodic/include/rosgraph_msgs/Log.h:111:45: error: ‘Log’ is not a member of ‘rosgraph_msgs’
/opt/ros/melodic/include/rosgraph_msgs/Log.h:111:45: note: suggested alternative: ‘Log_’
 typedef boost::shared_ptr< ::rosgraph_msgs::Log const> LogConstPtr;
                                             ^~~
                                             Log_
/opt/ros/melodic/include/rosgraph_msgs/Log.h:111:54: error: template argument 1 is invalid
 typedef boost::shared_ptr< ::rosgraph_msgs::Log const> LogConstPtr;
                                                      ^
/opt/ros/melodic/include/rosgraph_msgs/Log.h:155:1: error: expected declaration before ‘}’ token
 } // namespace rosgraph_msgs
 ^

When I comment out #include <rosgraph_msgs log.h=""> I compile fine. rosgraph_msgs is added to my catkin_package in cmake and in my package.xml. Versions: 1.11.2-0bionic.20201017.050047

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answered 2021-03-17 16:06:02 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

updated 2021-03-17 16:09:16 -0500

You provide very little information (not even the platform / OS you're building this on), so this is just a guess.

The error you show has this:

/opt/ros/melodic/include/rosgraph_msgs/Log.h:95:5: note: in expansion of macro ‘DEBUG’
     DEBUG = 1,

DEBUG is not a macro in /opt/ros/melodic/include/rosgraph_msgs/Log.h, but a member of an enum.

From /opt/ros/melodic/include/rosgraph_msgs/Log.h:

  enum {
    DEBUG = 1,
    INFO = 2,
    WARN = 4,
    ERROR = 8,
    FATAL = 16,
  };

Would you perhaps happen to have #defined a DEBUG macro yourself? Or have you used #define DEBUG <some_value> yourself?

That could cause this problem as the symbols would clash.

The rest of the errors are not interesting at this point, as it's very likely they're caused by the compiler trying to make sense of the rest of the file, which it can't.

Is there a hidden header dependency?

if that was the case, in code which is around 12 years old, we would have probably seen more reports about this.

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First off, I appreciate the help and sorry for not posting the Melodic / Ubuntu version. You are spot on correct here. There was a less than obvious Debug flag being set in the CmakeLists file. Removing these allowed the conflict to resolve.

set(CMAKE_C_FLAGS_DEBUG "-g -DDEBUG")
set(CMAKE_CXX_FLAGS_DEBUG "-g -DDEBUG")

Rhapsodus ( 2021-03-17 18:49:01 -0500 )edit

Hm. I would not have expected those defines to cause a problem. We compile many parts of ROS with Debug settings enabled, and I've not run into a conflict there.

Are you sure it was those?

gvdhoorn ( 2021-03-18 03:11:20 -0500 )edit

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