Wt

Your g command is clearly lacking the wt libraries: add -lwt, -lwtfcgi.

Other than that, you may have to add paths to include/library files (though I don't think this will be required on debian).

Know that using the built-in http server is easier to get to work than using an fcgi configuration for a webserver.

Wim.

I'm getting "cannot find -lwtfcgi" so I think you may indeed be right that I need to specify the include path. I am new to C compiling on Linux (though not to C) and wondering if you can point me in the right direction to make that happen if that does seem to be what's going on?

The new command executed was:

@g hello_witty.cpp -lfcgi -lfcgi -lwt -lwtfcgi -o witty_obj

Thanks again.

This seams a reasonable explanation: http://courses.cs.washington.edu/courses/cse373/99au/unix/g.html

But you will want to learn how to interpret the error messages as you need to distinguish between compile errors and linking errors.

Alternatively you can do the compilation separately from the linking:

g -o hello_witty.o -c hello_witty.c #compilation

g -o witty_obj hello_witty.o -lfcgi -lfcgi -lwtfcgi -lwt -o witty_obj #linking

If you get 'cannot find wtfcgi' then you need to find for the location of 'libwtfcgi.*' on your system, and add -L/that/dir to the link command.

I've done sudo find / -name libwtfcgi but it finds nothing, but when I do apt-get install witty witty-dbg witty-dev witty-doc it says everything is up to date.

Help?

sudo find / -name "libwtfcgi*" should pick up the correct file?

It found one instance called:

/usr/lib/debug/usr/lib/libwtfcgi.so.3.3.0

I tried compiling with -L/usr/lib/debug/usr/lib/ with no success

I then tried moving a copy of libwtfcgi.so.3.3.0 to /home/me/sandbox/cpp/lib and compiling with:

g++ hello_witty.cpp -lfcgi++ -lfcgi -lwt -lwtfcgi -o witty_obj -L/home/me/sandbox/cpp/lib

No effect. Witty still fails to compile because that library cannot be found.

Thoughts?

/usr/lib/debug/usr/lib/libwtfcgi.so.3.3.0 is a library used by an executable that is already linked.

For development, you also need a file (which is usually a symlink):

/usr/lib/debug/usr/lib/libwtfcgi.so

This file is being searched by the linker when you specify -lwtfcgi.

Regards,

koen

After doing sudo ln -s /usr/lib/debug/usr/lib/libwtfcgi.so.3.3.0 /usr/lib/debug/usr/lib/libwtfcgi.so AND appending -L/usr/lib/debug/usr/lib/ to the compilation arguments I now get this:

meme-VirtualBox:~/sandbox/cpp$ g hello_witty.cpp -lwt -lwtfcgi -o witty_obj -L/usr/lib/debug/usr/lib/

In file included from /usr/include/Wt/WSignal:17:0,

from /usr/include/Wt/WWidget:14,

from /usr/include/Wt/WWebWidget:14,

from /usr/include/Wt/WBreak:10,

from /usr/include/Wt/WCssStyleSheet:14,

from /usr/include/Wt/WApplication:26,

from hello_witty.cpp:7:

/usr/include/boost/signal.hpp:17:4: warning: #warning "Boost.Signals is no longer being maintained and is now deprecated. Please switch to Boost.Signals2. To disable this warning message, define BOOST_SIGNALS_NO_DEPRECATION_WARNING." [-Wcpp]

# warning "Boost.Signals is no longer being maintained and is now deprecated. Please switch to Boost.Signals2. To disable this warning message, define BOOST_SIGNALS_NO_DEPRECATION_WARNING."

^

/usr/bin/ld: /tmp/ccX5lvgp.o: undefined reference to symbol '_ZN5boost7signals6detail9slot_base17create_connectionEv'

//usr/lib/x86_64-linux-gnu/libboost_signals.so.1.54.0: error adding symbols: DSO missing from command line

collect2: error: ld returned 1 exit status@

Any ideas? I don't think this is a stupid question?...

It seems that you don't link to the boost signals library. Add the boost signals library (-lboostsignals, but the name depends on your boost installation) to your compilation command line.

Best regards,

Wim.