CMake linking problem

[bombela]

CMake linking problem

[bombela]

I haven't worked on the cmake side of things. I really don't understand shit about cmake. I think you could try removing the ${BACKWARD_ENABLE}.

[bombela]

@edisongustavo maybe you have some insight.

[edisongustavo]

(As an aside, the logic located in BackwardConfig.cmake makes it seem like HAS_DW or HAS_BFD could only be true mutually exclusively, was this the intention?)

Not really, if you look at the code in BackwardConfig.cmake you will see that those only represent the detection of each library (libdw and libbfd respectively).

The order that they're applied can be seen on the series of if, elseif:

        if (LIBDW_FOUND)
		LIST(APPEND _BACKWARD_INCLUDE_DIRS ${LIBDW_INCLUDE_DIRS})
		LIST(APPEND BACKWARD_LIBRARIES ${LIBDW_LIBRARIES})
		set(STACK_DETAILS_DW TRUE)
		set(STACK_DETAILS_BFD FALSE)
		set(STACK_DETAILS_BACKTRACE_SYMBOL FALSE)
	elseif(LIBBFD_FOUND)
		LIST(APPEND _BACKWARD_INCLUDE_DIRS ${LIBBFD_INCLUDE_DIRS})
		LIST(APPEND BACKWARD_LIBRARIES ${LIBBFD_LIBRARIES})
		set(STACK_DETAILS_DW FALSE)
		set(STACK_DETAILS_BFD TRUE)
		set(STACK_DETAILS_BACKTRACE_SYMBOL FALSE)
	else()
		set(STACK_DETAILS_DW FALSE)
		set(STACK_DETAILS_BFD FALSE)
		set(STACK_DETAILS_BACKTRACE_SYMBOL TRUE)
	endif()

So in your case what should be done is linking with the libdw library.

I'm curious why you're getting those linking errors. What were the commands you issued? If you used make, could you re-run it with:

VERBOSE=1 make

[ljarin]

Sorry, I had stopped working on the problem I needed this for.
I messed around with it, and adding
target_link_libraries(backward PUBLIC ${BACKWARD_LIBRARIES}) to backward's CMakeLists.txt solved my problem. Not sure I could totally explain why.

[ljarin]

Just kidding, this made my stack traces bad:

         30: backward::SignalHandling sh;
         31: 
      >  32: } // namespace backward

Whatever, I will be satisfied with the old stack traces

[bombela]

Else simply do not bother embedding the cmake config. Simply copy backward.hpp and backward.cpp in your project. Add some basic library detection in your build system if you fancy, else just set the list of libraries, set the corresponding #define and be done with it ;)

[ljarin]

Good point; thanks