[Solved]-No source available for "main()" error for c++ in Eclipse-eclipse

to be able to debug an application, you need to compile it using the -g (debug) flag:

cxxflags=-g

$(objectsqueue): $(sourcesqueue)
$(cxx) $(cxxflags) -c $(sourcesqueue) $(includes)

...

testqueue:  $(objectsqueue) $(objectstestqueue)
$(cxx) $(cxxflags) -o queuetests.exe $(objectsqueue) $(objectstestqueue)

....

you need to use this flag for all compilation rules.