initial changes

cmake/libraries/backward_cpp.cmake

@@ -0,0 +1,11 @@
+if(PROJECT_ENABLE_BACKWARD_CPP AND PROJECT_BUILD)
+  if(PROJECT_IS_MINGW)
+    add_definitions(-DPROJECT_ENABLE_BACKWARD_CPP)
+
+    link_libraries(msvcr90)
+  else()
+    add_definitions(-DBACKWARD_HAS_BFD)
+
+    link_libraries(bfd)
+  endif()
+endif()