[CMake] On Windows when building the examples copy the Z3 library

into the directory of the example executable so that it works "out
of the box".

contrib/cmake/examples/tptp/CMakeLists.txt

@@ -20,3 +20,20 @@ message(STATUS "Z3_DIR: ${Z3_DIR}")
 add_executable(z3_tptp5 tptp5.cpp tptp5.lex.cpp)
 target_include_directories(z3_tptp5 PRIVATE ${Z3_CXX_INCLUDE_DIRS})
 target_link_libraries(z3_tptp5 PRIVATE ${Z3_LIBRARIES})
+
+if ("${CMAKE_SYSTEM_NAME}" MATCHES "[Ww]indows")
+  # On Windows we need to copy the Z3 libraries
+  # into the same directory as the executable
+  # so that they can be found.
+  foreach (z3_lib ${Z3_LIBRARIES})
+    message(STATUS "Adding copy rule for ${z3_lib}")
+    add_custom_command(TARGET z3_tptp5
+      POST_BUILD
+      COMMAND
+        ${CMAKE_COMMAND} -E copy_if_different
+        $<TARGET_FILE:${z3_lib}>
+        $<TARGET_FILE_DIR:z3_tptp5>
+    )
+  endforeach()
+endif()
+