Get all the tests linking with shared-simgear, and duplicate the awkward core functions into a new file, pending a proper cleanup.

simgear/math/CMakeLists.txt

@@ -46,11 +46,19 @@ set(SOURCES
 simgear_component(math math "${SOURCES}" "${HEADERS}")
 
 if(ENABLE_TESTS)
+
+if (SIMGEAR_SHARED)
+    set(TEST_LIBS SimGearCore)
+else()
+    set(TEST_LIBS sgmath sgstructure sgdebug)
+endif()
+
+
 add_executable(math_test SGMathTest.cxx)
-target_link_libraries(math_test sgmath sgstructure sgdebug)
+target_link_libraries(math_test ${TEST_LIBS})
 add_test(math ${EXECUTABLE_OUTPUT_PATH}/math_test)
 
 add_executable(geometry_test SGGeometryTest.cxx)
-target_link_libraries(geometry_test sgmath sgstructure sgdebug)
+target_link_libraries(geometry_test ${TEST_LIBS})
 add_test(geometry ${EXECUTABLE_OUTPUT_PATH}/geometry_test)
 endif(ENABLE_TESTS)