Fix build errors when KICAD_SPICE=OFF

eeschema/CMakeLists.txt

@@ -263,8 +263,21 @@ set( EESCHEMA_SRCS
     sch_plugins/legacy/sch_legacy_plugin.cpp
     sch_plugins/legacy/sch_legacy_plugin_helpers.cpp
 
-    # Simulator settings must get built even when the simulator build option is disabled.
+    # Some simulation features must be built even if libngspice is not linked.
     sim/spice_settings.cpp
+    sim/ngspice_models.cpp
+    sim/sim_library.cpp
+    sim/sim_library_spice.cpp
+    sim/sim_model.cpp
+    sim/sim_model_behavioral.cpp
+    sim/sim_model_xspice.cpp
+    sim/sim_model_ideal.cpp
+    sim/sim_model_ngspice.cpp
+    sim/sim_model_spice.cpp
+    sim/sim_model_source.cpp
+    sim/sim_model_subckt.cpp
+    sim/sim_model_tline.cpp
+    sim/sim_value.cpp
 
     tools/assign_footprints.cpp
     tools/backannotate.cpp
@@ -312,7 +325,6 @@ if( KICAD_SPICE )
         dialogs/dialog_sim_model_base.cpp
         sim/ngspice_helpers.cpp
         sim/ngspice.cpp
-        sim/ngspice_models.cpp
         sim/sim_panel_base.cpp
         sim/sim_plot_colors.cpp
         sim/sim_plot_frame.cpp
@@ -320,18 +332,6 @@ if( KICAD_SPICE )
         sim/sim_plot_panel.cpp
         sim/sim_property.cpp
         sim/sim_workbook.cpp
-        sim/sim_library.cpp
-        sim/sim_library_spice.cpp
-        sim/sim_model.cpp
-        sim/sim_model_behavioral.cpp
-        sim/sim_model_xspice.cpp
-        sim/sim_model_ideal.cpp
-        sim/sim_model_ngspice.cpp
-        sim/sim_model_spice.cpp
-        sim/sim_model_source.cpp
-        sim/sim_model_subckt.cpp
-        sim/sim_model_tline.cpp
-        sim/sim_value.cpp
         sim/spice_simulator.cpp
         sim/spice_value.cpp
         widgets/tuner_slider.cpp

qa/unittests/eeschema/test_netlist_exporter_spice.cpp

@@ -21,6 +21,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
+#ifdef KICAD_SPICE
+
 #include <qa_utils/wx_utils/unit_test_utils.h>
 #include <eeschema_test_utils.h>
 #include <netlist_exporter_spice.h>
@@ -275,3 +277,5 @@ BOOST_AUTO_TEST_CASE( LegacySources )
 
 
 BOOST_AUTO_TEST_SUITE_END()
+
+#endif // KICAD_SPICE