wip: simulator: guard GenerateHostEvent

This feature is currently only available on Linux, but we don't want a
platform-specific guard - not in itself, anyway - so guard it with
`KALEIDOSCOPE_VIRTUAL_HOST_EVENTS`, _and_ a linux-guard within.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/simulator/actions/generic_report/GenerateHostEvent.cpp

@@ -18,6 +18,12 @@
 
 #ifdef KALEIDOSCOPE_VIRTUAL_BUILD
 
+#ifdef KALEIDOSCOPE_VIRTUAL_HOST_EVENTS
+
+#ifndef __linux__
+#error Generating host events is only supported on Linux at the moment.
+#endif
+
 #include "kaleidoscope/simulator/actions/generic_report/GenerateHostEvent.h"
 #include "kaleidoscope/simulator/reports/BootKeyboardReport.h"
 #include "kaleidoscope/simulator/reports/KeyboardReport.h"
@@ -396,4 +402,5 @@ bool GenerateHostEvent<AbsoluteMouseReport>::Action::evalInternal() {
 #error __CLANG_ATOMIC_LLONG_LOCK_FREE
 #endif
 
+#endif // KALEIDOSCOPE_VIRTUAL_HOST_EVENTS
 #endif // KALEIDOSCOPE_VIRTUAL_BUILD

src/kaleidoscope/simulator/actions/generic_report/GenerateHostEvent.h

@@ -19,6 +19,7 @@
 #pragma once
 
 #ifdef KALEIDOSCOPE_VIRTUAL_BUILD
+#ifdef KALEIDOSCOPE_VIRTUAL_HOST_EVENTS
 
 #include "kaleidoscope/simulator/interface/actions/generic_report/ReportAction.h"
 #include "kaleidoscope/simulator/interface/reports/Report_.h"
@@ -87,4 +88,5 @@ class GenerateHostEvent {
 } // namespace simulator
 } // namespace kaleidoscope
 
+#endif // KALEIDOSCOPE_VIRTUAL_HOST_EVENTS
 #endif // KALEIDOSCOPE_VIRTUAL_BUILD