Add SIMU_TARGET build option to exclude libsimulator & simu from all/install.

companion/src/CMakeLists.txt

@@ -333,8 +333,10 @@ string(TOLOWER ${PCB} FLAVOUR)
 if(POLICY CMP0026)
   cmake_policy(SET CMP0026 OLD)  # https://cmake.org/cmake/help/v3.0/policy/CMP0026.html
 endif()
-get_property(current_plugin TARGET opentx-${FLAVOUR}-simulator PROPERTY LOCATION)
-list(APPEND simulator_plugins "${current_plugin}")
+if(SIMU_TARGET)
+  get_property(current_plugin TARGET opentx-${FLAVOUR}-simulator PROPERTY LOCATION)
+  list(APPEND simulator_plugins "${current_plugin}")
+endif()
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 

radio/src/targets/simu/CMakeLists.txt

@@ -1,3 +1,10 @@
+
+option(SIMU_TARGET "Configure libsimulator/simu targets (can be turned off for compiling Companion only)" ON)
+if(NOT SIMU_TARGET)
+  message(STATUS "libsimulator/simu targets disabled")
+  return()
+endif()
+
 foreach(FILE ${SRC})
   set(SIMU_SRC ${SIMU_SRC} ../../${FILE})
 endforeach()