Soften the HID dependency, so we can build

without HID if the necessary 3rdparty libs are not found.

3rdparty/hidapi/CMakeLists.txt

@@ -1,4 +1,5 @@
 
+
 set(HIDAPI_SOURCES
     hidapi/hidapi.h
     hidapi/hidparse.h
@@ -17,26 +18,27 @@ endif(WIN32)
 #add_definitions( -DHAVE_CONFIG_H ) # to use fgfs config.h to get FG version, if needed
 #add_definitions( -DLIBVER="SVN 261" ) # add an iaxclient_lib version string
 
-add_library(hidapi STATIC 
+add_library(hidapi STATIC
-    ${HIDAPI_SOURCES} 
+    ${HIDAPI_SOURCES}
 )
 
-# only needed for Linux, but doesn't do any harm here
-target_link_libraries(hidapi ${UDEV_LIBRARIES})
-
 if(WIN32)
     find_library(SETUP_API_LIB Setupapi)
 	if (NOT SETUP_API_LIB)
-		message(WARNING "Failed to find Setupapi.lib")
+        message(FATAL_ERROR "Failed to find Setupapi.lib")
-	endif()
+    endif()
-
     target_link_libraries(hidapi ${SETUP_API_LIB})
-endif()
+elseif(APPLE)
-
-
-if(APPLE)
     find_library(IOKIT_FRAMEWORK IOKit)
     target_link_libraries(hidapi ${IOKIT_FRAMEWORK})
+else()
+    # Linux-y things
+    find_package(UDev)
+    if (UDEV_FOUND)
+        target_link_libraries(hidapi ${UDEV_LIBRARIES})
+    else()
+		message(FATAL_ERROR "Failed to find UDev")
+	endif()
 endif()
 
 target_include_directories(hidapi PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/hidapi)

CMakeLists.txt

@@ -123,7 +123,10 @@ IF(APPLE)
     find_library(COCOA_LIBRARY Cocoa)
     list(APPEND PLATFORM_LIBS ${COCOA_LIBRARY} ${CORESERVICES_LIBRARY})
 elseif(WIN32)
-    set(EVENT_INPUT_DEFAULT 1)
+    find_library(SETUP_API_LIB Setupapi)
+    if (SETUP_API_LIB)
+        set(EVENT_INPUT_DEFAULT 1)
+    endif()
 
     list(APPEND PLATFORM_LIBS "Shlwapi.lib")
 
@@ -197,12 +200,11 @@ option(ENABLE_JS_DEMO    "Set to ON to build the js_demo application (default)"
 option(ENABLE_METAR      "Set to ON to build the metar application (default)" ON)
 option(ENABLE_STGMERGE   "Set to ON to build the stgmerge application (default)" OFF)
 option(ENABLE_FGCOM      "Set to ON to build the FGCom application (default)" ON)
-option(ENABLE_FLITE      "Set to ON to build the Flite text-to-speech module" ON)
 option(ENABLE_QT         "Set to ON to build the internal Qt launcher" ON)
 option(ENABLE_TRAFFIC    "Set to ON to build the external traffic generator modules" ON)
 option(ENABLE_FGQCANVAS  "Set to ON to build the Qt-based remote canvas application" OFF)
 option(ENABLE_DEMCONVERT "Set to ON to build the dem conversion tool (default)" ON)
-option(ENABLE_HID_INPUT  "Set to ON to build HID-based input code" ON)
+option(ENABLE_HID_INPUT  "Set to ON to build HID-based input code" ${EVENT_INPUT_DEFAULT})
 option(ENABLE_PLIB_JOYSTICK  "Set to ON to enable legacy joystick code (default)" ON)
 option(ENABLE_COMPOSITOR "Set to ON to enable the Compositor-based Viewer" OFF)
 option(ENABLE_SWIFT      "Set to ON to build the swift module" ON)
@@ -259,7 +261,13 @@ if(EVENT_INPUT)
         endif()
     else()
         # Windows
-        add_definitions(-DWITH_EVENTINPUT)
+        if (NOT SETUP_API_LIB)
+            message(WARNING "Setupapi.lib not found, HID/event input is disabled")
+            set(ENABLE_HID_INPUT 0)
+            set(EVENT_INPUT 0)
+        else()
+            add_definitions(-DWITH_EVENTINPUT)
+        endif()
     endif()
 
     if (ENABLE_HID_INPUT)