xW: improve beeping

This adds yet another build dependency,
but it's better than the alternatives of handling it in code.

xW/CMakeLists.txt

@@ -59,6 +59,13 @@ function (icon_for_win32 ico pngs pngs_raw)
 		COMMENT "Generating Windows program icon" VERBATIM)
 endfunction ()
 
+# Produce a beep sample
+find_program (sox_EXECUTABLE sox ${find_program_REQUIRE})
+add_custom_command (OUTPUT beep.wav
+	COMMAND ${sox_EXECUTABLE} -b 16 -Dr 44100 -n beep.wav
+		synth 0.1 0 25 triangle 800 vol 0.5 fade t 0 -0 0.005 pad 0 0.05
+	COMMENT "Generating a beep sample" VERBATIM)
+
 # Rasterize SVG icons
 set (icon_ico_list)
 foreach (icon xW xW-highlighted)
@@ -76,7 +83,8 @@ foreach (icon xW xW-highlighted)
 	list (APPEND icon_ico_list ${icon_ico})
 endforeach ()
 
-set_property (SOURCE xW.rc APPEND PROPERTY OBJECT_DEPENDS ${icon_ico_list})
+set_property (SOURCE xW.rc
+	APPEND PROPERTY OBJECT_DEPENDS ${icon_ico_list} beep.wav)
 
 # Build the main executable and link it
 set (root "${PROJECT_SOURCE_DIR}/..")
@@ -97,7 +105,7 @@ add_custom_target (xC-proto DEPENDS ${PROJECT_BINARY_DIR}/xC-proto.cpp)
 
 add_executable (xW WIN32 xW.cpp xW.rc xW.manifest ${project_config}
 	${root}/liberty/tools/lxdrgen-cpp-win32.cpp)
-target_link_libraries (xW comctl32 ws2_32)
+target_link_libraries (xW comctl32 ws2_32 winmm)
 add_dependencies (xW xC-proto)
 
 # At least with MinGW, this is a fully independent portable executable