build: Make it possible to turn off the main compositor lib and runtime target.

CMakeLists.txt

@@ -65,6 +65,11 @@ cmake_dependent_option(BUILD_WITH_XLIB "Enable xlib support" ON "X11_FOUND" OFF)
 cmake_dependent_option(BUILD_WITH_XCB "Enable xcb support" ON "XCB_FOUND" OFF)
 cmake_dependent_option(BUILD_WITH_OPENGL "Enable OpenGL Graphics API support" ON "OPENGL_FOUND" OFF)
 cmake_dependent_option(BUILD_WITH_EGL "Enable OpenGL on EGL Graphics API support" ON "BUILD_WITH_OPENGL AND EGL_FOUND" OFF)
+cmake_dependent_option(BUILD_COMPOSITOR_MAIN "Build main compositor host" ON "BUILD_WITH_WAYLAND OR BUILD_WITH_XCB" OFF)
+cmake_dependent_option(BUILD_TARGET_OPENXR "Build OpenXR runtime target" ON "BUILD_COMPOSITOR_MAIN" OFF)
+
+# Most users won't touch these.
+mark_as_advanced(BUILD_COMPOSITOR_MAIN BUILD_TARGET_OPENXR)
 
 set(BUILD_WITH_LIBUSB TRUE)
 cmake_dependent_option(BUILD_WITH_JPEG "Enable jpeg code (used for some video drivers)" ON "JPEG_FOUND" OFF)

src/xrt/compositor/CMakeLists.txt

@@ -82,60 +82,63 @@ add_library(comp_client OBJECT ${CLIENT_SOURCE_FILES})
 # Main library
 #
 
-if(BUILD_WITH_XCB)
-	list(APPEND MAIN_SOURCE_FILES
-		main/comp_window_xcb.cpp
+if(BUILD_COMPOSITOR_MAIN)
+
+	if(BUILD_WITH_XCB)
+		list(APPEND MAIN_SOURCE_FILES
+			main/comp_window_xcb.cpp
+			)
+	endif()
+	if(BUILD_WITH_XCB AND BUILD_WITH_XLIB)
+		list(APPEND MAIN_SOURCE_FILES
+			main/comp_window_direct_mode.cpp
+			)
+	endif()
+
+	# generate wayland protocols
+	if(BUILD_WITH_WAYLAND)
+		pkg_get_variable(WL_PROTOS_PKG_DIR wayland-protocols pkgdatadir)
+		pkg_get_variable(WL_SCANNER wayland-scanner wayland_scanner)
+
+		set(WL_PROTOS_DIR "${CMAKE_CURRENT_BINARY_DIR}/wayland-protocols/")
+		file(MAKE_DIRECTORY "${WL_PROTOS_DIR}")
+
+		set(WL_PROTOS_XML "${WL_PROTOS_PKG_DIR}/stable/xdg-shell/xdg-shell.xml")
+		set(WL_PROTOS_C "${WL_PROTOS_DIR}/xdg-shell.c")
+		set(WL_PROTOS_H "${WL_PROTOS_DIR}/xdg-shell-client-protocol.h")
+
+		add_custom_command(
+			COMMAND
+			${WL_SCANNER} private-code "${WL_PROTOS_XML}" "${WL_PROTOS_C}"
+			OUTPUT "${WL_PROTOS_C}" VERBATIM)
+
+		add_custom_command(
+			COMMAND
+			${WL_SCANNER} client-header "${WL_PROTOS_XML}" "${WL_PROTOS_H}"
+			OUTPUT "${WL_PROTOS_H}" VERBATIM)
+
+		set(WL_PROTOS_SRC ${WL_PROTOS_C} ${WL_PROTOS_H})
+		list(APPEND MAIN_SOURCE_FILES
+			main/comp_window_wayland.c
+			)
+	endif()
+
+	# Use OBJECT to not create a archive, since it just gets in the way.
+	add_library(comp_main OBJECT ${SHADER_HEADERS} ${MAIN_SOURCE_FILES} ${WL_PROTOS_SRC})
+	target_include_directories(comp_main SYSTEM PRIVATE
+		# Shaders - marked SYSTEM so we get no warnings
+		${CMAKE_CURRENT_BINARY_DIR}
 		)
-endif()
-if(BUILD_WITH_XCB AND BUILD_WITH_XLIB)
-	list(APPEND MAIN_SOURCE_FILES
-		main/comp_window_direct_mode.cpp
-		)
-endif()
-
-# generate wayland protocols
-if(BUILD_WITH_WAYLAND)
-	pkg_get_variable(WL_PROTOS_PKG_DIR wayland-protocols pkgdatadir)
-	pkg_get_variable(WL_SCANNER wayland-scanner wayland_scanner)
-
-	set(WL_PROTOS_DIR "${CMAKE_CURRENT_BINARY_DIR}/wayland-protocols/")
-	file(MAKE_DIRECTORY "${WL_PROTOS_DIR}")
 
-	set(WL_PROTOS_XML "${WL_PROTOS_PKG_DIR}/stable/xdg-shell/xdg-shell.xml")
-	set(WL_PROTOS_C "${WL_PROTOS_DIR}/xdg-shell.c")
-	set(WL_PROTOS_H "${WL_PROTOS_DIR}/xdg-shell-client-protocol.h")
-
-	add_custom_command(
-		COMMAND
-		${WL_SCANNER} private-code "${WL_PROTOS_XML}" "${WL_PROTOS_C}"
-		OUTPUT "${WL_PROTOS_C}" VERBATIM)
-
-	add_custom_command(
-		COMMAND
-		${WL_SCANNER} client-header "${WL_PROTOS_XML}" "${WL_PROTOS_H}"
-		OUTPUT "${WL_PROTOS_H}" VERBATIM)
-
-	set(WL_PROTOS_SRC ${WL_PROTOS_C} ${WL_PROTOS_H})
-	list(APPEND MAIN_SOURCE_FILES
-		main/comp_window_wayland.c
-		)
+	if(BUILD_WITH_WAYLAND)
+		target_include_directories(comp_main SYSTEM PRIVATE ${WL_PROTOS_DIR})
+	endif()
+	if(BUILD_WITH_XCB)
+		target_include_directories(comp_main SYSTEM PRIVATE ${XCB_INCLUDE_DIRS})
+	endif()
+	if(BUILD_WITH_EGL)
+		target_include_directories(comp_main SYSTEM PRIVATE ${EGL_INCLUDE_DIRS})
+	endif()
+
+	add_subdirectory(shaders)
 endif()
-
-# Use OBJECT to not create a archive, since it just gets in the way.
-add_library(comp_main OBJECT ${SHADER_HEADERS} ${MAIN_SOURCE_FILES} ${WL_PROTOS_SRC})
-target_include_directories(comp_main SYSTEM PRIVATE
-	# Shaders - marked SYSTEM so we get no warnings
-	${CMAKE_CURRENT_BINARY_DIR}
-	)
-
-if(BUILD_WITH_WAYLAND)
-	target_include_directories(comp_main SYSTEM PRIVATE ${WL_PROTOS_DIR})
-endif()
-if(BUILD_WITH_XCB)
-	target_include_directories(comp_main SYSTEM PRIVATE ${XCB_INCLUDE_DIRS})
-endif()
-if(BUILD_WITH_EGL)
-	target_include_directories(comp_main SYSTEM PRIVATE ${EGL_INCLUDE_DIRS})
-endif()
-
-add_subdirectory(shaders)

src/xrt/targets/CMakeLists.txt

@@ -72,7 +72,9 @@ if(BUILD_TRACKING)
 endif()
 
 add_subdirectory(common)
-add_subdirectory(openxr)
+if(BUILD_TARGET_OPENXR)
+	add_subdirectory(openxr)
+endif()
 add_subdirectory(cli)
 
 if(BUILD_TARGET_GUI)