all: optimize build

cmake/pch.cmake

@@ -0,0 +1,85 @@
+# pch breaks clang-tidy..... somehow
+if (NOT NO_PCH)
+	file(GENERATE
+		OUTPUT ${CMAKE_BINARY_DIR}/pchstub.cpp
+		CONTENT "// intentionally empty"
+	)
+endif()
+
+function (qs_pch target)
+	if (NO_PCH)
+		return()
+	endif()
+
+	cmake_parse_arguments(PARSE_ARGV 1 arg "" "SET" "")
+
+	if ("${arg_SET}" STREQUAL "")
+		set(arg_SET "common")
+	endif()
+
+	target_precompile_headers(${target} REUSE_FROM "qs-pchset-${arg_SET}")
+endfunction()
+
+function (qs_module_pch target)
+	qs_pch(${target} ${ARGN})
+	qs_pch("${target}plugin" SET plugin)
+	qs_pch("${target}plugin_init" SET plugin)
+endfunction()
+
+function (qs_add_pchset SETNAME)
+	if (NO_PCH)
+		return()
+	endif()
+
+	cmake_parse_arguments(PARSE_ARGV 1 arg "" "" "HEADERS;DEPENDENCIES")
+
+	set(LIBNAME "qs-pchset-${SETNAME}")
+
+	add_library(${LIBNAME} ${CMAKE_BINARY_DIR}/pchstub.cpp)
+	target_link_libraries(${LIBNAME} ${arg_DEPENDENCIES})
+	target_precompile_headers(${LIBNAME} PUBLIC ${arg_HEADERS})
+endfunction()
+
+set(COMMON_PCH_SET
+	<chrono>
+	<memory>
+	<vector>
+	<qdebug.h>
+	<qobject.h>
+	<qmetatype.h>
+	<qstring.h>
+	<qchar.h>
+	<qlist.h>
+	<qabstractitemmodel.h>
+)
+
+qs_add_pchset(common
+	DEPENDENCIES Qt::Quick
+	HEADERS ${COMMON_PCH_SET}
+)
+
+qs_add_pchset(large
+	DEPENDENCIES Qt::Quick
+	HEADERS
+		${COMMON_PCH_SET}
+		<qiodevice.h>
+		<qevent.h>
+		<qcoreapplication.h>
+		<qqmlengine.h>
+		<qquickitem.h>
+		<qquickwindow.h>
+		<qcolor.h>
+		<qdir.h>
+		<qtimer.h>
+		<qabstractitemmodel.h>
+)
+
+
+# including qplugin.h directly will cause required symbols to disappear
+qs_add_pchset(plugin
+	DEPENDENCIES Qt::Qml
+	HEADERS
+		<qobject.h>
+		<qjsonobject.h>
+		<qpointer.h>
+)