v3: key cold cache objects by program wrappers

Author: medvednikov

vlib/v3/driver/driver.v

@@ -10546,8 +10546,9 @@ fn prepare_v3_module_cache(generated_source string, cache_used_fns &map[string]b
 		''
 	}
 	declarations := cache_source_without_cached_native_inputs(raw_declarations, state, false)
-	compile_signature := v3_cached_object_compile_signature(c_standard, opt_flag, pic_flag,
-		warning_flags, generated_c_flags, objective_c, interface_impl_signature)
+	compile_signature := v3_cached_object_wrapper_compile_signature(v3_cached_object_compile_signature(c_standard,
+		opt_flag, pic_flag, warning_flags, generated_c_flags, objective_c, interface_impl_signature),
+		generated_source)
 	if resolve_flag_specific_cache_objects(mut state, compile_signature) {
 		os.setenv('V3_CACHE_FORCE_SOURCE', '1', true)
 		restart_v3_after_cache_invalidation()

vlib/v3/tests/module_cache_test.v

@@ -1107,6 +1107,9 @@ fn main() {
 	first_output := os.join_path(root, 'first')
 	compile_module_cache_project(v3_bin, cache_dir, first_main, first_output)
 	assert run_module_cache_binary(first_output) == '42'
+	first_builtin_objects :=
+		module_cache_object_hashes(cache_dir).keys().filter(it.starts_with('builtin_'))
+	assert first_builtin_objects.len > 0
 
 	second_main := os.join_path(root, 'second_main.v')
 	write_module_cache_file(root, 'second_main.v', 'module main
@@ -1118,6 +1121,9 @@ fn main() {
 	second_output := os.join_path(root, 'second')
 	compile_module_cache_project(v3_bin, cache_dir, second_main, second_output)
 	assert run_module_cache_binary(second_output) == '42'
+	second_builtin_objects :=
+		module_cache_object_hashes(cache_dir).keys().filter(it.starts_with('builtin_'))
+	assert second_builtin_objects.len > first_builtin_objects.len
 }
 
 fn test_module_cache_static_inline_attributes_are_not_storage() {