v.markused: mark all `pub` functions on `-shared -skip-unused`

examples/dynamic_library_loading/use_test.v

@@ -11,20 +11,19 @@ const (
 )
 
 fn test_vexe() {
-	dump(vexe)
+	// dump(vexe)
 	assert vexe != ''
-	dump(os.executable())
-	dump(@FILE)
-	dump(cfolder)
-	dump(so_ext)
-	dump(library_file_name)
+	// dump(os.executable())
+	// dump(@FILE)
+	// dump(cfolder)
+	// dump(so_ext)
+	// dump(library_file_name)
 }
 
 fn test_can_compile_library() {
 	os.chdir(cfolder)
-	os.rm(library_file_name) or { }
-	res := v_compile('-d no_backtrace -o library -shared modules/library/library.v')
-	dump(res)
+	os.rm(library_file_name) or {}
+	v_compile('-d no_backtrace -o library -shared modules/library/library.v')
 	assert os.is_file(library_file_name)
 }
 
@@ -32,21 +31,26 @@ fn test_can_compile_main_program() {
 	os.chdir(cfolder)
 	assert os.is_file(library_file_name)
 	result := v_compile('run use.v')
-	dump(result)
+	// dump(result)
 	assert result.output.contains('res: 4')
-	os.rm(library_file_name) or { }
+	os.rm(library_file_name) or {}
+}
+
+fn test_can_compile_and_use_library_with_skip_unused() {
+	os.chdir(cfolder)
+	os.rm(library_file_name) or {}
+	v_compile('-skip-unused -d no_backtrace -o library -shared modules/library/library.v')
+	assert os.is_file(library_file_name)
+	result := v_compile('run use.v')
+	assert result.output.contains('res: 4')
+	os.rm(library_file_name) or {}
 }
 
 fn v_compile(vopts string) os.Result {
 	cmd := '"$vexe" -showcc $vopts'
-	dump(cmd)
+	// dump(cmd)
 	res := os.execute_or_panic(cmd)
-	dump(res)
-	// assert res.exit_code == 0
-	$if windows {
-		os.system('dir $cfolder /a')
-	} $else {
-		os.system('ls -al $cfolder')
-	}
+	// dump(res)
+	assert res.exit_code == 0
 	return res
 }

vlib/v/markused/markused.v

@@ -143,6 +143,10 @@ pub fn mark_used(mut table ast.Table, pref &pref.Preferences, ast_files []ast.Fi
 				continue
 			}
 		}
+		if mfn.is_pub && pref.is_shared {
+			all_fn_root_names << k
+			continue
+		}
 	}
 	if pref.is_debug {
 		all_fn_root_names << 'panic_debug'