fix test error

cmd/llcppcfg/llcppgcfg/cfg_test.go

@@ -333,6 +333,7 @@ func Test_parseCFlagsEntry(t *testing.T) {
 					{OFile: "cJSON_Utils.o", HFile: "cJSON_Utils.h", Deps: []string{"cJSON.h"}},
 					{OFile: "cJSON.o", HFile: "cJSON.h", Deps: []string{}},
 				},
+				InvalidObjFiles: []*ObjFile{},
 			},
 		},
 		{

cmd/llcppcfg/llcppgcfg/cfg_test_data/deps/case3/b.h

@@ -1 +1,2 @@
-#include "a.h"
+#include "a.h"
+#include "c.h"

cmd/llcppcfg/llcppgcfg/cfg_test_data/deps/case3/c.h

@@ -0,0 +1 @@
+#include "b.h"

cmd/llcppcfg/llcppgcfg/types.go

@@ -108,7 +108,7 @@ func (c *CflagEntry) IsEmpty() bool {
 	if len(c.Include) == 0 {
 		return true
 	}
-	if len(c.ObjFiles) == 0 {
+	if len(c.ObjFiles) == 0 && len(c.InvalidObjFiles) == 0 {
 		return true
 	}
 	return false

cmd/llcppcfg/llcppgcfg/types_test.go

@@ -271,6 +271,8 @@ func TestIncludeList_AddCflagEntry(t *testing.T) {
 	_, inc := newCflags("cfg_test_data/same_rel")
 	inc0 := filepath.Join(inc, "libcjson/include")
 	inc1 := filepath.Join(inc, "stdcjson/include")
+	_, depsInc := newCflags("cfg_test_data/deps")
+	case3Inc := filepath.Join(depsInc, "case3")
 	type fields struct {
 		include    []string
 		absPathMap map[string]struct{}
@@ -387,6 +389,29 @@ func TestIncludeList_AddCflagEntry(t *testing.T) {
 			},
 			[]string{},
 		},
+		{
+			"deps/case3",
+			fields{
+				make([]string, 0),
+				make(map[string]struct{}),
+				make(map[string]struct{}),
+			},
+			[]args{
+				{
+					0,
+					&CflagEntry{
+						Include:  case3Inc,
+						ObjFiles: []*ObjFile{},
+						InvalidObjFiles: []*ObjFile{
+							{OFile: "a.h", HFile: "a.h", Deps: []string{}},
+							{OFile: "b.h", HFile: "b.h", Deps: []string{}},
+							{OFile: "c.h", HFile: "c.h", Deps: []string{}},
+						},
+					},
+				},
+			},
+			[]string{},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {