Remove main function in some unittest.

paddle/math/tests/test_CpuGpuVector.cpp

@@ -84,10 +84,4 @@ int main(int argc, char** argv) {
   return ret;
 }
 
-#else
-
-int main(int argc, char const* argv[]) {
-    return 0;
-}
-
 #endif

paddle/math/tests/test_matrixCompare.cpp

@@ -1851,10 +1851,5 @@ int main(int argc, char** argv) {
   initMain(argc, argv);
   return RUN_ALL_TESTS();
 }
-#else
-
-int main(int argc, char const* argv[]) {
-    return 0;
-}
 
 #endif

paddle/math/tests/test_perturbation.cpp

@@ -249,15 +249,4 @@ TEST_F(PerturbationTest, scale_test) {
   }
 }
 
-int main(int argc, char** argv) {
-  testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
-
-#else
-
-int main(int argc, char const* argv[]) {
-    return 0;
-}
-
 #endif

paddle/math/tests/test_sparseMatrixCompare.cpp

@@ -178,10 +178,4 @@ int main(int argc, char** argv) {
   return ret;
 }
 
-#else
-
-int main(int argc, char const* argv[]) {
-    return 0;
-}
-
 #endif

paddle/utils/tests/test_StringUtils.cpp

@@ -22,8 +22,3 @@ TEST(StringUtil, to) {
   ASSERT_DEATH(paddle::str::to<double>("12.45x23"), ".*");
   ASSERT_DEATH(paddle::str::to<int>(""), ".*");
 }
-
-int main(int argc, char** argv) {
-  testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}