Try to fix gcc and clang issues

googletest/include/gtest/internal/gtest-internal.h

@@ -1192,7 +1192,7 @@ class NativeArray {
 class AdditionalMessage
 {
 public:
-  AdditionalMessage(const std::string& message) : value(message) {}
+  AdditionalMessage(const char* message) : value(message) {}
   AdditionalMessage& operator=(const std::string& message) { value = message; return *this; }
   operator bool() const { return ::testing::internal::AlwaysTrue(); }
 

googletest/test/gtest_unittest.cc

@@ -3748,6 +3748,19 @@ TEST(ExpectTest, ASSERT_EQ_0) {
                        "  0\n  5.6");
 }
 
+TEST(AssertionTest, AdditionalMessage) {
+  ::testing::internal::AdditionalMessage m = "servus";
+  EXPECT_EQ(m.get(), "servus");
+
+  const char* cc = "hello";
+  m = cc;
+  EXPECT_EQ(m.get(), cc);
+
+  std::string s = "hi";
+  m = s;
+  EXPECT_EQ(m.get(), s);
+}
+
 // Tests ASSERT_NE.
 TEST(AssertionTest, ASSERT_NE) {
   ASSERT_NE(6, 7);