unittests: explicit stringify StringRefs for conversion

When clang is built outside of the LLVM tree (against a corresponding version),
there is no definition providing for operator<<(std::ostream &, StringRef) which
is required for the assertion routines in google-test tests.  Avoid the
compilation failure by explicitly stringifying the StringRef prior to use.

llvm-svn: 200096

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/unittests/Tooling/CompilationDatabaseTest.cpp b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
index c575dff209a..4920d6d66bb 100644
--- a/clang/unittests/Tooling/CompilationDatabaseTest.cpp
+++ b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
@@ -24,7 +24,7 @@ static void expectFailure(StringRef JSONDatabase, StringRef Explanation) {
   std::string ErrorMessage;
   EXPECT_EQ(NULL, JSONCompilationDatabase::loadFromBuffer(JSONDatabase,
                                                           ErrorMessage))
-    << "Expected an error because of: " << Explanation;
+    << "Expected an error because of: " << Explanation.str();
 }
 
 TEST(JSONCompilationDatabase, ErrsOnInvalidFormat) {