Format string warnings: don't a.k.a. wchar_t with wchar_t.

This fixes the case where Clang would output:
 error: format specifies type 'wchar_t *' (aka 'wchar_t *')

ArgTypeResult::getRepresentativeTypeName needs to take into account
that wchar_t can be a built-in type (as opposed to in C, where it is a
typedef).

llvm-svn: 149387

2 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Analysis/FormatString.cpp b/clang/lib/Analysis/FormatString.cpp
index a0633c80d3c..30bfe4bf884 100644
--- a/clang/lib/Analysis/FormatString.cpp
+++ b/clang/lib/Analysis/FormatString.cpp
@@ -373,7 +373,7 @@ QualType ArgTypeResult::getRepresentativeType(ASTContext &C) const {
 
 std::string ArgTypeResult::getRepresentativeTypeName(ASTContext &C) const {
   std::string S = getRepresentativeType(C).getAsString();
-  if (Name)
+  if (Name && S != Name)
     return std::string("'") + Name + "' (aka '" + S + "')";
   return std::string("'") + S + "'";
 }
diff --git a/clang/test/SemaCXX/format-strings.cpp b/clang/test/SemaCXX/format-strings.cpp
index 2011a71b481..4f5b74d170d 100644
--- a/clang/test/SemaCXX/format-strings.cpp
+++ b/clang/test/SemaCXX/format-strings.cpp
@@ -13,3 +13,7 @@ void f(char **sp, float *fp) {
   printf("%a", 1.0);
   scanf("%afoobar", fp);
 }
+
+void g() {
+  printf("%ls", "foo"); // expected-warning{{format specifies type 'wchar_t *' but the argument has type 'const char *'}}
+}