Fix a note without a SourceLocation.

#define TEST int y; int x = y;
void foo() {
  TEST
}

-Wuninitialized gives this warning:
invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
note: initialize the variable 'y' to silence this warning
1 warning generated.

The second note lacks filename, line number, and code snippet.  This change
will remove the fixit and only point to variable declaration.

invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
invalid-loc.cc:4:3: note: variable 'y' is declared here
  TEST
  ^
invalid-loc.cc:2:14: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
             ^
1 warning generated.

llvm-svn: 156045

clang/lib/Sema/AnalysisBasedWarnings.cpp

@@ -441,6 +441,11 @@ static bool SuggestInitializationFixit(Sema &S, const VarDecl *VD) {
   std::string Init = S.getFixItZeroInitializerForType(VariableTy);
   if (Init.empty())
     return false;
+
+  // Don't suggest a fixit inside macros.
+  if (VD->getLocEnd().isMacroID())
+    return false;
+
   SourceLocation Loc = S.PP.getLocForEndOfToken(VD->getLocEnd());
   
   S.Diag(Loc, diag::note_var_fixit_add_initialization) << VD->getDeclName()

clang/test/Sema/uninit-variables.c

@@ -424,3 +424,13 @@ void rdar9432305(float *P) {
   for (; i < 10000; ++i) // expected-warning {{variable 'i' is uninitialized when used here}}
     P[i] = 0.0f;
 }
+
+// Test that fixits are not emitted inside macros.
+#define UNINIT(T, x, y) T x; T y = x;
+#define ASSIGN(T, x, y) T y = x;
+void test54() {
+  UNINIT(int, a, b);  // expected-warning {{variable 'a' is uninitialized when used here}} \
+                      // expected-note {{variable 'a' is declared here}}
+  int c;  // expected-note {{initialize the variable 'c' to silence this warning}}
+  ASSIGN(int, c, d);  // expected-warning {{variable 'c' is uninitialized when used here}}
+}