Merge pull request #184 from felipensp/uninitialized_var_typeof

- Fixed false positive when using typeof/__alignof__

lib/checkuninitvar.cpp

@@ -1603,6 +1603,10 @@ bool CheckUninitVar::isVariableUsage(const Token *vartok, bool pointer, bool cpp
     if (vartok->previous()->str() == "return")
         return true;
 
+    // Passing variable to typeof/__alignof__
+    if (Token::Match(vartok->tokAt(-3), "typeof|__alignof__ ( * %var%"))
+        return false;
+
     // Passing variable to function..
     if (Token::Match(vartok->previous(), "[(,] %var% [,)]") || Token::Match(vartok->tokAt(-2), "[(,] & %var% [,)]")) {
         const bool address(vartok->previous()->str() == "&");

test/testuninitvar.cpp

@@ -1963,6 +1963,12 @@ private:
                        "    TYPEOF(s->status);\n"
                        "}");
         ASSERT_EQUALS("", errout.str());
+
+        checkUninitVar("void f() {\n"
+                       "    #define w(x) ({ x z;  (x*)z; })\n"
+                       "    int *n = w(typeof(*n));\n"
+                       "}");
+        ASSERT_EQUALS("", errout.str());
     }