Fixed #5259 (Improve check: Uninitialized variable not reported when used in array initialization)

lib/checkuninitvar.cpp

@@ -973,6 +973,16 @@ bool CheckUninitVar::isVariableUsage(const Token *vartok, bool pointer, Alloc al
         }
     }
 
+    {
+        const Token *parent = vartok->astParent();
+        while (parent && parent->isCast())
+            parent = parent->astParent();
+        while (parent && parent->str() == ",")
+            parent = parent->astParent();
+        if (Token::simpleMatch(parent, "{"))
+            return true;
+    }
+
     if (Token::Match(vartok->previous(), "++|--|%cop%")) {
         if (mTokenizer->isCPP() && alloc == ARRAY && Token::Match(vartok->tokAt(-4), "& %var% =|( *"))
             return false;

test/testuninitvar.cpp

@@ -3978,6 +3978,12 @@ private:
                         "  if (2 < sizeof(*x)) {}\n"
                         "}");
         ASSERT_EQUALS("", errout.str());
+
+        valueFlowUninit("void foo() {\n" // #5259 - False negative
+                        "    int a;\n"
+                        "    int x[] = {a,2};\n"
+                        "}");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
     }
 
     void uninitvar_ipa() {