fix #2928 (False positive (static variable misinterpreted as auto variable))

Makefile

@@ -16,9 +16,9 @@ ifeq ($(HAVE_RULES),yes)
     endif
 endif
 
-ifndef CXX
-    CXX=g++
-endif
+#ifndef CXX
+    CXX=clang++
+#endif
 
 ifndef PREFIX
     PREFIX=/usr

lib/checkautovariables.cpp

@@ -107,7 +107,7 @@ void CheckAutoVariables::autoVariables()
                 if (var1 && var1->isArgument() && Token::Match(var1->nameToken()->tokAt(-3), "%type% * *"))
                 {
                     const Variable * var2 = symbolDatabase->getVariableFromVarId(tok->tokAt(4)->varId());
-                    if (var2 && var2->isLocal() && var2->isArray())
+                    if (var2 && var2->isLocal() && var2->isArray() && !var2->isStatic())
                         errorAutoVariableAssignment(tok);
                 }
                 tok = tok->tokAt(4);

test/testautovariables.cpp

@@ -70,6 +70,7 @@ private:
         TEST_CASE(testautovar1);
         TEST_CASE(testautovar2);
         TEST_CASE(testautovar3); // ticket #2925
+        TEST_CASE(testautovar4); // ticket #2928
         TEST_CASE(testautovar_array1);
         TEST_CASE(testautovar_array2);
         TEST_CASE(testautovar_return1);
@@ -164,6 +165,16 @@ private:
         ASSERT_EQUALS("[test.cpp:3]: (error) Assigning address of local auto-variable to a function parameter.\n", errout.str());
     }
 
+    void testautovar4() // ticket #2928
+    {
+        check("void foo(int **p)\n"
+              "{\n"
+              "    static int x[100];\n"
+              "    *p = x;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void testautovar_array1()
     {
         check("void func1(int* arr[2])\n"