Fix FP constVariable with 2D array. (#4228)

Test case #8717 was actually a FP as well.

Author: chrchr-github

lib/checkother.cpp

@@ -1565,11 +1565,14 @@ void CheckOther::checkConstPointer()
             if (Token::simpleMatch(gparent, "return"))
                 continue;
             else if (Token::Match(gparent, "%assign%") && parent == gparent->astOperand2()) {
-                bool takingRef = false;
+                bool takingRef = false, nonConstPtrAssignment = false;
                 const Token *lhs = gparent->astOperand1();
                 if (lhs && lhs->variable() && lhs->variable()->isReference() && lhs->variable()->nameToken() == lhs)
                     takingRef = true;
-                if (!takingRef)
+                if (lhs && lhs->valueType() && lhs->valueType()->pointer && (lhs->valueType()->constness & 1) == 0 &&
+                    parent->valueType() && parent->valueType()->pointer)
+                    nonConstPtrAssignment = true;
+                if (!takingRef && !nonConstPtrAssignment)
                     continue;
             } else if (Token::simpleMatch(gparent, "[") && gparent->astOperand2() == parent)
                 continue;

test/testother.cpp

@@ -3230,6 +3230,14 @@ class TestOther : public TestFixture {
         ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'p' can be declared as pointer to const\n"
                       "[test.cpp:5]: (style) Variable 'p' can be declared as pointer to const\n",
                       errout.str());
+
+        check("void f() {\n"
+              "    char a[1][1];\n"
+              "    char* b[1];\n"
+              "    b[0] = a[0];\n"
+              "    **b = 0;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void switchRedundantAssignmentTest() {
@@ -9383,7 +9391,7 @@ class TestOther : public TestFixture {
               "    int local_argc = 0;\n"
               "    local_argv[local_argc++] = argv[0];\n"
               "}\n", "test.c");
-        ASSERT_EQUALS("[test.c:1]: (style) Parameter 'argv' can be declared as const array\n", errout.str());
+        ASSERT_EQUALS("", errout.str());
 
         check("void f() {\n"
               "  int x = 0;\n"