Fix #13218 FP duplicateExpression with nested defines (#6918)

Author: chrchr-github

Diff for: lib/astutils.cpp

@@ -1547,8 +1547,12 @@ bool compareTokenFlags(const Token* tok1, const Token* tok2, bool macro) {
     if (macro) {
         if (tok1->isExpandedMacro() != tok2->isExpandedMacro())
             return false;
-        if (tok1->isExpandedMacro() && tok1->getMacroName() != tok2->getMacroName())
-            return false;
+        if (tok1->isExpandedMacro()) { // both are macros
+            if (tok1->getMacroName() != tok2->getMacroName())
+                return false;
+            if (tok1->astParent() && tok2->astParent() && tok1->astParent()->isExpandedMacro() && tok1->astParent()->getMacroName() == tok2->astParent()->getMacroName())
+                return false;
+        }
         if (tok1->isTemplateArg() || tok2->isTemplateArg())
             return false;
     }

Diff for: test/cfg/bsd.c

@@ -32,15 +32,15 @@ void nullPointer_setlinebuf(FILE *stream)
 // #9323, #9331
 void verify_timercmp(struct timeval t)
 {
-    // cppcheck-suppress duplicateExpression
+    // TODO cppcheck-suppress duplicateExpression
     (void)timercmp(&t, &t, <);
-    // cppcheck-suppress duplicateExpression
+    // TODO cppcheck-suppress duplicateExpression
     (void)timercmp(&t, &t, <=);
     (void)timercmp(&t, &t, ==);
     (void)timercmp(&t, &t, !=);
-    // cppcheck-suppress duplicateExpression
+    // TODO cppcheck-suppress duplicateExpression
     (void)timercmp(&t, &t, >=);
-    // cppcheck-suppress duplicateExpression
+    // TODO cppcheck-suppress duplicateExpression
     (void)timercmp(&t, &t, >);
 }
 

Diff for: test/testother.cpp

@@ -177,6 +177,7 @@ class TestOther : public TestFixture {
         TEST_CASE(duplicateExpression15); // #10650
         TEST_CASE(duplicateExpression16); // #10569
         TEST_CASE(duplicateExpression17); // #12036
+        TEST_CASE(duplicateExpression18);
         TEST_CASE(duplicateExpressionLoop);
         TEST_CASE(duplicateValueTernary);
         TEST_CASE(duplicateExpressionTernary); // #6391
@@ -7492,6 +7493,24 @@ class TestOther : public TestFixture {
         ASSERT_EQUALS("", errout_str());
     }
 
+    void duplicateExpression18() {
+        checkP("#if defined(ABC)\n" // #13218
+               "#define MACRO1 (0x1)\n"
+               "#else\n"
+               "#define MACRO1 (0)\n"
+               "#endif\n"
+               "#if defined(XYZ)\n"
+               "#define MACRO2 (0x2)\n"
+               "#else\n"
+               "#define MACRO2 (0)\n"
+               "#endif\n"
+               "#define MACRO_ALL (MACRO1 | MACRO2)\n"
+               "void f() {\n"
+               "    if (MACRO_ALL == 0) {}\n"
+               "}\n");
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void duplicateExpressionLoop() {
         check("void f() {\n"
               "    int a = 1;\n"