Fix #12383: cppcheck build dir: changed line numbers in source file (#6505)

Author: olabetskyi

Diff for: lib/preprocessor.cpp

@@ -952,13 +952,19 @@ std::size_t Preprocessor::calculateHash(const simplecpp::TokenList &tokens1, con
 {
     std::string hashData = toolinfo;
     for (const simplecpp::Token *tok = tokens1.cfront(); tok; tok = tok->next) {
-        if (!tok->comment)
+        if (!tok->comment) {
             hashData += tok->str();
+            hashData += static_cast<char>(tok->location.line);
+            hashData += static_cast<char>(tok->location.col);
+        }
     }
     for (std::map<std::string, simplecpp::TokenList *>::const_iterator it = mTokenLists.cbegin(); it != mTokenLists.cend(); ++it) {
         for (const simplecpp::Token *tok = it->second->cfront(); tok; tok = tok->next) {
-            if (!tok->comment)
+            if (!tok->comment) {
                 hashData += tok->str();
+                hashData += static_cast<char>(tok->location.line);
+                hashData += static_cast<char>(tok->location.col);
+            }
         }
     }
     return (std::hash<std::string>{})(hashData);

Diff for: test/testpreprocessor.cpp

@@ -264,6 +264,8 @@ class TestPreprocessor : public TestFixture {
         TEST_CASE(testMissingIncludeCheckConfig);
 
         TEST_CASE(limitsDefines);
+
+        TEST_CASE(hashCalculation);
     }
 
     std::string getConfigsStr(const char filedata[], const char *arg = nullptr) {
@@ -284,6 +286,16 @@ class TestPreprocessor : public TestFixture {
         return ret;
     }
 
+    std::size_t getHash(const char filedata[]) {
+        Settings settings;
+        Preprocessor preprocessor(settings, *this);
+        std::vector<std::string> files;
+        std::istringstream istr(filedata);
+        simplecpp::TokenList tokens(istr,files);
+        tokens.removeComments();
+        return preprocessor.calculateHash(tokens, "");
+    }
+
     void Bug2190219() {
         const char filedata[] = "#ifdef __cplusplus\n"
                                 "cpp\n"
@@ -2510,6 +2522,20 @@ class TestPreprocessor : public TestFixture {
                       "if ( l > $2147483647 ) { }\n"
                       "}", actual);
     }
+
+    void hashCalculation() {
+        // #12383
+        const char code[] = "int a;";
+        const char code2[] = "int  a;"; // extra space
+        const char code3[] = "\n\nint a;"; // extra new line
+
+        ASSERT_EQUALS(getHash(code), getHash(code));
+        ASSERT_EQUALS(getHash(code2), getHash(code2));
+        ASSERT_EQUALS(getHash(code3), getHash(code3));
+        ASSERT(getHash(code) != getHash(code2));
+        ASSERT(getHash(code) != getHash(code3));
+        ASSERT(getHash(code2) != getHash(code3));
+    }
 };
 
 REGISTER_TEST(TestPreprocessor)