fixed #13246/#13247 - unused function check did not store file location in build dir (#6937)

Author: firewave

Diff for: lib/checkunusedfunctions.cpp

@@ -387,14 +387,15 @@ void CheckUnusedFunctions::unusedFunctionError(ErrorLogger& errorLogger,
 }
 
 CheckUnusedFunctions::FunctionDecl::FunctionDecl(const Function *f)
-    : functionName(f->name()), lineNumber(f->token->linenr())
+    : functionName(f->name()), fileName(f->token->fileName()), lineNumber(f->token->linenr())
 {}
 
 std::string CheckUnusedFunctions::analyzerInfo() const
 {
     std::ostringstream ret;
     for (const FunctionDecl &functionDecl : mFunctionDecl) {
         ret << "    <functiondecl"
+            << " file=\"" << ErrorLogger::toxml(functionDecl.fileName) << '\"'
             << " functionName=\"" << ErrorLogger::toxml(functionDecl.functionName) << '\"'
             << " lineNumber=\"" << functionDecl.lineNumber << "\"/>\n";
     }
@@ -458,8 +459,9 @@ void CheckUnusedFunctions::analyseWholeProgram(const Settings &settings, ErrorLo
                 if (std::strcmp(name,"functiondecl") == 0) {
                     const char* lineNumber = e2->Attribute("lineNumber");
                     if (lineNumber) {
+                        const char* file = e2->Attribute("file");
                         // cppcheck-suppress templateInstantiation - TODO: fix this - see #11631
-                        decls[functionName] = Location(sourcefile, strToInt<int>(lineNumber));
+                        decls[functionName] = Location(file ? file : sourcefile, strToInt<int>(lineNumber));
                     }
                 }
             }

Diff for: lib/checkunusedfunctions.h

@@ -84,6 +84,7 @@ class CPPCHECKLIB CheckUnusedFunctions {
     public:
         explicit FunctionDecl(const Function *f);
         std::string functionName;
+        std::string fileName;
         unsigned int lineNumber;
     };
     std::list<FunctionDecl> mFunctionDecl;

Diff for: lib/token.cpp

@@ -2662,3 +2662,7 @@ bool Token::isC() const
 {
     return mTokensFrontBack.list.isC();
 }
+
+const std::string& Token::fileName() const {
+    return mTokensFrontBack.list.getFiles()[mImpl->mFileIndex];
+}

Diff for: lib/token.h

@@ -873,6 +873,8 @@ class CPPCHECKLIB Token {
     static int multiCompare(const Token *tok, const char *haystack, nonneg int varid);
 
 public:
+    const std::string& fileName() const;
+
     nonneg int fileIndex() const {
         return mImpl->mFileIndex;
     }

Diff for: test/cli/other_test.py

@@ -784,7 +784,7 @@ def test_addon_result(tmpdir):
 
 # TODO: test with -j2
 # #11483
-def test_unused_function_include(tmpdir):
+def __test_unused_function_include(tmpdir, extra_args):
     test_cpp_file = os.path.join(tmpdir, 'test.cpp')
     with open(test_cpp_file, 'wt') as f:
         f.write("""
@@ -802,12 +802,31 @@ class A {
                 };
                 """)
 
-    args = ['--enable=unusedFunction', '--inline-suppr', '--template=simple', '-j1', test_cpp_file]
+    args = [
+        '--enable=unusedFunction',
+        '--inline-suppr',
+        '--template=simple',
+        '-j1',
+        test_cpp_file
+    ]
+
+    args += extra_args
 
     _, _, stderr = cppcheck(args)
     assert stderr == "{}:4:0: style: The function 'f' is never used. [unusedFunction]\n".format(test_h_file)
 
 
+def test_unused_function_include(tmpdir):
+    __test_unused_function_include(tmpdir, [])
+
+
+# TODO: remove when we inject builddir
+def test_unused_function_include_builddir(tmpdir):
+    builddir = os.path.join(tmpdir, 'injected')
+    os.makedirs(builddir)
+    __test_unused_function_include(tmpdir, ['--cppcheck-build-dir={}'.format(builddir)])
+
+
 # TODO: test with all other types
 def test_showtime_top5_file(tmpdir):
     test_file = os.path.join(tmpdir, 'test.cpp')