clang-tidy.yml: updated to Clang 21

.clang-tidy

@@ -49,6 +49,7 @@ Checks: >
         -readability-magic-numbers,
         -readability-redundant-inline-specifier,
         -readability-simplify-boolean-expr,
+        -readability-use-concise-preprocessor-directives,
         -readability-uppercase-literal-suffix,
         -performance-avoid-endl,
         -performance-enum-size,

.github/workflows/clang-tidy.yml

@@ -33,19 +33,19 @@ jobs:
         run: |
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh
-          sudo ./llvm.sh 20
-          sudo apt-get install clang-tidy-20
+          sudo ./llvm.sh 21
+          sudo apt-get install clang-tidy-21
 
       - name: Verify clang-tidy configuration
         run: |
-          clang-tidy-20 --verify-config
+          clang-tidy-21 --verify-config
 
       - name: Prepare CMake
         run: |
           cmake -S . -B cmake.output -Werror=dev --warn-uninitialized -DCMAKE_COMPILE_WARNING_AS_ERROR=On -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
         env:
-          CXX: clang-20
+          CXX: clang-21
 
       - name: Clang-Tidy
         run: |
-          run-clang-tidy-20 -q -j $(nproc) -p=cmake.output
+          run-clang-tidy-21 -q -j $(nproc) -p=cmake.output

CMakeLists.txt

@@ -49,16 +49,25 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     # no need for c++98 compatibility
     add_compile_options(-Wno-c++98-compat-pedantic)
     # these are not really fixable
-    add_compile_options(-Wno-exit-time-destructors -Wno-global-constructors -Wno-weak-vtables)
+    add_compile_options(-Wno-exit-time-destructors)
+    add_compile_options(-Wno-global-constructors)
+    add_compile_options(-Wno-weak-vtables)
     add_compile_options_safe(-Wno-unsafe-buffer-usage)
+    add_compile_options_safe(-Wno-nrvo)
     # we are not interested in these
-    add_compile_options(-Wno-multichar -Wno-four-char-constants)
+    add_compile_options(-Wno-multichar)
+    add_compile_options(-Wno-four-char-constants)
     # ignore C++11-specific warning
-    add_compile_options(-Wno-suggest-override -Wno-suggest-destructor-override)
+    add_compile_options(-Wno-suggest-override)
+    add_compile_options(-Wno-suggest-destructor-override)
     # contradicts -Wcovered-switch-default
     add_compile_options(-Wno-switch-default)
     # TODO: fix these?
-    add_compile_options(-Wno-padded -Wno-sign-conversion -Wno-implicit-int-conversion -Wno-shorten-64-to-32 -Wno-shadow-field-in-constructor)
+    add_compile_options(-Wno-padded)
+    add_compile_options(-Wno-sign-conversion)
+    add_compile_options(-Wno-implicit-int-conversion)
+    add_compile_options(-Wno-shorten-64-to-32)
+    add_compile_options(-Wno-shadow-field-in-constructor)
 
     if (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL 14 OR CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 14)
         # TODO: verify this regression still exists in clang-15

simplecpp.cpp

@@ -874,7 +874,7 @@ void simplecpp::TokenList::readfile(Stream &stream, const std::string &filename,
                 back()->setstr(currentToken);
                 location.adjust(currentToken);
                 if (currentToken.find_first_of("\r\n") == std::string::npos)
-                    location.col += 2 + 2 * delim.size();
+                    location.col += 2 + (2 * delim.size());
                 else
                     location.col += 1 + delim.size();
 
@@ -1329,6 +1329,7 @@ void simplecpp::TokenList::constFoldLogicalOp(Token *tok)
 void simplecpp::TokenList::constFoldQuestionOp(Token **tok1)
 {
     bool gotoTok1 = false;
+    // NOLINTNEXTLINE(misc-const-correctness) - technically correct but used to access non-const data
     for (Token *tok = *tok1; tok && tok->op != ')'; tok =  gotoTok1 ? *tok1 : tok->next) {
         gotoTok1 = false;
         if (tok->str() != "?")
@@ -1508,7 +1509,12 @@ namespace simplecpp {
         }
 
         Macro(const Macro &other) : nameTokDef(nullptr), files(other.files), tokenListDefine(other.files), valueDefinedInCode_(other.valueDefinedInCode_) {
-            *this = other;
+            // TODO: remove the try-catch - see #537
+            // avoid bugprone-exception-escape clang-tidy warning
+            try {
+                *this = other;
+            }
+            catch (const Error&) {} // NOLINT(bugprone-empty-catch)
         }
 
         ~Macro() {
@@ -1945,6 +1951,7 @@ namespace simplecpp {
                 }
             }
 
+            // NOLINTNEXTLINE(misc-const-correctness) - technically correct but used to access non-const data
             Token * const output_end_1 = output.back();
 
             const Token *valueToken2;
@@ -2250,7 +2257,7 @@ namespace simplecpp {
             const bool canBeConcatenatedStringOrChar = isStringLiteral_(A->str()) || isCharLiteral_(A->str());
             const bool unexpectedA = (!A->name && !A->number && !A->str().empty() && !canBeConcatenatedWithEqual && !canBeConcatenatedStringOrChar);
 
-            Token * const B = tok->next->next;
+            const Token * const B = tok->next->next;
             if (!B->name && !B->number && B->op && !B->isOneOf("#="))
                 throw invalidHashHash::unexpectedToken(tok->location, name(), B);
 
@@ -2528,11 +2535,11 @@ static void simplifySizeof(simplecpp::TokenList &expr, const std::map<std::strin
     for (simplecpp::Token *tok = expr.front(); tok; tok = tok->next) {
         if (tok->str() != "sizeof")
             continue;
-        simplecpp::Token *tok1 = tok->next;
+        const simplecpp::Token *tok1 = tok->next;
         if (!tok1) {
             throw std::runtime_error("missing sizeof argument");
         }
-        simplecpp::Token *tok2 = tok1->next;
+        const simplecpp::Token *tok2 = tok1->next;
         if (!tok2) {
             throw std::runtime_error("missing sizeof argument");
         }
@@ -2547,7 +2554,7 @@ static void simplifySizeof(simplecpp::TokenList &expr, const std::map<std::strin
         }
 
         std::string type;
-        for (simplecpp::Token *typeToken = tok1; typeToken != tok2; typeToken = typeToken->next) {
+        for (const simplecpp::Token *typeToken = tok1; typeToken != tok2; typeToken = typeToken->next) {
             if ((typeToken->str() == "unsigned" || typeToken->str() == "signed") && typeToken->next->name)
                 continue;
             if (typeToken->str() == "*" && type.find('*') != std::string::npos)
@@ -2598,11 +2605,11 @@ static void simplifyHasInclude(simplecpp::TokenList &expr, const simplecpp::DUI
     for (simplecpp::Token *tok = expr.front(); tok; tok = tok->next) {
         if (tok->str() != HAS_INCLUDE)
             continue;
-        simplecpp::Token *tok1 = tok->next;
+        const simplecpp::Token *tok1 = tok->next;
         if (!tok1) {
             throw std::runtime_error("missing __has_include argument");
         }
-        simplecpp::Token *tok2 = tok1->next;
+        const simplecpp::Token *tok2 = tok1->next;
         if (!tok2) {
             throw std::runtime_error("missing __has_include argument");
         }
@@ -2620,7 +2627,7 @@ static void simplifyHasInclude(simplecpp::TokenList &expr, const simplecpp::DUI
         const bool systemheader = (tok1 && tok1->op == '<');
         std::string header;
         if (systemheader) {
-            simplecpp::Token *tok3 = tok1->next;
+            const simplecpp::Token *tok3 = tok1->next;
             if (!tok3) {
                 throw std::runtime_error("missing __has_include closing angular bracket");
             }
@@ -2631,7 +2638,7 @@ static void simplifyHasInclude(simplecpp::TokenList &expr, const simplecpp::DUI
                 }
             }
 
-            for (simplecpp::Token *headerToken = tok1->next; headerToken != tok3; headerToken = headerToken->next)
+            for (const simplecpp::Token *headerToken = tok1->next; headerToken != tok3; headerToken = headerToken->next)
                 header += headerToken->str();
         } else {
             header = tok1->str().substr(1U, tok1->str().size() - 2U);

simplecpp.h

@@ -426,6 +426,7 @@ namespace simplecpp {
         std::pair<FileData *, bool> get(const std::string &sourcefile, const std::string &header, const DUI &dui, bool systemheader, std::vector<std::string> &filenames, OutputList *outputList);
 
         void insert(FileData data) {
+            // NOLINTNEXTLINE(misc-const-correctness) - FP
             FileData *const newdata = new FileData(std::move(data));
 
             mData.emplace_back(newdata);