Clang tidy separate ci job

.clang-tidy

@@ -0,0 +1,20 @@
+---
+# See https://clang.llvm.org/extra/clang-tidy/index.html
+# First disable all default checks (with -*)
+Checks: '-*,
+          modernize-use-nodiscard'
+# TODO(bavulapati): iterate through the rules and enable them incrementally inorder to send smaller PRs
+          # bugprone-*,-bugprone-branch-clone,-bugprone-easily-swappable-parameters,-bugprone-empty-catch,
+          # clang-analyzer-*,
+          # clang-diagnostic-*,
+          # modernize-*,
+          # concurrency-*,
+          # cppcoreguidelines-*,-cppcoreguidelines-rvalue-reference-param-not-moved,
+          # performance-*,-performance-enum-size,
+          # portability-*,
+          # objc-*,
+          # misc-*,-misc-no-recursion,-misc-unused-parameters,-misc-const-correctness'
+WarningsAsErrors: '*'
+FormatStyle: none
+UseColor: true
+SystemHeaders: false

.github/workflows/ci.yml

@@ -161,3 +161,24 @@ jobs:
           alert-threshold: '5%'
           comment-always: true
           fail-on-alert: false
+
+  clang-tidy:
+    runs-on: ubuntu-latest
+    env:
+      CC: clang
+      CXX: clang++
+    steps:
+      - uses: actions/checkout@v4
+      - run: cmake --version
+      - name: Install llvm
+        run: sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
+      - run: >
+          cmake -S . -B ./build
+          -DCMAKE_BUILD_TYPE:STRING=Release
+          -DSOURCEMETA_CORE_TESTS:BOOL=OFF
+          -DSOURCEMETA_CORE_BENCHMARK:BOOL=OFF
+          -DSOURCEMETA_CORE_DOCS:BOOL=OFF
+          -DBUILD_SHARED_LIBS:BOOL=OFF
+          -DCMAKE_COMPILE_WARNING_AS_ERROR:BOOL=ON
+          -DSOURCEMETA_CORE_CLANG_TIDY:BOOL=ON
+      - run: cmake --build ./build --config Release

CMakeLists.txt

@@ -24,6 +24,7 @@ option(SOURCEMETA_CORE_CONTRIB_ZLIB "Build the ZLIB library for downstream consu
 option(SOURCEMETA_CORE_CONTRIB_BEARSSL "Build the BearSSL library for downstream consumers" OFF)
 option(SOURCEMETA_CORE_CONTRIB_GOOGLETEST "Build the GoogleTest library for downstream consumers" OFF)
 option(SOURCEMETA_CORE_CONTRIB_GOOGLEBENCHMARK "Build the GoogleBenchmark library for downstream consumers" OFF)
+option(SOURCEMETA_CORE_CLANG_TIDY "Run clang-tidy checks" OFF)
 
 include(Sourcemeta)
 
@@ -32,6 +33,10 @@ if(PROJECT_IS_TOP_LEVEL)
   sourcemeta_enable_simd()
 endif()
 
+if(SOURCEMETA_CORE_CLANG_TIDY)
+  sourcemeta_enable_clang_tidy()
+endif()
+
 # TODO: Turn this into a re-usable utility CMake function
 if(SOURCEMETA_CORE_INSTALL)
   include(GNUInstallDirs)
@@ -115,9 +120,10 @@ if(PROJECT_IS_TOP_LEVEL)
     src/*.h src/*.cc
     benchmark/*.h benchmark/*.cc
     test/*.h test/*.cc)
-  sourcemeta_target_clang_tidy(SOURCES src/*.cc)
 endif()
 
+sourcemeta_disable_clang_tidy()
+
 # Testing
 
 if(SOURCEMETA_CORE_CONTRIB_GOOGLETEST OR SOURCEMETA_CORE_TESTS)

Makefile

@@ -25,9 +25,6 @@ compile: .always
 	$(CMAKE) --install ./build --prefix ./build/dist --config $(PRESET) --verbose \
 		--component sourcemeta_core_dev
 
-lint: .always
-	$(CMAKE) --build ./build --config $(PRESET) --target clang_tidy
-
 test: .always
 	$(CMAKE) -E env UBSAN_OPTIONS=print_stacktrace=1 \
 		$(CTEST) --test-dir ./build --build-config $(PRESET) \

cmake/common/targets/clang-tidy.cmake

@@ -1,130 +1,8 @@
-function(sourcemeta_target_clang_tidy_attempt_install)
-  cmake_parse_arguments(SOURCEMETA_TARGET_CLANG_TIDY_ATTEMPT_INSTALL "" "OUTPUT_DIRECTORY" "" ${ARGN})
-  if(NOT SOURCEMETA_TARGET_CLANG_TIDY_ATTEMPT_INSTALL_OUTPUT_DIRECTORY)
-    message(FATAL_ERROR "You must pass the output directory in the OUTPUT_DIRECTORY option")
-  endif()
-
-  # See https://pypi.org/project/clang-tidy/
-  set(CLANG_TIDY_BINARY_VERSION "20.1.0")
-  set(CLANG_TIDY_BINARY_Windows_AMD64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-win_amd64.whl")
-  set(CLANG_TIDY_BINARY_MSYS_x86_64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-win_amd64.whl")
-  set(CLANG_TIDY_BINARY_Darwin_arm64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-macosx_11_0_arm64.whl")
-  set(CLANG_TIDY_BINARY_Darwin_x86_64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-macosx_10_9_x86_64.whl")
-  set(CLANG_TIDY_BINARY_Linux_aarch64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl")
-  set(CLANG_TIDY_BINARY_Linux_x86_64 "clang_tidy-${CLANG_TIDY_BINARY_VERSION}-py2.py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl")
-  set(CLANG_TIDY_BINARY_CHECKSUM_Windows_AMD64 "02/f0/dd985d9d9b76f8c39f1995aa475d8d5aabbea0d3e0cf498df44dc7bf1cb0")
-  set(CLANG_TIDY_BINARY_CHECKSUM_MSYS_x86_64 "02/f0/dd985d9d9b76f8c39f1995aa475d8d5aabbea0d3e0cf498df44dc7bf1cb0")
-  set(CLANG_TIDY_BINARY_CHECKSUM_Darwin_arm64 "95/02/838baf08764b08327322096bda55e8d1e2344e4a13b9308e5642cfaafd8e")
-  set(CLANG_TIDY_BINARY_CHECKSUM_Darwin_x86_64 "6d/5b/dcfc84b895d8544e00186738ca85132bbd14db4d11dbe39502630ece5391")
-  set(CLANG_TIDY_BINARY_CHECKSUM_Linux_aarch64 "be/61/9e1a0797639e81c41d38d7b8b2508a9be4b05b9a23baa9d64e7284d07238")
-  set(CLANG_TIDY_BINARY_CHECKSUM_Linux_x86_64 "52/76/42c61be1c1fdf8bacdbb265f0cd3e11321fee7362f91fa840717a6a41ad6")
-  set(CLANG_TIDY_BINARY_NAME_Windows_AMD64 "clang-tidy.exe")
-  set(CLANG_TIDY_BINARY_NAME_MSYS_x86_64 "clang-tidy.exe")
-  set(CLANG_TIDY_BINARY_NAME_Darwin_arm64 "clang-tidy")
-  set(CLANG_TIDY_BINARY_NAME_Darwin_x86_64 "clang-tidy")
-  set(CLANG_TIDY_BINARY_NAME_Linux_aarch64 "clang-tidy")
-  set(CLANG_TIDY_BINARY_NAME_Linux_x86_64 "clang-tidy")
-
-  # Determine the pre-built binary URL
-  string(REPLACE "." "_" CLANG_TIDY_BINARY_SYSTEM "${CMAKE_SYSTEM_NAME}")
-  string(REPLACE "." "_" CLANG_TIDY_BINARY_ARCH "${CMAKE_SYSTEM_PROCESSOR}")
-  set(CLANG_TIDY_BINARY_URL_VAR "CLANG_TIDY_BINARY_${CLANG_TIDY_BINARY_SYSTEM}_${CLANG_TIDY_BINARY_ARCH}")
-  set(CLANG_TIDY_BINARY_CHECKSUM_VAR "CLANG_TIDY_BINARY_CHECKSUM_${CLANG_TIDY_BINARY_SYSTEM}_${CLANG_TIDY_BINARY_ARCH}")
-  set(CLANG_TIDY_BINARY_NAME_VAR "CLANG_TIDY_BINARY_NAME_${CLANG_TIDY_BINARY_SYSTEM}_${CLANG_TIDY_BINARY_ARCH}")
-  if(NOT DEFINED ${CLANG_TIDY_BINARY_URL_VAR} OR "${${CLANG_TIDY_BINARY_URL_VAR}}" STREQUAL "")
-    message(WARNING "Skipping `clang-tidy` download. No known pre-build binary URL")
-    return()
-  elseif(NOT DEFINED ${CLANG_TIDY_BINARY_CHECKSUM_VAR} OR "${${CLANG_TIDY_BINARY_CHECKSUM_VAR}}" STREQUAL "")
-    message(FATAL_ERROR "No known `clang-tidy` pre-build binary checksum")
-  elseif(NOT DEFINED ${CLANG_TIDY_BINARY_NAME_VAR} OR "${${CLANG_TIDY_BINARY_NAME_VAR}}" STREQUAL "")
-    message(FATAL_ERROR "No known `clang-tidy` pre-build binary name")
-  endif()
-  set(CLANG_TIDY_BINARY_URL "https://files.pythonhosted.org/packages/${${CLANG_TIDY_BINARY_CHECKSUM_VAR}}/${${CLANG_TIDY_BINARY_URL_VAR}}")
-
-  # Download and extract the pre-built binary ZIP if needed
-  set(CLANG_TIDY_BINARY_NAME "${${CLANG_TIDY_BINARY_NAME_VAR}}")
-  set(CLANG_TIDY_BINARY_OUTPUT "${SOURCEMETA_TARGET_CLANG_TIDY_ATTEMPT_INSTALL_OUTPUT_DIRECTORY}/${CLANG_TIDY_BINARY_NAME}")
-  if(EXISTS "${CLANG_TIDY_BINARY_OUTPUT}")
-    message(STATUS "Found existing `clang-tidy` pre-built binary at ${CLANG_TIDY_BINARY_OUTPUT}")
-    return()
-  endif()
-  set(CLANG_TIDY_BINARY_DOWNLOAD_DIR "${CMAKE_CURRENT_BINARY_DIR}/clang-tidy")
-  file(REMOVE_RECURSE "${CLANG_TIDY_BINARY_DOWNLOAD_DIR}")
-  file(MAKE_DIRECTORY "${CLANG_TIDY_BINARY_DOWNLOAD_DIR}")
-  set(CLANG_TIDY_BINARY_WHEEL "${CLANG_TIDY_BINARY_DOWNLOAD_DIR}/clang-tidy.whl")
-  message(STATUS "Downloading `clang-tidy` pre-built binary from ${CLANG_TIDY_BINARY_URL}")
-  file(DOWNLOAD "${CLANG_TIDY_BINARY_URL}" "${CLANG_TIDY_BINARY_WHEEL}"
-    STATUS CLANG_TIDY_BINARY_DOWNLOAD_STATUS SHOW_PROGRESS TLS_VERIFY ON
-    LOG CLANG_TIDY_BINARY_DOWNLOAD_LOG)
-  list(GET CLANG_TIDY_BINARY_DOWNLOAD_STATUS 0 _code)
-  if(NOT _code EQUAL 0)
-    message(WARNING "Failed to download the `clang-tidy` pre-built binary")
-    message(WARNING "${CLANG_TIDY_BINARY_DOWNLOAD_LOG}")
-    file(REMOVE_RECURSE "${CLANG_TIDY_BINARY_DOWNLOAD_DIR}")
-    return()
-  endif()
-  set(CLANG_TIDY_BINARY_EXTRACT_DIR "${CLANG_TIDY_BINARY_DOWNLOAD_DIR}/extracted")
-  file(MAKE_DIRECTORY "${CLANG_TIDY_BINARY_EXTRACT_DIR}")
-  file(ARCHIVE_EXTRACT INPUT "${CLANG_TIDY_BINARY_WHEEL}" DESTINATION "${CLANG_TIDY_BINARY_EXTRACT_DIR}")
-
-  # Install the binary
-  file(MAKE_DIRECTORY "${SOURCEMETA_TARGET_CLANG_TIDY_ATTEMPT_INSTALL_OUTPUT_DIRECTORY}")
-  file(COPY "${CLANG_TIDY_BINARY_EXTRACT_DIR}/clang_tidy/data/bin/${CLANG_TIDY_BINARY_NAME}"
-       DESTINATION "${SOURCEMETA_TARGET_CLANG_TIDY_ATTEMPT_INSTALL_OUTPUT_DIRECTORY}")
-  file(CHMOD "${CLANG_TIDY_BINARY_OUTPUT}" PERMISSIONS
-       OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
-  message(STATUS "Installed `clang-tidy` pre-built binary to ${CLANG_TIDY_BINARY_OUTPUT}")
+function(sourcemeta_enable_clang_tidy)
+  find_program(CLANG_TIDY_BIN NAMES clang-tidy)
+  set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_BIN};--config-file=${CMAKE_CURRENT_SOURCE_DIR}/.clang-tidy;-header-filter=${CMAKE_CURRENT_SOURCE_DIR}/src/*" PARENT_SCOPE)
 endfunction()
 
-function(sourcemeta_target_clang_tidy)
-  cmake_parse_arguments(SOURCEMETA_TARGET_CLANG_TIDY "REQUIRED" "" "SOURCES" ${ARGN})
-  sourcemeta_target_clang_tidy_attempt_install(OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
-
-  if(SOURCEMETA_TARGET_CLANG_TIDY_REQUIRED)
-    find_program(CLANG_TIDY_BIN NAMES clang-tidy NO_DEFAULT_PATH
-      PATHS "${CMAKE_CURRENT_BINARY_DIR}/bin")
-    if(NOT CLANG_TIDY_BIN)
-      find_program(CLANG_TIDY_BIN NAMES clang-tidy REQUIRED)
-    endif()
-  else()
-    find_program(CLANG_TIDY_BIN NAMES clang-tidy NO_DEFAULT_PATH
-      PATHS "${CMAKE_CURRENT_BINARY_DIR}/bin")
-    if(NOT CLANG_TIDY_BIN)
-      find_program(CLANG_TIDY_BIN NAMES clang-tidy)
-    endif()
-  endif()
-
-
-  # This covers the empty list too
-  if(NOT SOURCEMETA_TARGET_CLANG_TIDY_SOURCES)
-    message(FATAL_ERROR "You must pass file globs to analyze in the SOURCES option")
-  endif()
-  file(GLOB_RECURSE SOURCEMETA_TARGET_CLANG_TIDY_FILES
-    ${SOURCEMETA_TARGET_CLANG_TIDY_SOURCES})
-
-  set(CLANG_TIDY_CONFIG "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/clang-tidy.config")
-
-  if(CMAKE_SYSTEM_NAME STREQUAL "MSYS")
-    # Because `clang-tidy` is typically a Windows `.exe`, transform the path accordingly
-    execute_process(COMMAND cygpath -w "${CLANG_TIDY_CONFIG}"
-      OUTPUT_VARIABLE CLANG_TIDY_CONFIG OUTPUT_STRIP_TRAILING_WHITESPACE)
-  endif()
-
-  if(CLANG_TIDY_BIN)
-    add_custom_target(clang_tidy
-      WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
-      VERBATIM
-      COMMAND "${CLANG_TIDY_BIN}" -p "${PROJECT_BINARY_DIR}"
-        --config-file "${CLANG_TIDY_CONFIG}"
-        ${SOURCEMETA_TARGET_CLANG_TIDY_FILES}
-        COMMENT "Analyzing sources using ClangTidy")
-  else()
-    add_custom_target(clang_tidy
-      WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
-      VERBATIM
-      COMMAND "${CMAKE_COMMAND}" -E echo "Could not locate ClangTidy"
-      COMMAND "${CMAKE_COMMAND}" -E false)
-  endif()
-
-  set_target_properties(clang_tidy PROPERTIES FOLDER "Linting")
+function(sourcemeta_disable_clang_tidy)
+  unset(CMAKE_CXX_CLANG_TIDY PARENT_SCOPE)
 endfunction()

src/core/json/include/sourcemeta/core/json_array.h

@@ -56,31 +56,39 @@ template <typename Value> class JSONArray {
   /// Get a mutable end iterator on the array
   auto end() noexcept -> iterator { return this->data.end(); }
   /// Get a constant begin iterator on the array
-  auto begin() const noexcept -> const_iterator { return this->data.begin(); }
+  [[nodiscard]] auto begin() const noexcept -> const_iterator {
+    return this->data.begin();
+  }
   /// Get a constant end iterator on the array
-  auto end() const noexcept -> const_iterator { return this->data.end(); }
+  [[nodiscard]] auto end() const noexcept -> const_iterator {
+    return this->data.end();
+  }
   /// Get a constant begin iterator on the array
-  auto cbegin() const noexcept -> const_iterator { return this->data.cbegin(); }
+  [[nodiscard]] auto cbegin() const noexcept -> const_iterator {
+    return this->data.cbegin();
+  }
   /// Get a constant end iterator on the array
-  auto cend() const noexcept -> const_iterator { return this->data.cend(); }
+  [[nodiscard]] auto cend() const noexcept -> const_iterator {
+    return this->data.cend();
+  }
   /// Get a mutable reverse begin iterator on the array
   auto rbegin() noexcept -> reverse_iterator { return this->data.rbegin(); }
   /// Get a mutable reverse end iterator on the array
   auto rend() noexcept -> reverse_iterator { return this->data.rend(); }
   /// Get a constant reverse begin iterator on the array
-  auto rbegin() const noexcept -> const_reverse_iterator {
+  [[nodiscard]] auto rbegin() const noexcept -> const_reverse_iterator {
     return this->data.rbegin();
   }
   /// Get a constant reverse end iterator on the array
-  auto rend() const noexcept -> const_reverse_iterator {
+  [[nodiscard]] auto rend() const noexcept -> const_reverse_iterator {
     return this->data.rend();
   }
   /// Get a constant reverse begin iterator on the array
-  auto crbegin() const noexcept -> const_reverse_iterator {
+  [[nodiscard]] auto crbegin() const noexcept -> const_reverse_iterator {
     return this->data.crbegin();
   }
   /// Get a constant reverse end iterator on the array
-  auto crend() const noexcept -> const_reverse_iterator {
+  [[nodiscard]] auto crend() const noexcept -> const_reverse_iterator {
     return this->data.crend();
   }
 

src/core/json/include/sourcemeta/core/json_hash.h

@@ -14,7 +14,7 @@ template <typename T> struct HashJSON {
     return value.fast_hash();
   }
 
-  inline auto is_perfect(const hash_type) const noexcept -> bool {
+  [[nodiscard]] inline auto is_perfect(const hash_type) const noexcept -> bool {
     return false;
   }
 };
@@ -45,7 +45,8 @@ template <typename T> struct PropertyHashJSON {
     }
   };
 
-  inline auto perfect(const T &value, const std::size_t size) const noexcept
+  [[nodiscard]] inline auto perfect(const T &value,
+                                    const std::size_t size) const noexcept
       -> hash_type {
     hash_type result;
     assert(!value.empty());
@@ -134,7 +135,8 @@ template <typename T> struct PropertyHashJSON {
     }
   }
 
-  inline auto is_perfect(const hash_type &hash) const noexcept -> bool {
+  [[nodiscard]] inline auto is_perfect(const hash_type &hash) const noexcept
+      -> bool {
     // If there is anything written past the first byte,
     // then it is a perfect hash
     return hash.a > 255;