Add clang-tidy to CI

.github/workflows/test.yaml

@@ -47,11 +47,23 @@ jobs:
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/[email protected]
     with:
-      build_type: pull-request
+      build_type: nightly
+      branch: ${{ inputs.branch }}
+      date: ${{ inputs.date }}
+      sha: ${{ inputs.sha }}
       # Use the wheel container so we can skip conda solves and since our
       # primary static consumers (Spark) are not in conda anyway.
       container_image: "rapidsai/ci-wheel:latest"
       run_script: "ci/configure_cpp_static.sh"
+  clang-tidy:
+    secrets: inherit
+    uses: rapidsai/shared-workflows/.github/workflows/[email protected]
+    with:
+      build_type: nightly
+      branch: ${{ inputs.branch }}
+      date: ${{ inputs.date }}
+      sha: ${{ inputs.sha }}
+      run_script: "ci/clang_tidy.sh"
   conda-python-cudf-tests:
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/[email protected]

ci/clang_tidy.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Copyright (c) 2024, NVIDIA CORPORATION.
+
+set -euo pipefail
+
+rapids-logger "Create clang-tidy conda environment"
+. /opt/conda/etc/profile.d/conda.sh
+
+ENV_YAML_DIR="$(mktemp -d)"
+
+rapids-dependency-file-generator \
+  --output conda \
+  --file-key clang_tidy \
+  --matrix "cuda=${RAPIDS_CUDA_VERSION%.*};arch=$(arch);py=${RAPIDS_PY_VERSION}" | tee "${ENV_YAML_DIR}/env.yaml"
+
+rapids-mamba-retry env create --yes -f "${ENV_YAML_DIR}/env.yaml" -n clang_tidy
+
+# Temporarily allow unbound variables for conda activation.
+set +u
+conda activate clang_tidy
+set -u
+
+RAPIDS_VERSION_MAJOR_MINOR="$(rapids-version-major-minor)"
+
+source rapids-configure-sccache
+
+# Run the build via CMake, which will run clang-tidy when CUDF_CLANG_TIDY is enabled.
+cmake -S cpp -B cpp/build -DCMAKE_BUILD_TYPE=Release -DCUDF_CLANG_TIDY=ON -GNinja
+cmake --build cpp/build

cpp/.clang-tidy

@@ -39,7 +39,7 @@ Checks:
        -clang-analyzer-optin.core.EnumCastOutOfRange,
        -clang-analyzer-optin.cplusplus.UninitializedObject'
 
-WarningsAsErrors: ''
+WarningsAsErrors: '*'
 HeaderFilterRegex: '.*cudf/cpp/(src|include|tests).*'
 ExcludeHeaderFilterRegex: '.*(Message_generated.h|Schema_generated.h|brotli_dict.hpp|unbz2.hpp|cxxopts.hpp).*'
 FormatStyle:     none

cpp/CMakeLists.txt

@@ -88,6 +88,7 @@ option(
   ${DEFAULT_CUDF_BUILD_STREAMS_TEST_UTIL}
 )
 mark_as_advanced(CUDF_BUILD_STREAMS_TEST_UTIL)
+option(CUDF_CLANG_TIDY "Enable clang-tidy checking" OFF)
 
 message(VERBOSE "CUDF: Build with NVTX support: ${USE_NVTX}")
 message(VERBOSE "CUDF: Configure CMake to build tests: ${BUILD_TESTS}")
@@ -144,6 +145,58 @@ if(NOT CUDF_GENERATED_INCLUDE_DIR)
   set(CUDF_GENERATED_INCLUDE_DIR ${CUDF_BINARY_DIR})
 endif()
 
+# ##################################################################################################
+# * clang-tidy configuration ----------------------------------------------------------------------
+if(CUDF_CLANG_TIDY)
+  find_program(
+    CLANG_TIDY_EXE
+    NAMES "clang-tidy"
+    DOC "Path to clang-tidy executable" REQUIRED
+  )
+
+  execute_process(
+    COMMAND ${CLANG_TIDY_EXE} --version
+    OUTPUT_VARIABLE CLANG_TIDY_OUTPUT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  string(REGEX MATCH "LLVM version ([0-9]+\\.[0-9]+)\\.[0-9]+" LLVM_VERSION_MATCH
+               "${CLANG_TIDY_OUTPUT}"
+  )
+  # Discard the patch version and allow it to float. Empirically, results between patch versions are
+  # mostly stable, and looking at available packages on some package managers sometimes patch
+  # versions are skipped so we don't want to constrain to a patch version that the user can't
+  # install.
+  set(LLVM_VERSION "${CMAKE_MATCH_1}")
+  set(expected_clang_tidy_version 19.1)
+  if(NOT expected_clang_tidy_version VERSION_EQUAL LLVM_VERSION)
+    message(
+      FATAL_ERROR
+        "clang-tidy version ${expected_clang_tidy_version} is required, but found ${LLVM_VERSION}"
+    )
+  endif()
+endif()
+
+# Turn on the clang-tidy property for a target excluding the files specified in SKIPPED_FILES.
+function(enable_clang_tidy target)
+  set(_tidy_options)
+  set(_tidy_one_value)
+  set(_tidy_multi_value SKIPPED_FILES)
+  cmake_parse_arguments(
+    _TIDY "${_tidy_options}" "${_tidy_one_value}" "${_tidy_multi_value}" ${ARGN}
+  )
+
+  if(CUDF_CLANG_TIDY)
+    # clang will complain about unused link libraries on the compile line unless we specify
+    # -Qunused-arguments.
+    set_target_properties(
+      ${target} PROPERTIES CXX_CLANG_TIDY "${CLANG_TIDY_EXE};--extra-arg=-Qunused-arguments"
+    )
+    foreach(file IN LISTS _TIDY_SKIPPED_FILES)
+      set_source_files_properties(${file} PROPERTIES SKIP_LINTING ON)
+    endforeach()
+  endif()
+endfunction()
+
 # ##################################################################################################
 # * conda environment -----------------------------------------------------------------------------
 rapids_cmake_support_conda_env(conda_env MODIFY_PREFIX_PATH)
@@ -714,6 +767,7 @@ target_compile_options(
   cudf PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${CUDF_CXX_FLAGS}>"
                "$<$<COMPILE_LANGUAGE:CUDA>:${CUDF_CUDA_FLAGS}>"
 )
+enable_clang_tidy(cudf SKIPPED_FILES src/io/comp/cpu_unbz2.cpp src/io/comp/brotli_dict.cpp)
 
 if(CUDF_BUILD_STACKTRACE_DEBUG)
   # Remove any optimization level to avoid nvcc warning "incompatible redefinition for option