[libc++] run clang-tidy on src/ in the CI

[philnik777]

This adds a new test to run clang-tidy on the src/ directory and temporarily disables and clang-tidy checks that currently fail. They will be enabled in follow-up patches.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Nikolas Klauser (philnik777)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/121198.diff

2 Files Affected:

• (modified) libcxx/src/.clang-tidy (+15-1)
• (modified) libcxx/utils/ci/run-buildbot (+3)

diff --git a/libcxx/src/.clang-tidy b/libcxx/src/.clang-tidy
index ec8f2e0a76a3c4..3d5493d965558e 100644
--- a/libcxx/src/.clang-tidy
+++ b/libcxx/src/.clang-tidy
@@ -1,4 +1,18 @@
 InheritParentConfig: true
 
 Checks: >
-  -readability-identifier-naming
+  -clang-analyzer-*,
+
+  -llvm-include-order,
+
+  -modernize-loop-convert,
+  -modernize-use-equals-delete,
+  -modernize-use-nullptr,
+  -modernize-use-override,
+
+  -readability-identifier-naming,
+  -readability-function-cognitive-complexity,
+  -readability-function-size,
+  -readability-simplify-boolean-expr,
+
+# TODO: Consider enabling clang-analyzer. Without the checks clang-tidy runs 18x faster on my system.
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
index f1ede6474eb9ee..4070b7f9211963 100755
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -144,6 +144,7 @@ function generate-cmake() {
     generate-cmake-base \
           -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
           -DLIBCXX_CXX_ABI=libcxxabi \
+          -DCMAKE_EXPORT_COMPILE_COMMANDS=On \
           "${@}"
 }
 
@@ -328,6 +329,8 @@ generic-cxx26)
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx26.cmake"
     check-runtimes
     check-abi-list
+    python3 $MONOREPO_ROOT/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py \
+        -clang-tidy-binary clang-tidy-20 -warnings-as-errors \* -source-filter ".*libcxx/src.*" -p "${BUILD_DIR}"
 ;;
 #
 # Other compiler support

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