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

libcxx/src/.clang-tidy

@@ -1,4 +1,19 @@
 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.

libcxx/utils/ci/run-buildbot

@@ -328,6 +328,8 @@ 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