Below are the reasoning why certain checks are (currently) disabled for out code base
We do not perform static analysis of the source of the external libraries. simplecpp has its own CI with a clang-tidy workflow.
abseil-*
altera-*
android-*
boost-*
darwin-*
fuchsia-*
linuxkernel-*
llvm-*
llvmlibc-*
mpi-*
objc-*
openmp-*
zircon-*
These are disabled since the platforms/libraries in question are not targeted by us.
cert-*
cppcoreguidelines-*
google-*
hicpp-*
These are coding guidelines we do not follow. Some of the checks might be explicitly enabled though.
readability-braces-around-statements
readability-isolate-declaration
modernize-use-trailing-return-type
readability-uppercase-literal-suffix
readability-identifier-length
These do not reflect the style we are (currently) enforcing.
readability-function-size
readability-function-cognitive-complexity
We are not interested in the size/complexity of a function.
readability-magic-numbers
These do not (always) increase readability.
bugprone-macro-parentheses
To be documented.
readability-implicit-bool-conversion
This does not appear to be useful as it is reported on very common code.
bugprone-narrowing-conversions
performance-no-automatic-move
It was decided not to apply these.
modernize-loop-convert
These might change the behavior of code which might not be intended (need to file an upstream issue)
modernize-raw-string-literal
This leads to a mismatch of raw string literals and regular ones and does reduce the readability.
-clang-analyzer-*
Disabled because of false positives (need to file upstream bug reports). The checks are also quite time consuming.
misc-non-private-member-variables-in-classes
We intentionally use this.
misc-no-recursion
Leads to lots of "false positives". This seem to enforce a coding guidelines of certain codebases.
bugprone-easily-swappable-parameters
This produces a lot of noise and they are not fixable that easily.
readability-container-data-pointer
Disable because of false positives and inconsistent warnings (need to file an upstream bug report).
misc-const-correctness
Work in progress.
bugprone-assignment-in-if-condition
Is reported for valid patterns we are using.
readability-suspicious-call-argument
Produces a lot of false positives since it is too vague in its analysis.
performance-inefficient-string-concatenation
Produces warnings which might be considered false positives starting with C++11 - see llvm/llvm-project#54526.
modernize-avoid-c-arrays
Produces warnings when const char[] is being used which is quite common in our code. Does not make sense to enable before C++17 when std::string_view becomes available.
Also reports a false positive about templates which deduce the array length: llvm/llvm-project#60053.
misc-include-cleaner
We run this separately via clang-include-cleaner in the iwyu.yml workflow as the findings of the include checkers still need to be reviewed manually before applying them.
bugprone-branch-clone
modernize-return-braced-init-list
misc-throw-by-value-catch-by-reference
bugprone-signed-char-misuse
concurrency-mt-unsafe
misc-use-anonymous-namespace
performance-avoid-endl
bugprone-switch-missing-default-case
bugprone-empty-catch
readability-avoid-nested-conditional-operator
modernize-use-designated-initializers
readability-enum-initial-value
To be evaluated (need to remove exclusion).
cppcoreguidelines-missing-std-forward
cppcoreguidelines-avoid-const-or-ref-data-members
cppcoreguidelines-macro-usage
cppcoreguidelines-pro-type-member-init
cppcoreguidelines-prefer-member-initializer
cppcoreguidelines-misleading-capture-default-by-value
bugprone-argument-comment.CommentBoolLiterals
cert-err33-c
google-readability-namespace-comments
cppcoreguidelines-special-member-functions
To be evaluated (need to enable explicitly).
modernize-type-traits
modernize-use-nodiscard
These apply to codebases which use later standards then C++11 (C++17 is used when building with Qt6) so we cannot simply apply them.
modernize-use-auto
This cannot be enabled as it might lead to changes in the constness of iterators - see llvm/llvm-project#84324.
portability-std-allocator-const
Only necessary for code which is exclusively compiled with libc++. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
modernize-deprecated-ios-base-aliases
Warns about aliases which are removed in C++20. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
bugprone-unchecked-optional-access
We are not using any optional implementation. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
modernize-replace-auto-ptr
Still available until C++17. It is unlikely such code will ever be introduced. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
readability-identifier-naming
We are currently using our own naming.json to enforce naming schemes. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
portability-simd-intrinsics
We are not using SIMD instructions and it suggests to use std::experiemental:: features which might not be commonly available. Also disabled for performance reasons - see llvm/llvm-project#57527 (comment).
modernize-macro-to-enum
It does not seem to produce any warnings for us (needs to be investigated) and it is one of the more expensive checks.
misc-unused-using-decls
This is the most expensive check for several files and it is providing much in terms of code quality. Reported upstream as llvm/llvm-project#72300.
readability-convert-member-functions-to-static
Disabled because of false positives with Qt slot methods (see llvm/llvm-project#57520).
readability-redundant-access-specifiers
Reports warning with the Qt <access-specifier> slots: syntax in class declarations - see llvm/llvm-project#60055.