add clang-tidy config

Author: MarkusB

.clang-tidy

@@ -0,0 +1,96 @@
+# Note, you can't have comments below in a '>' section, that's why here are the comments upfront.
+# -hicpp-deprecated-headers: unfortunately, should be restrictable to <>-includes
+# -readability-function-cognitive-complexity: goes bogus in gtests unfortunately
+# -cppcoreguidelines-pro-type-member-init: buggy unfortunately
+
+Checks: >
+  *,
+  -altera-id-dependent-backward-branch,
+  -altera-struct-pack-align,
+  -altera-unroll-loops,
+  -bugprone-easily-swappable-parameters,
+  -bugprone-empty-catch,
+  -cert-dcl16-c,
+  -cert-dcl21-cpp,
+  -clang-analyzer-deadcode,
+  -clang-diagnostic-c++17-attribute-extensions,
+  -clang-diagnostic-c++17-extensions,
+  -clang-diagnostic-error,
+  -clang-diagnostic-unused-macros,
+  -cppcoreguidelines-avoid-do-while,
+  -cppcoreguidelines-macro-usage,
+  -cppcoreguidelines-non-private-member-variables-in-classes,
+  -cppcoreguidelines-owning-memory,
+  -cppcoreguidelines-pro-type-member-init,
+  -cppcoreguidelines-pro-type-reinterpret-cast,
+  -cppcoreguidelines-special-member-functions,
+  -fuchsia-default-arguments-calls,
+  -fuchsia-default-arguments-declarations,
+  -fuchsia-overloaded-operator,
+  -fuchsia-trailing-return,
+  -google-explicit-constructor,
+  -google-readability-avoid-underscore-in-googletest-name,
+  -google-readability-braces-around-statements,
+  -hicpp-braces-around-statements,readability-braces-around-statements,
+  -hicpp-deprecated-headers,
+  -hicpp-explicit-conversions,
+  -hicpp-member-init,
+  -hicpp-named-parameter,
+  -hicpp-special-member-functions,
+  -hicpp-uppercase-literal-suffix,
+  -llvmlibc-callee-namespace,
+  -llvmlibc-implementation-in-namespace,
+  -llvmlibc-inline-function-decl,
+  -llvm-include-order,
+  -llvmlibc-restrict-system-libc-headers,
+  -llvm-header-guard,
+  -misc-no-recursion,
+  -misc-non-private-member-variables-in-classes,
+  -modernize-deprecated-headers,
+  -modernize-use-trailing-return-type,
+  -readability-braces-around-statements,
+  -readability-identifier-length,
+  readability-identifier-naming,
+  -readability-implicit-bool-conversion,
+  -readability-inconsistent-ifelse-braces,
+  -readability-function-cognitive-complexity,
+  -readability-named-parameter,
+  -readability-redundant-typename,
+  -readability-uppercase-literal-suffix
+
+WarningsAsErrors: "*"
+
+CheckOptions:
+  - { key: readability-identifier-naming.AggressiveDependentMemberLookup, value: true }
+  - { key: readability-identifier-naming.ClassCase,                       value: CamelCase }
+  - { key: readability-identifier-naming.ConceptCase,                     value: CamelCase }
+  - { key: readability-identifier-naming.EnumCase,                        value: CamelCase }
+  - { key: readability-identifier-naming.EnumConstantCase,                value: lower_case }
+  - { key: readability-identifier-naming.FunctionCase,                    value: lower_case }
+  - { key: readability-identifier-naming.FunctionIgnoredRegexp,           value: '([_A-Z0-9]+|BM_.*)' }
+  - { key: readability-identifier-naming.LocalVariableCase,               value: lower_case }
+  - { key: readability-identifier-naming.LocalVariableIgnoredRegexp,      value: '(_.*|.*_)' }
+  - { key: readability-identifier-naming.MacroDefinitionCase,             value: UPPER_CASE }
+  - { key: readability-identifier-naming.MemberCase,                      value: lower_case }
+  - { key: readability-identifier-naming.MethodCase,                      value: lower_case }
+  - { key: readability-identifier-naming.MethodIgnoredRegexp,             value: '([_A-Z0-9]+|SetUp|TearDown|do_.*)' }
+  - { key: readability-identifier-naming.NamespaceCase,                   value: lower_case }
+  - { key: readability-identifier-naming.ParameterCase,                   value: lower_case }
+  - { key: readability-identifier-naming.PrivateMemberCase,               value: lower_case }
+  - { key: readability-identifier-naming.PrivateMemberSuffix,             value: _ }
+  - { key: readability-identifier-naming.ProtectedMemberCase,             value: lower_case }
+  - { key: readability-identifier-naming.ProtectedMemberSuffix,           value: _ }
+  - { key: readability-identifier-naming.StructCase,                      value: CamelCase }
+  - { key: readability-identifier-naming.TypeAliasCase,                   value: CamelCase }
+  - { key: readability-identifier-naming.TypedefCase,                     value: CamelCase }
+  - { key: readability-identifier-naming.TypeTemplateParameterCase,       value: CamelCase }
+  - { key: readability-identifier-naming.UnionCase,                       value: CamelCase }
+  - { key: readability-identifier-naming.ValueTemplateParameterCase,      value: lower_case }
+  - { key: readability-identifier-naming.VariableCase,                    value: lower_case }
+
+# Dangerous but needed, over exhaustive, changes also all your included third-party files in build folders.
+# Solution (partial perhaps) shown below but not yet usable, unfortunately. So after the run you need to revert or
+# delete third-party files.
+HeaderFilterRegex: '.*'
+# negative look ahead not yet supported
+#HeaderFilterRegex: "^.*(?:_deps).*"