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34af1cb116
WEVERYTHING enables on Clang literally every warning. People on the internet are divided if this is a good thing or not but ClickHouse compiles with -Weverything + some exceptions for noisy warnings since at least a year. I tried to build with WEVERYTHING = OFF and the build was badly broken. It seems nobody actually turns WEVERYTHING off. Actually, why would one if the CI builds (configured with WEVERYTHING = ON) potentially generate errors not generated in local development. To simplify the build scripts and to remove the need to maintain two sets of compiler warnings, I made WEVERYTHING the default and threw WEVERYTHING = OFF out.
164 lines
11 KiB
CMake
164 lines
11 KiB
CMake
# Our principle is to enable as many warnings as possible and always do it with "warnings as errors" flag.
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#
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# But it comes with some cost:
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# - we have to disable some warnings in 3rd party libraries (they are located in "contrib" directory)
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# - we have to include headers of these libraries as -isystem to avoid warnings from headers
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# (this is the same behaviour as if these libraries were located in /usr/include)
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# - sometimes warnings from 3rd party libraries may come from macro substitutions in our code
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# and we have to wrap them with #pragma GCC/clang diagnostic ignored
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
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# Control maximum size of stack frames. It can be important if the code is run in fibers with small stack size.
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# Only in release build because debug has too large stack frames.
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if ((NOT CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG") AND (NOT SANITIZE) AND (NOT CMAKE_CXX_COMPILER_ID MATCHES "AppleClang"))
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add_warning(frame-larger-than=65536)
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endif ()
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if (COMPILER_CLANG)
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add_warning(everything)
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add_warning(pedantic)
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no_warning(vla-extension)
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no_warning(zero-length-array)
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no_warning(c11-extensions)
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no_warning(unused-command-line-argument)
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no_warning(c++98-compat-pedantic)
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no_warning(c++98-compat)
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no_warning(c99-extensions)
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no_warning(conversion)
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no_warning(ctad-maybe-unsupported) # clang 9+, linux-only
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no_warning(deprecated-dynamic-exception-spec)
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no_warning(disabled-macro-expansion)
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no_warning(documentation-unknown-command)
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no_warning(double-promotion)
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no_warning(exit-time-destructors)
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no_warning(float-equal)
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no_warning(global-constructors)
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no_warning(missing-prototypes)
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no_warning(missing-variable-declarations)
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no_warning(nested-anon-types)
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no_warning(packed)
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no_warning(padded)
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no_warning(return-std-move-in-c++11) # clang 7+
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no_warning(shift-sign-overflow)
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no_warning(sign-conversion)
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no_warning(switch-enum)
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no_warning(undefined-func-template)
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no_warning(unused-template)
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no_warning(vla)
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no_warning(weak-template-vtables)
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no_warning(weak-vtables)
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# TODO Enable conversion, sign-conversion, double-promotion warnings.
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elseif (COMPILER_GCC)
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# Add compiler options only to c++ compiler
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function(add_cxx_compile_options option)
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add_compile_options("$<$<STREQUAL:$<TARGET_PROPERTY:LINKER_LANGUAGE>,CXX>:${option}>")
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endfunction()
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# Warn about boolean expression compared with an integer value different from true/false
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add_cxx_compile_options(-Wbool-compare)
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# Warn whenever a pointer is cast such that the required alignment of the target is increased.
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add_cxx_compile_options(-Wcast-align)
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# Warn whenever a pointer is cast so as to remove a type qualifier from the target type.
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add_cxx_compile_options(-Wcast-qual)
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# Warn when deleting a pointer to incomplete type, which may cause undefined behavior at runtime
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add_cxx_compile_options(-Wdelete-incomplete)
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# Warn if a requested optimization pass is disabled. Code is too big or too complex
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add_cxx_compile_options(-Wdisabled-optimization)
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# Warn about duplicated conditions in an if-else-if chain
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add_cxx_compile_options(-Wduplicated-cond)
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# Warn about a comparison between values of different enumerated types
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add_cxx_compile_options(-Wenum-compare)
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# Warn about uninitialized variables that are initialized with themselves
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add_cxx_compile_options(-Winit-self)
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# Warn about logical not used on the left hand side operand of a comparison
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add_cxx_compile_options(-Wlogical-not-parentheses)
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# Warn about suspicious uses of logical operators in expressions
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add_cxx_compile_options(-Wlogical-op)
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# Warn if there exists a path from the function entry to a use of the variable that is uninitialized.
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add_cxx_compile_options(-Wmaybe-uninitialized)
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# Warn when the indentation of the code does not reflect the block structure
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add_cxx_compile_options(-Wmisleading-indentation)
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# Warn if a global function is defined without a previous declaration - disabled because of build times
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# add_cxx_compile_options(-Wmissing-declarations)
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# Warn if a user-supplied include directory does not exist
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add_cxx_compile_options(-Wmissing-include-dirs)
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# Obvious
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add_cxx_compile_options(-Wnon-virtual-dtor)
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# Obvious
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add_cxx_compile_options(-Wno-return-local-addr)
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# This warning is disabled due to false positives if compiled with libc++: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90037
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#add_cxx_compile_options(-Wnull-dereference)
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# Obvious
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add_cxx_compile_options(-Wodr)
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# Obvious
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add_cxx_compile_options(-Wold-style-cast)
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# Warn when a function declaration hides virtual functions from a base class
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# add_cxx_compile_options(-Woverloaded-virtual)
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# Warn about placement new expressions with undefined behavior
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add_cxx_compile_options(-Wplacement-new=2)
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# Warn about anything that depends on the “size of” a function type or of void
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add_cxx_compile_options(-Wpointer-arith)
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# Warn if anything is declared more than once in the same scope
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add_cxx_compile_options(-Wredundant-decls)
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# Member initialization reordering
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add_cxx_compile_options(-Wreorder)
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# Obvious
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add_cxx_compile_options(-Wshadow)
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# Warn if left shifting a negative value
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add_cxx_compile_options(-Wshift-negative-value)
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# Warn about a definition of an unsized deallocation function
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add_cxx_compile_options(-Wsized-deallocation)
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# Warn when the sizeof operator is applied to a parameter that is declared as an array in a function definition
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add_cxx_compile_options(-Wsizeof-array-argument)
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# Warn for suspicious length parameters to certain string and memory built-in functions if the argument uses sizeof
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add_cxx_compile_options(-Wsizeof-pointer-memaccess)
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# Warn about overriding virtual functions that are not marked with the override keyword
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add_cxx_compile_options(-Wsuggest-override)
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# Warn whenever a switch statement has an index of boolean type and the case values are outside the range of a boolean type
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add_cxx_compile_options(-Wswitch-bool)
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# Warn if a self-comparison always evaluates to true or false
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add_cxx_compile_options(-Wtautological-compare)
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# Warn about trampolines generated for pointers to nested functions
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add_cxx_compile_options(-Wtrampolines)
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# Obvious
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add_cxx_compile_options(-Wunused)
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add_cxx_compile_options(-Wundef)
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# Warn if vector operation is not implemented via SIMD capabilities of the architecture
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add_cxx_compile_options(-Wvector-operation-performance)
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# Warn when a literal 0 is used as null pointer constant.
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add_cxx_compile_options(-Wzero-as-null-pointer-constant)
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# The following warnings are generally useful but had to be disabled because of compiler bugs with older GCCs.
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# XXX: We should try again on more recent GCCs (--> see CMake variable GCC_MINIMUM_VERSION).
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# gcc10 stuck with this option while compiling GatherUtils code, anyway there are builds with clang that will warn
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add_cxx_compile_options(-Wno-sequence-point)
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# gcc10 false positive with this warning in MergeTreePartition.cpp
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# inlined from 'void writeHexByteLowercase(UInt8, void*)' at ../src/Common/hex.h:39:11,
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# inlined from 'DB::String DB::MergeTreePartition::getID(const DB::Block&) const' at ../src/Storages/MergeTree/MergeTreePartition.cpp:85:30:
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# ../contrib/libc-headers/x86_64-linux-gnu/bits/string_fortified.h:34:33: error: writing 2 bytes into a region of size 0 [-Werror=stringop-overflow=]
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# 34 | return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
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# For some reason (bug in gcc?) macro 'GCC diagnostic ignored "-Wstringop-overflow"' doesn't help.
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add_cxx_compile_options(-Wno-stringop-overflow)
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# reinterpretAs.cpp:182:31: error: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type
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# ‘using ToFieldType = using FieldType = using UUID = struct StrongTypedef<wide::integer<128, unsigned int>, DB::UUIDTag>’
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# {aka ‘struct StrongTypedef<wide::integer<128, unsigned int>, DB::UUIDTag>’} from an array of ‘const char8_t’
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add_cxx_compile_options(-Wno-error=class-memaccess)
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# Maybe false positive...
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# In file included from /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/memory:673,
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# In function ‘void std::__1::__libcpp_operator_delete(_Args ...) [with _Args = {void*, long unsigned int}]’,
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# inlined from ‘void std::__1::__do_deallocate_handle_size(void*, size_t, _Args ...) [with _Args = {}]’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/new:271:34,
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# inlined from ‘void std::__1::__libcpp_deallocate(void*, size_t, size_t)’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/new:285:41,
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# inlined from ‘constexpr void std::__1::allocator<_Tp>::deallocate(_Tp*, size_t) [with _Tp = char]’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/memory:849:39,
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# inlined from ‘static constexpr void std::__1::allocator_traits<_Alloc>::deallocate(std::__1::allocator_traits<_Alloc>::allocator_type&, std::__1::allocator_traits<_Alloc>::pointer, std::__1::allocator_traits<_Alloc>::size_type) [with _Alloc = std::__1::allocator<char>]’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/__memory/allocator_traits.h:476:24,
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# inlined from ‘std::__1::basic_string<_CharT, _Traits, _Allocator>::~basic_string() [with _CharT = char; _Traits = std::__1::char_traits<char>; _Allocator = std::__1::allocator<char>]’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/string:2219:35,
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# inlined from ‘std::__1::basic_string<_CharT, _Traits, _Allocator>::~basic_string() [with _CharT = char; _Traits = std::__1::char_traits<char>; _Allocator = std::__1::allocator<char>]’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/string:2213:1,
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# inlined from ‘DB::JSONBuilder::JSONMap::Pair::~Pair()’ at /home/jakalletti/ClickHouse/ClickHouse/src/Common/JSONBuilder.h:90:12,
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# inlined from ‘void DB::JSONBuilder::JSONMap::add(std::__1::string, DB::JSONBuilder::ItemPtr)’ at /home/jakalletti/ClickHouse/ClickHouse/src/Common/JSONBuilder.h:97:68,
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# inlined from ‘virtual void DB::ExpressionStep::describeActions(DB::JSONBuilder::JSONMap&) const’ at /home/jakalletti/ClickHouse/ClickHouse/src/Processors/QueryPlan/ExpressionStep.cpp:102:12:
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# /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/new:247:20: error: ‘void operator delete(void*, size_t)’ called on a pointer to an unallocated object ‘7598543875853023301’ [-Werror=free-nonheap-object]
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add_cxx_compile_options(-Wno-error=free-nonheap-object)
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# AggregateFunctionAvg.h:203:100: error: ‘this’ pointer is null [-Werror=nonnull]
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add_cxx_compile_options(-Wno-error=nonnull)
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endif ()
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