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ClickHouse/cmake/warnings.cmake

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CMake
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Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
# Our principle is to enable as many warnings as possible and always do it with "warnings as errors" flag.
#
# But it comes with some cost:
# - we have to disable some warnings in 3rd party libraries (they are located in "contrib" directory)
# - we have to include headers of these libraries as -isystem to avoid warnings from headers
# (this is the same behaviour as if these libraries were located in /usr/include)
# - sometimes warnings from 3rd party libraries may come from macro substitutions in our code
# and we have to wrap them with #pragma GCC/clang diagnostic ignored
Simplify: Move warnings stuff into cmake/warnings.cmake
2022-05-12 18:07:41 +00:00
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
Avoid too large stack frames
2020-06-08 17:35:45 +00:00
# Control maximum size of stack frames. It can be important if the code is run in fibers with small stack size.
Relax the limit
2020-08-02 21:10:57 +00:00
# Only in release build because debug has too large stack frames.
Fix CMake generation and build for native Xcode and AppleClang
2020-11-27 16:33:16 +00:00
if ((NOT CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG") AND (NOT SANITIZE) AND (NOT CMAKE_CXX_COMPILER_ID MATCHES "AppleClang"))
ANTLR4 Grammar for ClickHouse and new parser (#11298)
2020-12-04 02:15:44 +00:00
add_warning(frame-larger-than=65536)
Relax the limit
2020-08-02 21:10:57 +00:00
endif ()
Avoid too large stack frames
2020-06-08 17:35:45 +00:00
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
if (COMPILER_CLANG)
Update warnings.cmake
2022-05-20 00:12:44 +00:00
# Add some warnings that are not available even with -Wall -Wextra -Wpedantic.
# We want to get everything out of the compiler for code quality.
Throw option WEVERYTHING out 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.
2022-05-16 18:44:24 +00:00
add_warning(everything)
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
add_warning(pedantic)
no_warning(zero-length-array)
Throw option WEVERYTHING out 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.
2022-05-16 18:44:24 +00:00
no_warning(c++98-compat-pedantic)
no_warning(c++98-compat)
Clean up constinit usage and add a comment
2022-08-11 11:27:53 +00:00
no_warning(c++20-compat) # Use constinit in C++20 without warnings
Fix 3/4 of trash
2022-09-10 02:34:56 +00:00
no_warning(sign-conversion)
no_warning(implicit-int-conversion)
no_warning(implicit-int-float-conversion)
Throw option WEVERYTHING out 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.
2022-05-16 18:44:24 +00:00
no_warning(ctad-maybe-unsupported) # clang 9+, linux-only
no_warning(disabled-macro-expansion)
no_warning(documentation-unknown-command)
no_warning(double-promotion)
no_warning(exit-time-destructors)
no_warning(float-equal)
no_warning(global-constructors)
no_warning(missing-prototypes)
no_warning(missing-variable-declarations)
no_warning(padded)
no_warning(switch-enum)
no_warning(undefined-func-template)
no_warning(unused-template)
no_warning(vla)
no_warning(weak-template-vtables)
no_warning(weak-vtables)
Support for Clang Thread Safety Analysis (TSA) - TSA is a static analyzer build by Google which finds race conditions and deadlocks at compile time. - It works by associating a shared member variable with a synchronization primitive that protects it. The compiler can then check at each access if proper locking happened before. A good introduction are [0] and [1]. - TSA requires some help by the programmer via annotations. Luckily, LLVM's libcxx already has annotations for std::mutex, std::lock_guard, std::shared_mutex and std::scoped_lock. This commit enables them (--> contrib/libcxx-cmake/CMakeLists.txt). - Further, this commit adds convenience macros for the low-level annotations for use in ClickHouse (--> base/defines.h). For demonstration, they are leveraged in a few places. - As we compile with "-Wall -Wextra -Weverything", the required compiler flag "-Wthread-safety-analysis" was already enabled. Negative checks are an experimental feature of TSA and disabled (--> cmake/warnings.cmake). Compile times did not increase noticeably. - TSA is used in a few places with simple locking. I tried TSA also where locking is more complex. The problem was usually that it is unclear which data is protected by which lock :-(. But there was definitely some weird code where locking looked broken. So there is some potential to find bugs. *** Limitations of TSA besides the ones listed in [1]: - The programmer needs to know which lock protects which piece of shared data. This is not always easy for large classes. - Two synchronization primitives used in ClickHouse are not annotated in libcxx: (1) std::unique_lock: A releaseable lock handle often together with std::condition_variable, e.g. in solve producer-consumer problems. (2) std::recursive_mutex: A re-entrant mutex variant. Its usage can be considered a design flaw + typically it is slower than a standard mutex. In this commit, one std::recursive_mutex was converted to std::mutex and annotated with TSA. - For free-standing functions (e.g. helper functions) which are passed shared data members, it can be tricky to specify the associated lock. This is because the annotations use the normal C++ rules for symbol resolution. [0] https://clang.llvm.org/docs/ThreadSafetyAnalysis.html [1] https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/42958.pdf
2022-06-14 22:35:55 +00:00
no_warning(thread-safety-negative) # experimental flag, too many false positives
Support build with clang-16
2022-08-13 04:06:01 +00:00
no_warning(enum-constexpr-conversion) # breaks magic-enum library in clang-16
Update flags
2023-02-28 14:45:33 +00:00
no_warning(unsafe-buffer-usage) # too aggressive
Throw option WEVERYTHING out 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.
2022-05-16 18:44:24 +00:00
# TODO Enable conversion, sign-conversion, double-promotion warnings.
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
elseif (COMPILER_GCC)
# Add compiler options only to c++ compiler
function(add_cxx_compile_options option)
add_compile_options("$<$<STREQUAL:$<TARGET_PROPERTY:LINKER_LANGUAGE>,CXX>:${option}>")
endfunction()
# Warn about boolean expression compared with an integer value different from true/false
add_cxx_compile_options(-Wbool-compare)
# Warn whenever a pointer is cast such that the required alignment of the target is increased.
add_cxx_compile_options(-Wcast-align)
# Warn whenever a pointer is cast so as to remove a type qualifier from the target type.
add_cxx_compile_options(-Wcast-qual)
# Warn when deleting a pointer to incomplete type, which may cause undefined behavior at runtime
add_cxx_compile_options(-Wdelete-incomplete)
# Warn if a requested optimization pass is disabled. Code is too big or too complex
add_cxx_compile_options(-Wdisabled-optimization)
# Warn about duplicated conditions in an if-else-if chain
add_cxx_compile_options(-Wduplicated-cond)
# Warn about a comparison between values of different enumerated types
add_cxx_compile_options(-Wenum-compare)
# Warn about uninitialized variables that are initialized with themselves
add_cxx_compile_options(-Winit-self)
# Warn about logical not used on the left hand side operand of a comparison
add_cxx_compile_options(-Wlogical-not-parentheses)
# Warn about suspicious uses of logical operators in expressions
add_cxx_compile_options(-Wlogical-op)
# Warn if there exists a path from the function entry to a use of the variable that is uninitialized.
add_cxx_compile_options(-Wmaybe-uninitialized)
# Warn when the indentation of the code does not reflect the block structure
add_cxx_compile_options(-Wmisleading-indentation)
# Warn if a global function is defined without a previous declaration - disabled because of build times
# add_cxx_compile_options(-Wmissing-declarations)
# Warn if a user-supplied include directory does not exist
add_cxx_compile_options(-Wmissing-include-dirs)
# Obvious
add_cxx_compile_options(-Wnon-virtual-dtor)
# Obvious
add_cxx_compile_options(-Wno-return-local-addr)
# This warning is disabled due to false positives if compiled with libc++: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90037
#add_cxx_compile_options(-Wnull-dereference)
# Obvious
add_cxx_compile_options(-Wodr)
# Obvious
add_cxx_compile_options(-Wold-style-cast)
# Warn when a function declaration hides virtual functions from a base class
# add_cxx_compile_options(-Woverloaded-virtual)
# Warn about placement new expressions with undefined behavior
add_cxx_compile_options(-Wplacement-new=2)
# Warn about anything that depends on the “size of” a function type or of void
add_cxx_compile_options(-Wpointer-arith)
# Warn if anything is declared more than once in the same scope
add_cxx_compile_options(-Wredundant-decls)
# Member initialization reordering
add_cxx_compile_options(-Wreorder)
# Obvious
add_cxx_compile_options(-Wshadow)
# Warn if left shifting a negative value
add_cxx_compile_options(-Wshift-negative-value)
# Warn about a definition of an unsized deallocation function
add_cxx_compile_options(-Wsized-deallocation)
# Warn when the sizeof operator is applied to a parameter that is declared as an array in a function definition
add_cxx_compile_options(-Wsizeof-array-argument)
# Warn for suspicious length parameters to certain string and memory built-in functions if the argument uses sizeof
add_cxx_compile_options(-Wsizeof-pointer-memaccess)
Remove switches for obsolete GCC version GCC_MINIMUM_VERSION is 11 --> remove special logic for earlier GCCs.
2022-04-30 18:21:38 +00:00
# Warn about overriding virtual functions that are not marked with the override keyword
add_cxx_compile_options(-Wsuggest-override)
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
# Warn whenever a switch statement has an index of boolean type and the case values are outside the range of a boolean type
add_cxx_compile_options(-Wswitch-bool)
# Warn if a self-comparison always evaluates to true or false
add_cxx_compile_options(-Wtautological-compare)
# Warn about trampolines generated for pointers to nested functions
add_cxx_compile_options(-Wtrampolines)
# Obvious
add_cxx_compile_options(-Wunused)
Add -Wundef for gcc
2021-04-18 07:01:05 +00:00
add_cxx_compile_options(-Wundef)
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
# Warn if vector operation is not implemented via SIMD capabilities of the architecture
add_cxx_compile_options(-Wvector-operation-performance)
cmake: do not allow internal libstdc++ usage Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
2022-01-20 14:45:42 +00:00
# Warn when a literal 0 is used as null pointer constant.
add_cxx_compile_options(-Wzero-as-null-pointer-constant)
Disable -Wsequence-point on gcc10 (otherwise it stuck on GatherUtils compiling) clang (10.0.0 is fine BTW) will warn about this anyway on CI. For the debug build gcc10: - before patch: - concat.cpp -> >5m (stuck on cc1plus, not as) - has.cpp -> >10m (stuck on cc1plus, not as) - after this patch: - concat.cpp -> 1m16s - has.cpp -> 4m (and most of the time eats, as from binutils 2.34.50.20200508) Command for build: - ninja src/Functions/GatherUtils/CMakeFiles/clickhouse_functions_gatherutils.dir/concat.cpp.o - ninja src/Functions/GatherUtils/CMakeFiles/clickhouse_functions_gatherutils.dir/has.cpp.o The test case should be reduced and then it can be reported to the gcc bugzilla. P.S. Looks like a signal not to switch to gcc10 for now
2020-05-21 18:18:34 +00:00
Remove switches for obsolete GCC version GCC_MINIMUM_VERSION is 11 --> remove special logic for earlier GCCs.
2022-04-30 18:21:38 +00:00
# The following warnings are generally useful but had to be disabled because of compiler bugs with older GCCs.
# XXX: We should try again on more recent GCCs (--> see CMake variable GCC_MINIMUM_VERSION).
Fix build
2021-09-09 14:59:25 +00:00
Remove switches for obsolete GCC version GCC_MINIMUM_VERSION is 11 --> remove special logic for earlier GCCs.
2022-04-30 18:21:38 +00:00
# gcc10 stuck with this option while compiling GatherUtils code, anyway there are builds with clang that will warn
add_cxx_compile_options(-Wno-sequence-point)
# gcc10 false positive with this warning in MergeTreePartition.cpp
# inlined from 'void writeHexByteLowercase(UInt8, void*)' at ../src/Common/hex.h:39:11,
# inlined from 'DB::String DB::MergeTreePartition::getID(const DB::Block&) const' at ../src/Storages/MergeTree/MergeTreePartition.cpp:85:30:
# ../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=]
# 34 | return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
# For some reason (bug in gcc?) macro 'GCC diagnostic ignored "-Wstringop-overflow"' doesn't help.
add_cxx_compile_options(-Wno-stringop-overflow)
# reinterpretAs.cpp:182:31: error: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type
# ‘using ToFieldType = using FieldType = using UUID = struct StrongTypedef<wide::integer<128, unsigned int>, DB::UUIDTag>’
# {aka ‘struct StrongTypedef<wide::integer<128, unsigned int>, DB::UUIDTag>’} from an array of ‘const char8_t’
add_cxx_compile_options(-Wno-error=class-memaccess)
# Maybe false positive...
# In file included from /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/memory:673,
# In function ‘void std::__1::__libcpp_operator_delete(_Args ...) [with _Args = {void*, long unsigned int}]’,
# 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,
# inlined from ‘void std::__1::__libcpp_deallocate(void*, size_t, size_t)’ at /home/jakalletti/ClickHouse/ClickHouse/contrib/libcxx/include/new:285:41,
# 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,
# 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,
# 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,
# 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,
# inlined from ‘DB::JSONBuilder::JSONMap::Pair::~Pair()’ at /home/jakalletti/ClickHouse/ClickHouse/src/Common/JSONBuilder.h:90:12,
# inlined from ‘void DB::JSONBuilder::JSONMap::add(std::__1::string, DB::JSONBuilder::ItemPtr)’ at /home/jakalletti/ClickHouse/ClickHouse/src/Common/JSONBuilder.h:97:68,
# inlined from ‘virtual void DB::ExpressionStep::describeActions(DB::JSONBuilder::JSONMap&) const’ at /home/jakalletti/ClickHouse/ClickHouse/src/Processors/QueryPlan/ExpressionStep.cpp:102:12:
# /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]
add_cxx_compile_options(-Wno-error=free-nonheap-object)
# AggregateFunctionAvg.h:203:100: error: ‘this’ pointer is null [-Werror=nonnull]
add_cxx_compile_options(-Wno-error=nonnull)
Enable extra warnings for base, utils, programs
2020-05-09 22:59:34 +00:00
endif ()
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