[all-commits] [llvm/llvm-project] 984be7: [CMake] Disable more noisy GCC warnings (#159044)
Martin Storsjö via All-commits
all-commits at lists.llvm.org
Tue Sep 16 13:12:29 PDT 2025
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 984be7c5a7e34857577093c74dd9270227c0f887
https://github.com/llvm/llvm-project/commit/984be7c5a7e34857577093c74dd9270227c0f887
Author: Martin Storsjö <martin at martin.st>
Date: 2025-09-16 (Tue, 16 Sep 2025)
Changed paths:
M llvm/cmake/modules/HandleLLVMOptions.cmake
Log Message:
-----------
[CMake] Disable more noisy GCC warnings (#159044)
This disables the following very noisy warning:
In file included from /usr/include/c++/13/string:51,
from /usr/include/c++/13/bits/locale_classes.h:40,
from /usr/include/c++/13/bits/ios_base.h:41,
from /usr/include/c++/13/streambuf:43,
from /usr/include/c++/13/bits/streambuf_iterator.h:35,
from /usr/include/c++/13/iterator:66,
from ../include/llvm/ADT/ADL.h:13,
from ../include/llvm/ADT/DenseMap.h:17,
from ../lib/Transforms/Vectorize/VPlanAnalysis.h:12,
from ../lib/Transforms/Vectorize/VPlan.h:27,
from ../lib/Transforms/Vectorize/LoopVectorizationPlanner.h:27, from
../lib/Transforms/Vectorize/VPlanConstruction.cpp:14:
In static member function ‘static _Up* std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp =
llvm::VPBlockBase*; _Up = llvm::VPBlockBase*; bool _IsMove = true]’,
inlined from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:506:30,
inlined from ‘_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:533:42,
inlined from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:540:31,
inlined from ‘_OI std::move(_II, _II, _OI) [with _II =
llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:665:38,
inlined from ‘llvm::SmallVectorImpl<T>&
llvm::SmallVectorImpl<T>::operator=(llvm::SmallVectorImpl<T>&&) [with T
= llvm::VPBlockBase*]’ at ../include/llvm/ADT/SmallVector.h:1071:25,
inlined from ‘llvm::SmallVector<T, N>& llvm::SmallVector<T,
N>::operator=(llvm::SmallVector<T, N>&&) [with T = llvm::VPBlockBase*;
unsigned int N = 1]’ at ../include/llvm/ADT/SmallVector.h:1259:36,
inlined from ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’ at
../include/llvm/Support/GenericDomTreeConstruction.h:578:14:
/usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
__builtin_memmove(void*, const void*, long unsigned int)’ forming offset
24 is out of the bounds [0, 24] of object ‘<anonymous>’ with type
‘llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::VPBlockBase,
false> >::RootsT’ {aka ‘llvm::SmallVector<llvm::VPBlockBase*, 1>’}
[-Warray-bounds=]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from
../lib/Transforms/Vectorize/VPlanDominatorTree.h:23,
from ../lib/Transforms/Vectorize/VPlanConstruction.cpp:17:
../include/llvm/Support/GenericDomTreeConstruction.h: In static member
function ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’:
../include/llvm/Support/GenericDomTreeConstruction.h:578:25: note:
‘<anonymous>’ declared here
578 | DT.Roots = FindRoots(DT, PostViewBUI);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~
In static member function ‘static _Up* std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp =
llvm::VPBlockBase*; _Up = llvm::VPBlockBase*; bool _IsMove = true]’,
inlined from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:506:30,
inlined from ‘_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:533:42,
inlined from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:540:31,
inlined from ‘_OI std::move(_II, _II, _OI) [with _II =
llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:665:38,
inlined from ‘llvm::SmallVectorImpl<T>&
llvm::SmallVectorImpl<T>::operator=(llvm::SmallVectorImpl<T>&&) [with T
= llvm::VPBlockBase*]’ at ../include/llvm/ADT/SmallVector.h:1094:14,
inlined from ‘llvm::SmallVector<T, N>& llvm::SmallVector<T,
N>::operator=(llvm::SmallVector<T, N>&&) [with T = llvm::VPBlockBase*;
unsigned int N = 1]’ at ../include/llvm/ADT/SmallVector.h:1259:36,
inlined from ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’ at
../include/llvm/Support/GenericDomTreeConstruction.h:578:14:
/usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
__builtin_memmove(void*, const void*, long unsigned int)’ forming offset
24 is out of the bounds [0, 24] of object ‘<anonymous>’ with type
‘llvm::DomTreeBuilder::SemiNCAInfo<llvm::DominatorTreeBase<llvm::VPBlockBase,
false> >::RootsT’ {aka ‘llvm::SmallVector<llvm::VPBlockBase*, 1>’}
[-Warray-bounds=]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/llvm/Support/GenericDomTreeConstruction.h: In static member
function ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’:
../include/llvm/Support/GenericDomTreeConstruction.h:578:25: note:
‘<anonymous>’ declared here
578 | DT.Roots = FindRoots(DT, PostViewBUI);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~
In a regular build, there's currently 14 such warning instances, but
since they are so large and noisy, they are very disruptive, and they
don't seem to be an actual issue in the LLVM code base.
With the -Warray-bounds warning disabled, the build instead ends up with
9 similar warnings of the kind -Wstringop-overread:
In file included from /usr/include/c++/13/string:51,
from /usr/include/c++/13/bits/locale_classes.h:40,
from /usr/include/c++/13/bits/ios_base.h:41,
from /usr/include/c++/13/streambuf:43,
from /usr/include/c++/13/bits/streambuf_iterator.h:35,
from /usr/include/c++/13/iterator:66,
from ../include/llvm/ADT/ADL.h:13,
from ../include/llvm/ADT/DenseMap.h:17,
from ../lib/Transforms/Vectorize/VPlanAnalysis.h:12,
from ../lib/Transforms/Vectorize/VPlan.h:27,
from ../lib/Transforms/Vectorize/LoopVectorizationPlanner.h:27, from
../lib/Transforms/Vectorize/VPlanConstruction.cpp:14:
In static member function ‘static _Up* std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp =
llvm::VPBlockBase*; _Up = llvm::VPBlockBase*; bool _IsMove = true]’,
inlined from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:506:30,
inlined from ‘_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:533:42,
inlined from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:540:31,
inlined from ‘_OI std::move(_II, _II, _OI) [with _II =
llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:665:38,
inlined from ‘llvm::SmallVectorImpl<T>&
llvm::SmallVectorImpl<T>::operator=(llvm::SmallVectorImpl<T>&&) [with T
= llvm::VPBlockBase*]’ at ../include/llvm/ADT/SmallVector.h:1071:25,
inlined from ‘llvm::SmallVector<T, N>& llvm::SmallVector<T,
N>::operator=(llvm::SmallVector<T, N>&&) [with T = llvm::VPBlockBase*;
unsigned int N = 1]’ at ../include/llvm/ADT/SmallVector.h:1259:36,
inlined from ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’ at
../include/llvm/Support/GenericDomTreeConstruction.h:578:14:
/usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
__builtin_memmove(void*, const void*, long unsigned int)’ reading
between 9 and 34359738360 bytes from a region of size 8
[-Wstringop-overread]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from
../lib/Transforms/Vectorize/VPlanDominatorTree.h:23,
from ../lib/Transforms/Vectorize/VPlanConstruction.cpp:17:
../include/llvm/Support/GenericDomTreeConstruction.h: In static member
function ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’:
../include/llvm/Support/GenericDomTreeConstruction.h:578:25: note: at
offset 16 into source object ‘<anonymous>’ of size 24
578 | DT.Roots = FindRoots(DT, PostViewBUI);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~
In static member function ‘static _Up* std::__copy_move<_IsMove, true,
std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp =
llvm::VPBlockBase*; _Up = llvm::VPBlockBase*; bool _IsMove = true]’,
inlined from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:506:30,
inlined from ‘_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove
= true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:533:42,
inlined from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
true; _II = llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:540:31,
inlined from ‘_OI std::move(_II, _II, _OI) [with _II =
llvm::VPBlockBase**; _OI = llvm::VPBlockBase**]’ at
/usr/include/c++/13/bits/stl_algobase.h:665:38,
inlined from ‘llvm::SmallVectorImpl<T>&
llvm::SmallVectorImpl<T>::operator=(llvm::SmallVectorImpl<T>&&) [with T
= llvm::VPBlockBase*]’ at ../include/llvm/ADT/SmallVector.h:1094:14,
inlined from ‘llvm::SmallVector<T, N>& llvm::SmallVector<T,
N>::operator=(llvm::SmallVector<T, N>&&) [with T = llvm::VPBlockBase*;
unsigned int N = 1]’ at ../include/llvm/ADT/SmallVector.h:1259:36,
inlined from ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’ at
../include/llvm/Support/GenericDomTreeConstruction.h:578:14:
/usr/include/c++/13/bits/stl_algobase.h:437:30: warning: ‘void*
__builtin_memmove(void*, const void*, long unsigned int)’ reading
between 9 and 34359738352 bytes from a region of size 8
[-Wstringop-overread]
437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/llvm/Support/GenericDomTreeConstruction.h: In static member
function ‘static void
llvm::DomTreeBuilder::SemiNCAInfo<DomTreeT>::CalculateFromScratch(DomTreeT&,
BatchUpdatePtr) [with DomTreeT =
llvm::DominatorTreeBase<llvm::VPBlockBase, false>]’:
../include/llvm/Support/GenericDomTreeConstruction.h:578:25: note: at
offset 16 into source object ‘<anonymous>’ of size 24
578 | DT.Roots = FindRoots(DT, PostViewBUI);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~
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