[llvm] [Support] Replace deprecated std::aligned_union, NFCI. (PR #127417)

Tue Feb 25 12:02:22 PST 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-sles-build-only` running on `rocm-worker-hw-04-sles` while building `llvm` at step 5 "compile-openmp".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/140/builds/17695

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (compile-openmp) failure: build (failure)
...
     for (const auto &[SC, _] : SuperClasses) {
                            ^
3.073 [6880/32/195] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/Timer.cpp.o
3.083 [6879/32/196] Building CXX object lib/Option/CMakeFiles/LLVMOption.dir/Arg.cpp.o
3.091 [6878/32/197] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/Line.cpp.o
3.093 [6877/32/198] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/TimeProfiler.cpp.o
3.113 [6876/32/199] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/RecordName.cpp.o
3.114 [6875/32/200] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/RecordSerialization.cpp.o
3.131 [6874/32/201] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/SimpleTypeSerializer.cpp.o
3.149 [6873/32/202] Building CXX object utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o
FAILED: utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iutils/TableGen/Basic -I/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic -Iinclude -I/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -Wno-misleading-indentation -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++1z -MD -MT utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o -MF utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o.d -o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o -c /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp
In file included from /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp:19:0:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h: In member function ‘bool llvm::Record::isSubClassOf(const llvm::Record*) const’:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h:1797:28: warning: unused variable ‘_’ [-Wunused-variable]
     for (const auto &[SC, _] : SuperClasses)
                            ^
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h: In member function ‘bool llvm::Record::isSubClassOf(llvm::StringRef) const’:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h:1804:28: warning: unused variable ‘_’ [-Wunused-variable]
     for (const auto &[SC, _] : SuperClasses) {
                            ^
In file included from /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:19:0,
                 from /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/CodeGenIntrinsics.h:18,
                 from /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp:13:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/Support/AlignOf.h: In instantiation of ‘struct llvm::AlignedCharArrayUnion<llvm::detail::DenseSetPair<llvm::StringRef> [4]>’:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:1049:53:   required from ‘void llvm::SmallDenseMap<KeyT, ValueT, InlineBuckets, KeyInfoT, BucketT>::grow(unsigned int) [with KeyT = llvm::StringRef; ValueT = llvm::detail::DenseSetEmpty; unsigned int InlineBuckets = 4; KeyInfoT = llvm::DenseMapInfo<llvm::StringRef, void>; BucketT = llvm::detail::DenseSetPair<llvm::StringRef>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:536:33:   required from ‘void llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::grow(unsigned int) [with DerivedT = llvm::SmallDenseMap<llvm::StringRef, llvm::detail::DenseSetEmpty, 4, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseSetPair<llvm::StringRef> >; KeyT = llvm::StringRef; ValueT = llvm::detail::DenseSetEmpty; KeyInfoT = llvm::DenseMapInfo<llvm::StringRef, void>; BucketT = llvm::detail::DenseSetPair<llvm::StringRef>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:576:13:   required from ‘BucketT* llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::InsertIntoBucketImpl(const LookupKeyT&, BucketT*) [with LookupKeyT = llvm::StringRef; DerivedT = llvm::SmallDenseMap<llvm::StringRef, llvm::detail::DenseSetEmpty, 4, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseSetPair<llvm::StringRef> >; KeyT = llvm::StringRef; ValueT = llvm::detail::DenseSetEmpty; KeyInfoT = llvm::DenseMapInfo<llvm::StringRef, void>; BucketT = llvm::detail::DenseSetPair<llvm::StringRef>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:543:37:   required from ‘BucketT* llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::InsertIntoBucket(BucketT*, KeyArg&&, ValueArgs&& ...) [with KeyArg = const llvm::StringRef&; ValueArgs = {llvm::detail::DenseSetEmpty&}; DerivedT = llvm::SmallDenseMap<llvm::StringRef, llvm::detail::DenseSetEmpty, 4, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseSetPair<llvm::StringRef> >; KeyT = llvm::StringRef; ValueT = llvm::detail::DenseSetEmpty; KeyInfoT = llvm::DenseMapInfo<llvm::StringRef, void>; BucketT = llvm::detail::DenseSetPair<llvm::StringRef>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseMap.h:262:33:   required from ‘std::pair<llvm::DenseMapIterator<KeyT, ValueT, KeyInfoT, BucketT>, bool> llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::try_emplace(const KeyT&, Ts&& ...) [with Ts = {llvm::detail::DenseSetEmpty&}; DerivedT = llvm::SmallDenseMap<llvm::StringRef, llvm::detail::DenseSetEmpty, 4, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseSetPair<llvm::StringRef> >; KeyT = llvm::StringRef; ValueT = llvm::detail::DenseSetEmpty; KeyInfoT = llvm::DenseMapInfo<llvm::StringRef, void>; BucketT = llvm::detail::DenseSetPair<llvm::StringRef>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/ADT/DenseSet.h:215:39:   required from ‘std::pair<llvm::detail::DenseSetImpl<ValueT, MapTy, ValueInfoT>::Iterator, bool> llvm::detail::DenseSetImpl<ValueT, MapTy, ValueInfoT>::insert(const ValueT&) [with ValueT = llvm::StringRef; MapTy = llvm::SmallDenseMap<llvm::StringRef, llvm::detail::DenseSetEmpty, 4, llvm::DenseMapInfo<llvm::StringRef, void>, llvm::detail::DenseSetPair<llvm::StringRef> >; ValueInfoT = llvm::DenseMapInfo<llvm::StringRef, void>]’
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/CodeGenIntrinsics.cpp:111:35:   required from here
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/Support/AlignOf.h:23:77: internal compiler error: Segmentation fault
   alignas(T) alignas(Ts...) char buffer[std::max({sizeof(T), sizeof(Ts)...})];
                                                                             ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.opensuse.org/> for instructions.
3.173 [6873/31/203] Building CXX object lib/Option/CMakeFiles/LLVMOption.dir/Option.cpp.o
3.184 [6873/30/204] Building CXX object utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/Attributes.cpp.o
In file included from /home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/utils/TableGen/Basic/Attributes.cpp:10:0:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h: In member function ‘bool llvm::Record::isSubClassOf(const llvm::Record*) const’:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h:1797:28: warning: unused variable ‘_’ [-Wunused-variable]
     for (const auto &[SC, _] : SuperClasses)
                            ^
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h: In member function ‘bool llvm::Record::isSubClassOf(llvm::StringRef) const’:
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/include/llvm/TableGen/Record.h:1804:28: warning: unused variable ‘_’ [-Wunused-variable]
     for (const auto &[SC, _] : SuperClasses) {
                            ^

```

</details>

https://github.com/llvm/llvm-project/pull/127417