Detect a Clang consteval bug

...that hit us since 21584b304b21bfe6b99b6f29018c6b754ea28fc0 "make
OUString(OUStringLiteral) constructor constexpr" e.g. at

> [CXX] sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.cxx
> Assertion failed: (getOperand(0)->getType() == cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr must be a pointer to Val type!"), function AssertOK, file ~/github.com/llvm/llvm-project/llvm/lib/IR/Instructions.cpp, line 1469.
> PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
> Stack dump:
> 0.	Program arguments: ~/llvm/inst/bin/clang++ -target arm64-apple-macos -stdlib=libc++ -mmacosx-version-min=11.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -ferror-limit=0 -DAARCH64 -DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED -DCPPU_ENV=gcc3 -DDBG_UTIL -DMACOSX -DMAC_OS_X_VERSION_MAX_ALLOWED=110100 -DMAC_OS_X_VERSION_MIN_REQUIRED=110000 -DNO_PTHREAD_PRIORITY -DOSL_DEBUG_LEVEL=1 -DSAL_LOG_INFO -DSAL_LOG_WARN -DUNIX -DUNX -D_DEBUG -D_PTHREADS -D_REENTRANT "-DCPPUNIT_PLUGIN_EXPORT=extern \"C\" SAL_DLLPUBLIC_EXPORT" -fvisibility=hidden -Werror -Xclang -load -Xclang ~/lo/core/compilerplugins/clang/plugin.so -Xclang -add-plugin -Xclang loplugin -Xclang -plugin-arg-loplugin -Xclang --debug -Wall -Wno-missing-braces -Wnon-virtual-dtor -Wendif-labels -Wextra -Wundef -Wunreachable-code -Wunused-macros -Wembedded-directive -finput-charset=UTF-8 -fmessage-length=0 -fno-common -pipe -fstack-protector-strong -fdiagnostics-color=always -Wdeprecated-copy-dtor -Wimplicit-fallthrough -Wunused-exception-parameter -Wrange-loop-analysis -fvisibility-inlines-hidden -fPIC -Woverloaded-virtual -Wshadow -Wno-ctor-dtor-privacy -fno-strict-aliasing -fsigned-char -std=c++2b -O0 -fstrict-aliasing -fstrict-overflow -ggdb2 -gsplit-dwarf -Xclang -debug-info-kind=constructor -DEXCEPTIONS_ON -fexceptions -DLIBO_INTERNAL_ONLY -c ~/lo/core/sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.cxx -o ~/lo/core/workdir/CxxObject/sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.o -MMD -MT ~/lo/core/workdir/CxxObject/sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.o -MP -MF ~/lo/core/workdir/Dep/CxxObject/sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.d_ -I~/lo/core/external/boost/include -I~/lo/core/workdir/UnpackedTarball/boost -I~/lo/core/sal/qa/inc -I~/lo/core/workdir/UnpackedTarball/cppunit/include -I~/lo/core/include -I~/azul.com/zulu16.28.11-ca-jdk16.0.0-macosx_aarch64/zulu-16.jdk/Contents/Home/include -I~/azul.com/zulu16.28.11-ca-jdk16.0.0-macosx_aarch64/zulu-16.jdk/Contents/Home/include/darwin -I~/lo/core/config_host
> 1.	<eof> parser at end of file
> 2.	Per-file LLVM IR generation
> 3.	~/lo/core/sal/qa/rtl/oustringbuffer/test_oustringbuffer_assign.cxx:24:10: Generating code for declaration '(anonymous namespace)::Test::test'
> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
> 0  clang++                  0x00000001026d3408 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
> 1  clang++                  0x00000001026d24cc llvm::sys::RunSignalHandlers() + 128
> 2  clang++                  0x00000001026d2b84 llvm::sys::CleanupOnSignal(unsigned long) + 236
> 3  clang++                  0x0000000102628c0c (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) + 128
> 4  clang++                  0x0000000102628df0 CrashRecoverySignalHandler(int) + 152
> 5  libsystem_platform.dylib 0x0000000185c49c44 _sigtramp + 56
> 6  libsystem_pthread.dylib  0x0000000185c01c24 pthread_kill + 292
> 7  libsystem_c.dylib        0x0000000185b49864 abort + 104
> 8  libsystem_c.dylib        0x0000000185b48b68 err + 0
> 9  clang++                  0x0000000104f30fc8 llvm::StoreInst::AssertOK() (.cold.6) + 0
> 10 clang++                  0x0000000101fc1110 llvm::StoreInst::AssertOK() + 164
> 11 clang++                  0x0000000101fc1504 llvm::StoreInst::StoreInst(llvm::Value*, llvm::Value*, bool, llvm::Align, llvm::AtomicOrdering, unsigned char, llvm::Instruction*) + 316
> 12 clang++                  0x00000001022acee4 llvm::IRBuilderBase::CreateAlignedStore(llvm::Value*, llvm::Value*, llvm::MaybeAlign, bool) + 144
> 13 clang++                  0x00000001029ef018 clang::CodeGen::CodeGenFunction::EmitAggregateStore(llvm::Value*, clang::CodeGen::Address, bool) + 216
> 14 clang++                  0x0000000102a6235c clang::StmtVisitorBase<std::__1::add_pointer, (anonymous namespace)::AggExprEmitter, void>::Visit(clang::Stmt*) + 8400
> 15 clang++                  0x0000000102a66ca4 (anonymous namespace)::AggExprEmitter::VisitCastExpr(clang::CastExpr*) + 2132
> 16 clang++                  0x0000000102a5f318 clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) + 532
> 17 clang++                  0x0000000102a496e4 clang::CodeGen::CodeGenFunction::EmitAnyExprToMem(clang::Expr const*, clang::CodeGen::Address, clang::Qualifiers, bool) + 364
> 18 clang++                  0x0000000102a4a438 clang::CodeGen::CodeGenFunction::EmitMaterializeTemporaryExpr(clang::MaterializeTemporaryExpr const*) + 1708
> 19 clang++                  0x0000000102a49210 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*) + 1588
> 20 clang++                  0x0000000102a4bd78 clang::CodeGen::CodeGenFunction::EmitReferenceBindingToExpr(clang::Expr const*) + 36
> 21 clang++                  0x00000001029f9314 clang::CodeGen::CodeGenFunction::EmitCallArg(clang::CodeGen::CallArgList&, clang::Expr const*, clang::QualType) + 672
> 22 clang++                  0x00000001029f8a10 clang::CodeGen::CodeGenFunction::EmitCallArgs(clang::CodeGen::CallArgList&, clang::CodeGen::CodeGenFunction::PrototypeWrapper, llvm::iterator_range<clang::Stmt::CastIterator<clang::Expr, clang::Expr const* const, clang::Stmt const* const> >, clang::CodeGen::CodeGenFunction::AbstractCallee, unsigned int, clang::CodeGen::CodeGenFunction::EvaluationOrder) + 1344
> 23 clang++                  0x0000000102a5da38 clang::CodeGen::CodeGenFunction::EmitCall(clang::QualType, clang::CodeGen::CGCallee const&, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::Value*) + 2176
> 24 clang++                  0x0000000102a5ce00 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) + 560
> 25 clang++                  0x0000000102a66428 clang::CodeGen::RValue llvm::function_ref<clang::CodeGen::RValue (clang::CodeGen::ReturnValueSlot)>::callback_fn<(anonymous namespace)::AggExprEmitter::VisitCallExpr(clang::CallExpr const*)::$_0>(long, clang::CodeGen::ReturnValueSlot) + 72
> 26 clang++                  0x0000000102a662bc (anonymous namespace)::AggExprEmitter::withReturnValueSlot(clang::Expr const*, llvm::function_ref<clang::CodeGen::RValue (clang::CodeGen::ReturnValueSlot)>) + 620
> 27 clang++                  0x0000000102a63564 (anonymous namespace)::AggExprEmitter::VisitCallExpr(clang::CallExpr const*) + 160
> 28 clang++                  0x0000000102a5f318 clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) + 532
> 29 clang++                  0x0000000102a496e4 clang::CodeGen::CodeGenFunction::EmitAnyExprToMem(clang::Expr const*, clang::CodeGen::Address, clang::Qualifiers, bool) + 364
> 30 clang++                  0x0000000102a4a438 clang::CodeGen::CodeGenFunction::EmitMaterializeTemporaryExpr(clang::MaterializeTemporaryExpr const*) + 1708
> 31 clang++                  0x0000000102a49210 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*) + 1588
> 32 clang++                  0x0000000102a4bd78 clang::CodeGen::CodeGenFunction::EmitReferenceBindingToExpr(clang::Expr const*) + 36
> 33 clang++                  0x00000001029f9314 clang::CodeGen::CodeGenFunction::EmitCallArg(clang::CodeGen::CallArgList&, clang::Expr const*, clang::QualType) + 672
> 34 clang++                  0x00000001029f8a10 clang::CodeGen::CodeGenFunction::EmitCallArgs(clang::CodeGen::CallArgList&, clang::CodeGen::CodeGenFunction::PrototypeWrapper, llvm::iterator_range<clang::Stmt::CastIterator<clang::Expr, clang::Expr const* const, clang::Stmt const* const> >, clang::CodeGen::CodeGenFunction::AbstractCallee, unsigned int, clang::CodeGen::CodeGenFunction::EvaluationOrder) + 1344
> 35 clang++                  0x0000000102a6849c clang::CodeGen::CodeGenFunction::EmitCXXMemberOrOperatorMemberCallExpr(clang::CallExpr const*, clang::CXXMethodDecl const*, clang::CodeGen::ReturnValueSlot, bool, clang::NestedNameSpecifier*, bool, clang::Expr const*) + 1164
> 36 clang++                  0x0000000102a69218 clang::CodeGen::CodeGenFunction::EmitCXXOperatorMemberCallExpr(clang::CXXOperatorCallExpr const*, clang::CXXMethodDecl const*, clang::CodeGen::ReturnValueSlot) + 124
> 37 clang++                  0x0000000102a5cd20 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) + 336
> 38 clang++                  0x0000000102a504ac clang::CodeGen::CodeGenFunction::EmitCallExprLValue(clang::CallExpr const*) + 52
> 39 clang++                  0x0000000102a48c78 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*) + 156
> 40 clang++                  0x0000000102a48d70 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*) + 404
> 41 clang++                  0x0000000102a489f4 clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) + 32
> 42 clang++                  0x0000000102b51b6c clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) + 276
> 43 clang++                  0x0000000102b59b74 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) + 168
> 44 clang++                  0x0000000102b9cdf8 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) + 212
> 45 clang++                  0x0000000102b9d6cc clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) + 892
> 46 clang++                  0x0000000102bb651c clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) + 460
> 47 clang++                  0x0000000102bb073c clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) + 568
> 48 clang++                  0x0000000102ba73cc clang::CodeGen::CodeGenModule::EmitDeferred() + 740
> 49 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 50 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 51 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 52 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 53 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 54 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 55 clang++                  0x0000000102ba73f4 clang::CodeGen::CodeGenModule::EmitDeferred() + 780
> 56 clang++                  0x0000000102ba61f4 clang::CodeGen::CodeGenModule::Release() + 76
> 57 clang++                  0x0000000102c2e778 (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) + 80
> 58 clang++                  0x0000000102b94f60 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 180
> 59 clang++                  0x0000000102e6c9c8 clang::MultiplexConsumer::HandleTranslationUnit(clang::ASTContext&) + 52
> 60 clang++                  0x0000000103aa727c clang::ParseAST(clang::Sema&, bool, bool) + 524
> 61 clang++                  0x0000000102e38404 clang::FrontendAction::Execute() + 100
> 62 clang++                  0x0000000102dcc1a8 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 820
> 63 clang++                  0x0000000102ea18d4 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1268
> 64 clang++                  0x0000000100acfe48 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 2012
> 65 clang++                  0x0000000100ace088 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) + 720
> 66 clang++                  0x0000000102c9b104 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1>(long) + 28
> 67 clang++                  0x0000000102628b20 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) + 244
> 68 clang++                  0x0000000102c9ab9c clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const + 232
> 69 clang++                  0x0000000102c7575c clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const + 220
> 70 clang++                  0x0000000102c75bd4 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const + 112
> 71 clang++                  0x0000000102c87858 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) + 224
> 72 clang++                  0x0000000100acd928 main + 8540
> 73 libdyld.dylib            0x0000000185c1df34 start + 4
> clang-13: error: clang frontend command failed with exit code 134 (use -v to see invocation)
> clang version 13.0.0 (https://github.com/llvm/llvm-project.git 5d2ffab5dfeec1cae8c79becd95c917cf7a8c0ea)
> Target: arm64-apple-macos
> Thread model: posix
> InstalledDir: ~/llvm/inst/bin

Change-Id: Ibe023a580e32638af30d05e5e2df383ee9aaecf6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114479
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 35e80904d58d..e3fa28c32298 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7204,9 +7204,11 @@ AC_SUBST([HAVE_GCC_FNO_SIZED_DEALLOCATION])
 
 AC_MSG_CHECKING([whether $CXX_BASE supports a working C++20 consteval])
 dnl ...that does not suffer from <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96994> "Missing code
-dnl from consteval constructor initializing const variable" or
+dnl from consteval constructor initializing const variable",
 dnl <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98752> "wrong 'error: ‘this’ is not a constant
-dnl expression' with consteval constructor":
+dnl expression' with consteval constructor", or <https://bugs.llvm.org/show_bug.cgi?id=50063> "code
+dnl using consteval: 'clang/lib/CodeGen/Address.h:38: llvm::Value*
+dnl clang::CodeGen::Address::getPointer() const: Assertion `isValid()' failed.'":
 AC_LANG_PUSH([C++])
 save_CXXFLAGS=$CXXFLAGS
 CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11"
@@ -7222,6 +7224,15 @@ AC_RUN_IFELSE([AC_LANG_PROGRAM([
             S1 x;
             S2(): x(0) {}
         };
+
+        struct S3 {
+            consteval S3() {}
+            union {
+                int a;
+                unsigned b = 0;
+            };
+        };
+        void f() { S3(); }
     ], [
         return (s.i == 1) ? 0 : 1;
     ])], [