[llvm-bugs] [Bug 49396] New: Clang crashed in llvm-project/llvm/include/llvm/ADT/Optional.h:197: T& llvm::optional_detail::OptionalStorage<T, true>::getValue() & [with T = llvm::AliasResult]: Assertion `hasVal' failed
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Mar 2 05:43:54 PST 2021
https://bugs.llvm.org/show_bug.cgi?id=49396
Bug ID: 49396
Summary: Clang crashed in
llvm-project/llvm/include/llvm/ADT/Optional.h:197: T&
llvm::optional_detail::OptionalStorage<T,
true>::getValue() & [with T = llvm::AliasResult]:
Assertion `hasVal' failed
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedbugs at nondot.org
Reporter: haoxintu at gmail.com
CC: llvm-bugs at lists.llvm.org
Hi all.
This program makes clang-trunk crash under O2~Os options.
$cat small.c
#include <stdint.h>
void a() {
uint64_t *b;
uint64_t *c;
uint32_t d;
uint64_t *e;
if (*c) {
for (; e <= 7; e++) {
int64_t f = 0;
c = f;
}
if (*e /= e <= c) {
uint64_t g;
for (d = 7; d;) {
uint32_t *j = &d;
i:
(*j = g) != (*c ?: d ?: *b == 0);
if (d = c > 0)
g = 0;
}
}
for (; d;)
;
}
goto i;
}
$clang -c -w -O2 small.c
clang:
/home/haoxin/haoxin-data/dut-research/compilers/llvm-project/llvm/include/llvm/ADT/Optional.h:197:
T& llvm::optional_detail::OptionalStorage<T, true>::getValue() & [with T =
llvm::AliasResult]: Assertion `hasVal' failed.
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: clang -c -w -O2 small.c
1. <eof> parser at end of file
2. Optimizer
#0 0x000055f89bec1b7c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x33fbb7c)
#1 0x000055f89bebf7b4 llvm::sys::RunSignalHandlers()
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x33f97b4)
#2 0x000055f89bebfa4b llvm::sys::CleanupOnSignal(unsigned long)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x33f9a4b)
#3 0x000055f89be1e998 CrashRecoverySignalHandler(int)
CrashRecoveryContext.cpp:0:0
#4 0x00007f3a57158980 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
#5 0x00007f3a55d80fb7 raise
/build/glibc-S9d2JN/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#6 0x00007f3a55d82921 abort /build/glibc-S9d2JN/glibc-2.27/stdlib/abort.c:81:0
#7 0x00007f3a55d7248a __assert_fail_base
/build/glibc-S9d2JN/glibc-2.27/assert/assert.c:89:0
#8 0x00007f3a55d72502 (/lib/x86_64-linux-gnu/libc.so.6+0x30502)
#9 0x000055f89ae49010 llvm::BasicAAResult::aliasPHI(llvm::PHINode const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2383010)
#10 0x000055f89ae491d1 llvm::BasicAAResult::aliasCheckRecursive(llvm::Value
const*, llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&, llvm::Value
const*, llvm::Value const*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23831d1)
#11 0x000055f89ae4614b llvm::BasicAAResult::aliasCheck(llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x238014b)
#12 0x000055f89ae466db llvm::BasicAAResult::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23806db)
#13 0x000055f89ae1e38b llvm::AAResults::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x235838b)
#14 0x000055f89ae489f2 llvm::BasicAAResult::aliasPHI(llvm::PHINode const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23829f2)
#15 0x000055f89ae491d1 llvm::BasicAAResult::aliasCheckRecursive(llvm::Value
const*, llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&, llvm::Value
const*, llvm::Value const*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23831d1)
#16 0x000055f89ae4614b llvm::BasicAAResult::aliasCheck(llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::Value const*,
llvm::LocationSize, llvm::AAMDNodes const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x238014b)
#17 0x000055f89ae466db llvm::BasicAAResult::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23806db)
#18 0x000055f89ae1e38b llvm::AAResults::alias(llvm::MemoryLocation const&,
llvm::MemoryLocation const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x235838b)
#19 0x000055f89ae1ff02 llvm::AAResults::getModRefInfo(llvm::StoreInst const*,
llvm::MemoryLocation const&, llvm::AAQueryInfo&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2359f02)
#20 0x000055f89ae2005e llvm::AAResults::getModRefInfo(llvm::StoreInst const*,
llvm::MemoryLocation const&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x235a05e)
#21 0x000055f89af3fbfa llvm::FindAvailablePtrLoadStore(llvm::Value*,
llvm::Type*, bool, llvm::BasicBlock*,
llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true,
false, void>, false, false>&, unsigned int, llvm::AAResults*, bool*, unsigned
int*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2479bfa)
#22 0x000055f89af41132 llvm::FindAvailableLoadedValue(llvm::LoadInst*,
llvm::BasicBlock*,
llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true,
false, void>, false, false>&, unsigned int, llvm::AAResults*, bool*, unsigned
int*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x247b132)
#23 0x000055f89bc1c8c5
llvm::JumpThreadingPass::simplifyPartiallyRedundantLoad(llvm::LoadInst*)
(.part.785) JumpThreading.cpp:0:0
#24 0x000055f89bc231ec llvm::JumpThreadingPass::processBlock(llvm::BasicBlock*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x315d1ec)
#25 0x000055f89bc23dbe llvm::JumpThreadingPass::runImpl(llvm::Function&,
llvm::TargetLibraryInfo*, llvm::LazyValueInfo*, llvm::AAResults*,
llvm::DomTreeUpdater*, bool, std::unique_ptr<llvm::BlockFrequencyInfo,
std::default_delete<llvm::BlockFrequencyInfo> >,
std::unique_ptr<llvm::BranchProbabilityInfo,
std::default_delete<llvm::BranchProbabilityInfo> >)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x315ddbe)
#26 0x000055f89bc25244 llvm::JumpThreadingPass::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x315f244)
#27 0x000055f89ce482e1 llvm::detail::PassModel<llvm::Function,
llvm::JumpThreadingPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x43822e1)
#28 0x000055f89b6cad45 llvm::PassManager<llvm::Function,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2c04d45)
#29 0x000055f899d8e801 llvm::detail::PassModel<llvm::Function,
llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function> >,
llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>
>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x12c8801)
#30 0x000055f89ae89308
llvm::CGSCCToFunctionPassAdaptor::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23c3308)
#31 0x000055f899d8f151 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::CGSCCToFunctionPassAdaptor, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x12c9151)
#32 0x000055f89ae8192a llvm::PassManager<llvm::LazyCallGraph::SCC,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23bb92a)
#33 0x000055f89b7c9d51 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::PassManager<llvm::LazyCallGraph::SCC,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2d03d51)
#34 0x000055f89ae853a6
llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23bf3a6)
#35 0x000055f89b7c9d11 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::DevirtSCCRepeatedPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2d03d11)
#36 0x000055f89ae832f7
llvm::ModuleToPostOrderCGSCCPassAdaptor::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x23bd2f7)
#37 0x000055f89b7c9d91 llvm::detail::PassModel<llvm::Module,
llvm::ModuleToPostOrderCGSCCPassAdaptor, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2d03d91)
#38 0x000055f89b6c9155 llvm::PassManager<llvm::Module,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2c03155)
#39 0x000055f89b7ccabf llvm::ModuleInlinerWrapperPass::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2d06abf)
#40 0x000055f89ce49b31 llvm::detail::PassModel<llvm::Module,
llvm::ModuleInlinerWrapperPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x4383b31)
#41 0x000055f89b6c9155 llvm::PassManager<llvm::Module,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x2c03155)
#42 0x000055f89c17dd4b (anonymous
namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >) BackendUtil.cpp:0:0
#43 0x000055f89c182045 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x36bc045)
#44 0x000055f89cde8c3b
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x4322c3b)
#45 0x000055f89d948409 clang::ParseAST(clang::Sema&, bool, bool)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x4e82409)
#46 0x000055f89cde79b8 clang::CodeGenAction::ExecuteAction()
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x43219b8)
#47 0x000055f89c781e09 clang::FrontendAction::Execute()
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3cbbe09)
#48 0x000055f89c71f7a1
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3c597a1)
#49 0x000055f89c849ab0
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3d83ab0)
#50 0x000055f899afcb34 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x1036b34)
#51 0x000055f899af9097 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#52 0x000055f89c5d56a5 void llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#53 0x000055f89be1eb12
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3358b12)
#54 0x000055f89c5d69ec
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
>, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >*, bool*) const (.part.186) Job.cpp:0:0
#55 0x000055f89c5aebc9
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3ae8bc9)
#56 0x000055f89c5af6a7
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3ae96a7)
#57 0x000055f89c5b8509
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x3af2509)
#58 0x000055f899a2895e main
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0xf6295e)
#59 0x00007f3a55d63bf7 __libc_start_main
/build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:344:0
#60 0x000055f899af8b1a _start
(/media/haoxin/SeagateData/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin/clang-13+0x1032b1a)
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
7fb400112f6c41fc98ee5d584cdc0dfe76393a25)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin
clang-13: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/small-ff86e5.c
clang-13: note: diagnostic msg: /tmp/small-ff86e5.sh
clang-13: note: diagnostic msg:
********************
$clang -v
clang version 13.0.0 (https://github.com/llvm/llvm-project
7fb400112f6c41fc98ee5d584cdc0dfe76393a25)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/haoxin/haoxin-data/dut-research/compilers/llvm-project/build-20210228/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Candidate multilib: .;@m64
Selected multilib: .;@m64
Thanks.
Haoxin
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