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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiler crash when incorrectly define template variable with auto type"
href="https://bugs.llvm.org/show_bug.cgi?id=52005">52005</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Compiler crash when incorrectly define template variable with auto type
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++2b
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fchelnokov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>The code as follows:
```
template <typename T>
auto p = p<T>;
auto x = p<int>;
```
crashes the compiler:
<a href="https://gcc.godbolt.org/z/a99aThzjj">https://gcc.godbolt.org/z/a99aThzjj</a>
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o
/app/output.s -mllvm --x86-asm-syntax=intel -S
--gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics
-fno-crash-diagnostics -std=c++20 -Wall -Wextra -pedantic-errors <source>
1. <eof> parser at end of file
2. <source>:4:6: LLVM IR generation of declaration 'x'
3. <source>:4:6: Generating code for declaration 'x'
#0 0x0000556e3b7a626f PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x0000556e3b7a4130 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x35a4130)
#2 0x0000556e3b6f4b38 CrashRecoverySignalHandler(int)
CrashRecoveryContext.cpp:0:0
#3 0x00007fd94dedf3c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
#4 0x0000556e3ae87c04 llvm::ConstantFP::get(llvm::LLVMContext&, llvm::APFloat
const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x2c87c04)
#5 0x0000556e3ae91adf llvm::Constant::getNullValue(llvm::Type*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2c91adf)
#6 0x0000556e3baeda1d
clang::CodeGen::CodeGenModule::EmitNullConstant(clang::QualType)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x38eda1d)
#7 0x0000556e3bb8daa7
clang::CodeGen::CodeGenModule::EmitGlobalVarDefinition(clang::VarDecl const*,
bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x398daa7)
#8 0x0000556e3bba88f5
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x39a88f5)
#9 0x0000556e3bba913b
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x39a913b)
#10 0x0000556e3bbaeded
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.5289)
CodeGenModule.cpp:0:0
#11 0x0000556e3c7474c1 (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef)
ModuleBuilder.cpp:0:0
#12 0x0000556e3c73ab32
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x453ab32)
#13 0x0000556e3d59f544 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x539f544)
#14 0x0000556e3c7453b2 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x45453b2)
#15 0x0000556e3c0db771 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3edb771)
#16 0x0000556e3c078382
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3e78382)
#17 0x0000556e3c1a8b93
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3fa8b93)
#18 0x0000556e394d71ec cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x12d71ec)
#19 0x0000556e394d325d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#20 0x0000556e3bf1cee5 void llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#21 0x0000556e3b6f5123
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x34f5123)
#22 0x0000556e3bf1ef9e
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d1ef9e)
#23 0x0000556e3bef490a
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3cf490a)
#24 0x0000556e3bef544f
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3cf544f)
#25 0x0000556e3befe885
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x3cfe885)
#26 0x0000556e393e71de main
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x11e71de)
#27 0x00007fd94d98f0b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#28 0x0000556e394d2dda _start
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x12d2dda)
clang-14: error: clang frontend command failed with exit code 139 (use -v to
see invocation)
ASM generation compiler returned: 139</pre>
</div>
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