| Issue |
133252
|
| Summary |
Clang 19.1.7 crash when calling a static template method inside a constructor ---
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
diegonehab
|
# Summary
Clang crashes when compiling a small C++ program that calls a templated static method from a constructor. The crash yields a segmentation fault. Below is the minimal reproduction code, the command line used, and the backtrace.
# Steps to Reproduce
1. Save the following code as `a.cpp`:
```cpp
class A {
public:
A() {
int i = 0;
foo(i);
}
template <typename T>
static auto foo(T t) {
return t;
}
};
int main(void) {
A a{};
return 0;
}
```
2. Compile with Clang (version 19.1.7) using the following command:
```
clang++ -v -std=c++20 -Wall -O0 -g -o a a.cpp
```
3. Observe the segmentation fault and compiler crash.
# Expected Behavior
The code should fail to compile because the deduced return type cannot be used before it is defined.
# Actual Behavior
Clang fails with a segmentation fault and requests that a bug report be filed.
```
clang++ -v -std=c++20 -Wall -O0 -g -o a a.cpp
clang version 19.1.7
Target: arm64-apple-darwin23.5.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-19/bin
"/opt/local/libexec/llvm-19/bin/clang" -cc1 -triple arm64-apple-macosx14.0.0 -Wundef-prefix=TARGET_OS_ -Werror=undef-prefix -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name a.cpp -mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -ffp-contract=on -fno-rounding-math -funwind-tables=1 -target-sdk-version=15.2 -fcompatibility-qualified-id-block-type-checking -fvisibility-inlines-hidden-static-local-var -fdefine-target-os-macros -target-cpu apple-m1 -target-feature +zcm -target-feature +zcz -target-feature +v8.4a -target-feature +aes -target-feature +altnzcv -target-feature +ccdp -target-feature +complxnum -target-feature +crc -target-feature +dotprod -target-feature +fp-armv8 -target-feature +fp16fml -target-feature +fptoint -target-feature +fullfp16 -target-feature +jsconv -target-feature +lse -target-feature +neon -target-feature +pauth -target-feature +perfmon -target-feature +predres -target-feature +ras -target-feature +rcpc -target-feature +rdm -target-feature +sb -target-feature +sha2 -target-feature +sha3 -target-feature +specrestrict -target-feature +ssbs -target-abi darwinpcs -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb -fdebug-compilation-dir=/Users/diego/cartesi/emulator/clang-crash -target-linker-version 1053.12 -v -fcoverage-compilation-dir=/Users/diego/cartesi/emulator/clang-crash -resource-dir /opt/local/libexec/llvm-19/lib/clang/19 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -I/usr/local/include -internal-isystem /opt/local/libexec/llvm-19/bin/../include/c++/v1 -internal-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include -internal-isystem /opt/local/libexec/llvm-19/lib/clang/19/include -internal-externc-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -O0 -Wall -std=c++20 -fdeprecated-macro -ferror-limit 19 -stack-protector 1 -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fmax-type-align=16 -fcolor-diagnostics -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/folders/c1/9gdm_twx72q20qy1qy3bcqvr0000gn/T/a-c9f6e1.o -x c++ a.cpp
clang -cc1 version 19.1.7 based upon LLVM 19.1.7 default target arm64-apple-darwin23.5.0
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/opt/local/libexec/llvm-19/bin/../include/c++/v1
/opt/local/libexec/llvm-19/lib/clang/19/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory)
End of search list.
a.cpp:5:9: error: cannot compile this l-value _expression_ yet
5 | foo(i);
| ^~~
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/local/libexec/llvm-19/bin/clang -cc1 -triple arm64-apple-macosx14.0.0 -Wundef-prefix=TARGET_OS_ -Werror=undef-prefix -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name a.cpp -mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -ffp-contract=on -fno-rounding-math -funwind-tables=1 -target-sdk-version=15.2 -fcompatibility-qualified-id-block-type-checking -fvisibility-inlines-hidden-static-local-var -fdefine-target-os-macros -target-cpu apple-m1 -target-feature +zcm -target-feature +zcz -target-feature +v8.4a -target-feature +aes -target-feature +altnzcv -target-feature +ccdp -target-feature +complxnum -target-feature +crc -target-feature +dotprod -target-feature +fp-armv8 -target-feature +fp16fml -target-feature +fptoint -target-feature +fullfp16 -target-feature +jsconv -target-feature +lse -target-feature +neon -target-feature +pauth -target-feature +perfmon -target-feature +predres -target-feature +ras -target-feature +rcpc -target-feature +rdm -target-feature +sb -target-feature +sha2 -target-feature +sha3 -target-feature +specrestrict -target-feature +ssbs -target-abi darwinpcs -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb -fdebug-compilation-dir=/Users/diego/cartesi/emulator/clang-crash -target-linker-version 1053.12 -v -fcoverage-compilation-dir=/Users/diego/cartesi/emulator/clang-crash -resource-dir /opt/local/libexec/llvm-19/lib/clang/19 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -I/usr/local/include -internal-isystem /opt/local/libexec/llvm-19/bin/../include/c++/v1 -internal-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include -internal-isystem /opt/local/libexec/llvm-19/lib/clang/19/include -internal-externc-isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -O0 -Wall -std=c++20 -fdeprecated-macro -ferror-limit 19 -stack-protector 1 -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fmax-type-align=16 -fcolor-diagnostics -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/folders/c1/9gdm_twx72q20qy1qy3bcqvr0000gn/T/a-c9f6e1.o -x c++ a.cpp
1. <eof> parser at end of file
2. Per-file LLVM IR generation
3. a.cpp:3:5: Generating code for declaration 'A::A'
4. a.cpp:3:9: LLVM IR generation of compound statement ('{}')
#0 0x00000001116d2d14 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/local/libexec/llvm-19/lib/libLLVM.dylib+0x14ed14)
#1 0x00000001116d0f28 llvm::sys::RunSignalHandlers() (/opt/local/libexec/llvm-19/lib/libLLVM.dylib+0x14cf28)
#2 0x00000001116d33d0 SignalHandler(int) (/opt/local/libexec/llvm-19/lib/libLLVM.dylib+0x14f3d0)
#3 0x0000000198ceb584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
#4 0x0000000106b2c02c arrangeFreeFunctionLikeCall(clang::CodeGen::CodeGenTypes&, clang::CodeGen::CodeGenModule&, clang::CodeGen::CallArgList const&, clang::FunctionType const*, unsigned int, bool) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x151402c)
#5 0x0000000106bf2108 clang::CodeGen::CodeGenFunction::EmitCall(clang::QualType, clang::CodeGen::CGCallee const&, clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::Value*) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x15da108)
#6 0x0000000106bf1304 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x15d9304)
#7 0x0000000106c34dec (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x161cdec)
#8 0x0000000106c24674 clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x160c674)
#9 0x0000000106bd65dc clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr const*, clang::CodeGen::AggValueSlot, bool) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x15be5dc)
#10 0x0000000106bd642c clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x15be42c)
#11 0x0000000106d13a70 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x16fba70)
#12 0x0000000106d14a40 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x16fca40)
#13 0x0000000106d1399c clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x16fb99c)
#14 0x0000000106b482e4 clang::CodeGen::CodeGenFunction::EmitConstructorBody(clang::CodeGen::FunctionArgList&) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x15302e4)
#15 0x0000000106d77990 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x175f990)
#16 0x0000000106b2737c clang::CodeGen::CodeGenModule::codegenCXXStructor(clang::GlobalDecl) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x150f37c)
#17 0x0000000106e1bcf0 (anonymous namespace)::ItaniumCXXABI::emitCXXStructor(clang::GlobalDecl) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x1803cf0)
#18 0x0000000106d919bc clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x17799bc)
#19 0x0000000106d85d9c clang::CodeGen::CodeGenModule::EmitDeferred() (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x176dd9c)
#20 0x0000000106d85db4 clang::CodeGen::CodeGenModule::EmitDeferred() (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x176ddb4)
#21 0x0000000106d837ec clang::CodeGen::CodeGenModule::Release() (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x176b7ec)
#22 0x0000000106e370a8 (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x181f0a8)
#23 0x0000000106d69870 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x1751870)
#24 0x00000001057e5a30 clang::ParseAST(clang::Sema&, bool, bool) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x1cda30)
#25 0x000000010784e408 clang::FrontendAction::Execute() (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x2236408)
#26 0x00000001077d31d8 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x21bb1d8)
#27 0x00000001078cd7bc clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/local/libexec/llvm-19/lib/libclang-cpp.dylib+0x22b57bc)
#28 0x0000000100afd9c4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/local/libexec/llvm-19/bin/clang+0x1000099c4)
#29 0x0000000100afb018 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) (/opt/local/libexec/llvm-19/bin/clang+0x100007018)
#30 0x0000000100afa44c clang_main(int, char**, llvm::ToolContext const&) (/opt/local/libexec/llvm-19/bin/clang+0x10000644c)
#31 0x0000000100b06470 main (/opt/local/libexec/llvm-19/bin/clang+0x100012470)
#32 0x00000001989320e0
clang++: error: unable to execute command: Segmentation fault: 11
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 19.1.7
Target: arm64-apple-darwin23.5.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-19/bin
clang++: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /var/folders/c1/9gdm_twx72q20qy1qy3bcqvr0000gn/T/a-7ca65a.cpp
clang++: note: diagnostic msg: /var/folders/c1/9gdm_twx72q20qy1qy3bcqvr0000gn/T/a-7ca65a.sh
clang++: note: diagnostic msg: Crash backtrace is located in
clang++: note: diagnostic msg: /Users/diego/Library/Logs/DiagnosticReports/clang_<YYYY-MM-DD-HHMMSS>_<hostname>.crash
clang++: note: diagnostic msg: (choose the .crash file that corresponds to your crash)
clang++: note: diagnostic msg:
********************
```
# Additional Details
- **Clang version**: 19.1.7
- **Target**: arm64-apple-darwin23.5.0
- **Compile flags**: `-v -std=c++20 -Wall -O0 -g`
# Attachments
Preprocessed source file, run script, crash back-trace, as requested.
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