https://bugs.llvm.org/show_bug.cgi?id=49742
Bug ID: 49742
Summary: Constexpr variable template constructor initializing
flexible array member crashes compiler
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Created attachment 24699
--> https://bugs.llvm.org/attachment.cgi?id=24699&action=edit
Compiler crash backtrace
See attachment for compiler backtrace.
Affected versions:
Note: The issue seems to have been fixed in trunk already.
- 11.0.1
- 11.0.0
- 10.0.1
- 10.0.0
- 9.0.1
- 9.0.0
- 8.0.1
- 8.0.0
- 7.1.0
- 7.0.0
Driver cmdline:
Note: For versions that do not support -std=c++20, -std=c++2a was used.
clang++ -Xclang -disable-llvm-passes -std=c++20
Note: The original code has been reduced with creduce.
Reduced code:
struct a {
int b[];
template <typename... c> constexpr a(c... e) : b{e...} {}
};
int main() { constexpr a d{4}; }
Original code:
template<typename T>
struct S {
T t[];
template<typename... Args>
constexpr S(Args... args) noexcept :
t{args...}
{}
};
int main() {
constexpr const S<int> s{1, 2, 3, 4};
}
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