[clang] SIGSEGV when evaluating __is_literal for a union with a declarator and a member
Open
Nobody has claimed this yet.
clang:frontend
crash-on-invalid
generated by fuzzer
regression:20
- Dominant language
- LLVM
- Stars
- 40.5k
- Forks
- 18.7k
- PR merge metrics
- PR metrics pending
Description
Reproducer:
https://godbolt.org/z/9eGYcc6qx
struct S {
~S() {}
};
union U {
S s;
U :;
};
static_assert(__is_literal(U), "");
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the C++ reproducer from the issue, using the linked Compiler Explorer example to confirm the SIGSEGV while evaluating __is_literal for the union. Trace Clang's handling of the union declaration and builtin evaluation, then add a regression test using this reproducer and verify that compilation no longer crashes.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100