// tag
#clang
2 posts tagged #clang.
A C++26 structured binding that GCC and Clang disagree about
C++26 lets a structured binding declaration be the condition of an if. GCC 16.1 and Clang 22.1 both implement it and both agree on ordinary structs. Put a tuple-protocol type in the condition and evaluate it at compile time, and GCC rejects the program while Clang accepts it. The reproducer is twenty lines and needs no library.
Clang's lifetimebound warns about a copy, and that is the problem
The lifetimebound attribute lets -Wdangling see through a function call, which is how clang catches a string_view into a temporary. It has no conditional form, so a function that returns a copy on some instantiations and a reference on others has to pick between missing real dangles and warning about correct code. A proposal on the LLVM forum wants to close that gap.