Question: has clang __PRETTY_FUNCTION__ behavior changed in clang 16.0.0 ?

[dkrejsa]

Hi,

This is a question relating to the experimental/type_name.hpp implementation with Clang.

I'm using Boost 1.81 and seeing a compilation failure building the hana experimental/type_name test using Clang 16.0.0, albeit in a cross-build environment for VxWorks. I build with -std=c++14.

Part of the issue seems to be that for the boost::hana::experimental::detail::type_name_impl2<int>() function, clang is yielding

"cstring boost::hana::experimental::detail::type_name_impl2() [T = int]"

for __PRETTY_FUNCTION__, rather than yielding

"boost::hana::experimental::detail::cstring boost::hana::experimental::detail::type_name_impl2() [T = int]"

as type_name.hpp seems to expect. That is, the "cstring" return type in the __PRETTY_FUNCTION__ I see omits the namespace path "boost::hana::experimental::detail::".

Is this something new with Clang 16.0.0, or is it perhaps an issue of some option affecting the compiler behavior, that might be different in my environment? Any advice appreciated.

[dkrejsa]

Here's an example on godbolt, with Clang 16.0.0

https://godbolt.org/z/3rbaf4Ynv

and with Clang 15.0.0

https://godbolt.org/z/9P7eeWh8a

OK, I was worried this might be restricted to my environment, but it seems to be more general.