E.g. https://godbolt.org/z/vM6Gxd -----Original Message----- From: Peter Dimov Sent: Tuesday, February 02, 2021 17:01 To: boost@lists.boost.org Subject: Re: [boost] Wrong class export/visibility setting for shared libs in many Boost libs Niall Douglas wrote:

I seem to be having difficulty communicating this to anyone here, so here's a godbolt:

https://godbolt.org/z/jv5Y75

But you've provided a definition for thirdpartylib_nothidden. This is not the case under discussion. The case under discussion is making BOOST_SYMBOL_IMPORT imply _VISIBLE, which translates to a default visibility attribute on the _declaration_ of thirdpartylib_nothidden.