alt Hacker News> How does a library writer testing that their library works with a specific version of a compiler that was already released have anything to do with a compiler implementation providing special treatment for that library?
Not special treatment for the library, but the library being able to assume that specific UB handling in certain existing compiler versions exists, can be relied on, and is compatible with the library's assumptions of such behavior, as long as those are the only versions they officially "support."
Here is the original statement about special treatment:
"It was originally created by Microsoft and as Herb mentions "all our target platforms", so most likely it gets special treatment."
My claim is that Microsoft is not giving any special treatment to the GSL... the GSL is written using functionality that is officially available to any third party library, and hence not special.
Are you disputing this? If so then what is the special treatment you're claiming that Microsoft is giving to GSL or what special treatment is GSL making use of?