struct vs. class in GCC source

[Jason Merrill]

On Tue, Jan 10, 2023 at 9:51 AM Paul Koning via Gcc <gcc@gcc.gnu.org> wrote:

> Building on Mac with Clang I get warnings like this:
>
> ../../../gcc/gcc/cgraph.h:2629:28: warning: struct 'cgraph_edge' was
> previously declared as a class; this is valid, but may result in linker
> errors under the Microsoft C++ ABI [-Wmismatched-tags]
>
> It seems to be talking about a MS bug (since C++ says struct and class
> mean the same thing other than the default access).  Still, I wonder if it
> would be worth changing the code to use just one of "struct" or "class" for
> any given type.  (And then the convention would presumably be that a POD
> type is called "struct" and other types are "class".)
>

Yes, it might be worth adding -Wmismatched-tags to STRICT_WARN.  Is
bootstrapping with VC++ is supported?

Jason