[Bug target/103635] size_t and uintptr_t have wrong sizes with x86_64-w64-mingw32-g++ -mabi=sysv

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103635

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's an explicit instantiation declaration at the end of the header, which
means the entire thing is externally defined in libstdc++.so and the only code
that gets instantiated in your own translation unit is for tiny functions which
are inlined. The rest will refer to the extern template definitions in the
shared library.