On Tuesday, 3 July 2018 at 18:35:43 UTC, kinke wrote:
On Tuesday, 3 July 2018 at 17:54:08 UTC, Seb wrote:
[...]

AFAICT, the issue is that MinGW is used, as opposed to MinGW-w64 (a confusingly separate project unfortunately AFAIK). There's no SetWindowLongPtr for Win32, it's #defined as SetWindowLong. The 64-bit user32.def of MinGW-w64 contains it [1], while it's missing in the MinGW .def file [3] and the 32-bit MinGW-w64 one [2].

[1] https://sourceforge.net/p/mingw-w64/code/HEAD/tree/trunk/mingw-w64-crt/lib64/user32.def [2] https://sourceforge.net/p/mingw-w64/code/HEAD/tree/trunk/mingw-w64-crt/lib32/user32.def [3] https://sourceforge.net/p/mingw/mingw-org-wsl/ci/5.0-active/tree/w32api/lib/user32.def

What are next steps then?

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