error compiling dune-windows (OCaml 5.1.1) about opam-cross-windows HOT 3 CLOSED

Thanks for the report! dune-windows is only required if you need any of the dune libraries. For building and such, you only need the native host dune.

That being said, something is wrong with the cross-compilation configuration. Could you describe what system you are building on and how you installed mingw-w64? Thanks!

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Oh, I hadn't even realized that it would use a cross-compiler already installed in my system, I thought it would install everything by itself!

I'm using Fedora 38, I installed mingw64 a while ago using Fedora's dnf (I have several mingw64-* dnf packages installed). For completeness, here's the final part of opam's log, indicating the issue are the chk functions:

** Cannot resolve symbols for /usr/x86_64-w64-mingw32/sys-root/mingw/lib/libws2_32.a(lib64_libws2_32_a-WspiapiLegacyGetNameInfo.o/
lib64_libws2_32_a-WspiapiLoad.o/
lib64_libws2_32_a-WspiapiGetAddrInfo.o/
lib64_libws2_32_a-WspiapiGetNameInfo.o/
lib64_libws2_32_a-WspiapiFreeAddrInfo.o/

):
 __chk_fail
** Cannot resolve symbols for /usr/x86_64-w64-mingw32/sys-root/mingw/lib/libws2_32.a(lib64_libws2_32_a-WspiapiLoad.o/
lib64_libws2_32_a-WspiapiGetAddrInfo.o/
lib64_libws2_32_a-WspiapiGetNameInfo.o/
lib64_libws2_32_a-WspiapiFreeAddrInfo.o/

):
 __strcat_chk
 __strcpy_chk

There are newer mingw64 packages in Fedora 39 and 40 (mine is mingw64-crt-10.0.0-4.fc38.noarch; there are mingw64-crt-11.0.0-2.fc39.noarch and mingw64-crt-11.0.1-3.fc40.noarch), so probably upgrading it could fix the issue.

I don't know when I'll have time to upgrade it, though, so in the meanwhile it might be better to close this issue, and I'll reopen if it still happens with a newer mingw64 (and if I do need dune-windows).

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Ok!

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