Errors when building SDL3 on Cygwin

[TrueCat17]

When I run cmake .. -G "Unix Makefiles" (even though no more parameters are passed) I get errors about not being able to find dev libs for alsa, x11 and wayland, although obviously they shouldn't be looked for on Windows

I'm guessing that Cygwin is considered in CMakeLists.txt as UNIX (line 1775) and not as WINDOWS (line 2166)
BTW, the line 1851 looks suspicious, because it seems to be a duplicate condition

Maybe it will be useful:

• SDL: 3.4.4;
• OS: win7 x32;
• Cygwin: 3.3.6-341;
• gcc (export CC="i686-pc-cygwin-gcc"): 11.3;
• CMake: 3.23.2-1;
• make: 4.3-1.

conf_err.txt

conf_out.txt

[madebr]

In #7403, I attempted to add cygwin support (for completeness sake, not because I am an actual user).
Since you have a working development environment, and hopefully are serious about this, can you please apply the appropriate changes from that pr to current main to get it working, and create a pr?
If you encounter blocking problems, feel free to ask us here.

Thanks!

[TrueCat17]

I fixed the SDL3 building, but there is no way to check it (on my project) yet, because there were also problems with SDL_ttf, so a PR will come later