cmake: list chosen audio/video/etc targets at the end of the output #7922
Description
This is kind of silly and not urgent, but the old configure script had a super useful feature I really miss: it showed you the list of backends it was planning to build at the end of the output:
SDL2 Configure Summary:
Building Shared Libraries
Building Static Libraries
Enabled modules : atomic audio video render events joystick haptic hidapi sensor power filesystem threads timers file misc locale loadso cpuinfo assembly
Assembly Math : mmx 3dnow sse sse2 sse3
Audio drivers : disk dummy oss alsa(dynamic) pipewire(dynamic) pulse(dynamic) jack(dynamic) nas(dynamic) sndio(dynamic)
Video drivers : dummy offscreen x11(dynamic) kmsdrm(dynamic) opengl opengl_es1 opengl_es2 vulkan wayland(dynamic)
X11 libraries : xcursor xdbe xinput2 xinput2_multitouch xfixes xrandr xscrnsaver xshape
Input drivers : linuxev linuxkd
Enable virtual joystick APIs : YES
Using libsamplerate : YES
Using libudev : YES
Using dbus : YES
Using ime : YES
Using ibus : YES
Using fcitx : YES
The CMake output probably has all this information, but it's hard to pull it out of the "Options:" section at a quick glance.
I don't need all this information from the configure script, but the "Audio drivers" and "Video drivers" lines would be a massive improvement, for the "oh, this isn't building Wayland support? I must have forgotten a development package" moments.
(CMake does report the enabled modules, but I'm still lobbying for removing the ability to turn them off in SDL3. :) )
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