Rio 0.4.9, 0.4.10 will not start on macOS 10.15 (Catalina) with "symbol not found: _kCGColorSpaceExtendedDisplayP3" error

[ashugg]

Hi! Rio Terminal 0.4.x ran on macOS 10.15 (Catalina) up to and including version 0.4.8, which reports its version info as "Version 0.5.0-nightly (0.5.0-nightly.20260614112018)" as I assume something went wrong with that release process. Releases 0.4.9 and 0.4.10 cannot launch, but do not show the crossed-out application icon, and do not have the error message "You can't use this version of the application ... with this version of macOS."

If it was intentional that macOS 10.15 support be dropped, it wasn't mentioned in the Changelog that I can see.

The error on launch is:

dyld: Symbol not found: _kCGColorSpaceExtendedDisplayP3
  Referenced from: /Users/andrew/Applications/rio.app/Contents/MacOS/./rio
  Expected in: /System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
 in /Users/andrew/Applications/rio.app/Contents/MacOS/./rio
Abort trap: 6              ./rio

As v0.4.9 brought in wgpu v30.0.0 and librashader v0.12, I wonder if this is what broke Rio for me?

[raphamorim]

Thanks for the detailed report, and your suspicion is right: it's the wgpu 30 upgrade that landed in 0.4.9.

wgpu 30 added HDR surface color space support, and its metal backend now links kCGColorSpaceExtendedDisplayP3 (plus the ITUR_2100 constants) directly. Those symbols only exist on macOS 11+, and since dyld resolves them at launch, Rio aborts on Catalina before main() even runs, despite never actually using those code paths.

This is already fixed upstream (gfx-rs/wgpu#9819 and gfx-rs/wgpu#9833) but not in any release yet, only on trunk, which will become wgpu 31. So the fix here is either waiting for wgpu 31 or a 30.x backport. Will keep this issue open until Rio ships with a fixed wgpu.

Dropping Catalina was not intentional, btw. The 0.4.8 binary reporting itself as 0.5.0-nightly looks like a release pipeline hiccup, will look at that separately.

[ashugg]

Thanks, Raphael. I'll leave Rio 0.4.7 or 0.4.8 on my Catalina system and wait for wgpu 31 to be released and then appear in a subsequent Rio release.

[raphamorim]

Thank you and sorry for the inconvenience 🙏