ld: warning: could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog

[MSch]

Got this warning after upgrading to the latest libffi

[zwaldowski]

It's a harmless i386 warning that LLVM/Clang folk have no intention of fixing, from what I've heard. It looks like my changes to the Xcode project undid what I did to inhibit the warning. I'll fix it soon, but in the meantime you can include -Wl,-no_compact_unwind in OTHER_LDFLAGS.

[MarcoTansini]

hi, i cannot silence the warning in the way you suggested, are you talking about the project or target settings?
I'm using it via cocoapods.

Thanks for your work. Marco

[fawkeswei]

Can't silence the warning also, any workarounds?

[zwaldowski]

There's a glitch here with CocoaPods that I'm working on fixing, though I'm confirming with a fresh project right here that -Wl,-no_compact_unwind in the Linker Flags of the linked project (so your app) does inhibit the warning.

[jagreenwood]

The warning showed up for me when libffi was updated to 3.0.13. Forcing CocoaPods to use a previous version inhibited the warning for me. pod 'libffi', '< 3.0.13'

[zwaldowski]

Sorry, there was a bit of a snafu with someone doing something they shouldn't have to the pod spec. 3.0.13 is okay to use again if you pull the spec repo, pod setup.

[hlung]

-Wl,-no_compact_unwind doesn't seem to be a valid flag. I got this error:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: unknown option character `W' in: -Wl,-no_compact_unwind

[fernandospr]

I'm also getting the error using that flag:
unknown option character `W' in: -Wl,-no_compact_unwind

Any workaround?

[duanefields]

This is still a problem for me as well, Xcode 5