Linker warning in Xcode 4: Could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog

[sithis]

When building any project using libffi-iphone on Xcode 4 against the simulator, the linker gives the warning "Could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog". Everything seems to still be working fine, but it would be nice to get rid of the warning somehow. You can reproduce the warning by building https://github.com/parmanoir/jscocoa against the iOS Simulator in Xcode 4. The warning only seems to happen when building for the simulator, not the device.

.LFB3 appears in iphonesimulator-darwin.S.

[parmanoir]

This seems to be specific to XCode 4. Google shows Haskell users reporting the same warning. Sorry, I can't fix it - assembly is not my thing. I just copied the code from libffi.

This page has a patch to get rid the warning :
http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg00560.html

When building any project using libffi-iphone on Xcode 4 against the simulator, the linker gives the warning "Could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog". Everything seems to still be working fine, but it would be nice to get rid of the warning somehow. You can reproduce the warning by building https://github.com/parmanoir/jscocoa against the iOS Simulator in Xcode 4. The warning only seems to happen when building for the simulator, not the device.

.LFB3 appears in iphonesimulator-darwin.S.

Reply to this email directly or view it on GitHub:
#1