diff options
| -rw-r--r-- | compiler/main/DriverPipeline.hs | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs index 4806a1d004..220fac012b 100644 --- a/compiler/main/DriverPipeline.hs +++ b/compiler/main/DriverPipeline.hs @@ -1680,11 +1680,15 @@ linkBinary dflags o_files dep_packages = do else []) -- '-no_compact_unwind' - -- - C++/Objective-C exceptions cannot use optimised stack - -- unwinding code (the optimised form is the default in Xcode 4 on - -- x86_64). + -- C++/Objective-C exceptions cannot use optimised + -- stack unwinding code. The optimised form is the + -- default in Xcode 4 on at least x86_64, and + -- without this flag we're also seeing warnings + -- like + -- ld: warning: could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog + -- on x86. ++ (if platformOS (targetPlatform dflags) == OSDarwin && - platformArch (targetPlatform dflags) == ArchX86_64 + platformArch (targetPlatform dflags) `elem` [ArchX86, ArchX86_64] then ["-Wl,-no_compact_unwind"] else []) |