diff options
Diffstat (limited to 'compiler/GHC/SysTools/Info.hs')
| -rw-r--r-- | compiler/GHC/SysTools/Info.hs | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/compiler/GHC/SysTools/Info.hs b/compiler/GHC/SysTools/Info.hs index ca16146771..7a0884e26f 100644 --- a/compiler/GHC/SysTools/Info.hs +++ b/compiler/GHC/SysTools/Info.hs @@ -136,7 +136,8 @@ getLinkerInfo' logger dflags = do -- Darwin has neither GNU Gold or GNU LD, but a strange linker -- that doesn't support --version. We can just assume that's -- what we're using. - return $ DarwinLD [] + -- See Note [Dynamic lookup and chained fixups] + return $ DarwinLD [Option "-Wl,-no_fixup_chains"] OSMinGW32 -> -- GHC doesn't support anything but GNU ld on Windows anyway. -- Process creation is also fairly expensive on win32, so @@ -236,3 +237,27 @@ getCompilerInfo' logger pgm = do text "Make sure you're using GNU gcc, or clang" return UnknownCC ) + +{- +Note [Dynamic lookup and chained fixups] +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Recent versions of MacOS use a version of ld where `-fixup_chains` is on by default. +This is incompatible with our usage of `-undefined dynamic_lookup`. Therefore we +explicitly disable `fixup_chains` by passing `-no_fixup_chains` to the linker on +darwin. This results in a warning of the form: + +ld: warning: -undefined dynamic_lookup may not work with chained fixups + +The manual explains the incompatible nature of these two flags: + + -undefined treatment + Specifies how undefined symbols are to be treated. Options are: error, warning, + suppress, or dynamic_lookup. The default is error. Note: dynamic_lookup that + depends on lazy binding will not work with chained fixups. + +A relevant ticket is #22429 + +-} + + |