# About the options used for Darwin:
# -dynamiclib
# Apple's way of saying -shared
- # -flat_namespace -undefined suppress:
+ # -undefined dynamic_lookup:
# Without these options, we'd have to specify the correct dependencies
- # for each of the dylibs. Twolevel namespaces are in general a good thing
- # (they make things more robust), so we should fix this sooner or later.
+ # for each of the dylibs. Note that we could (and should) do without this
+ # for all libraries except the RTS; all we need to do is to pass the
+ # correct HSfoo_dyn.dylib files to the link command.
+ # This feature requires Mac OS X 10.3 or later; there is a similar feature,
+ # -flat_namespace -undefined suppress, which works on earlier versions,
+ # but it has other disadvantages.
+ # -single_module
+ # Build the dynamic library as a single "module", i.e. no dynamic binding
+ # nonsense when referring to symbols from within the library. The NCG
+ # assumes that this option is specified (on i386, at least).
+ # -Wl,-macosx_version_min -Wl,10.3
+ # Tell the linker its safe to assume that the library will run on 10.3 or
+ # later, so that it will not complain about the use of the option
+ # -undefined dynamic_lookup above.
# -install_name
# Causes the dynamic linker to ignore the DYLD_LIBRARY_PATH when loading
# this lib and instead look for it at its absolute path.
# When installing the .dylibs (see target.mk), we'll change that path to
- # point to the place they are installed.
- # Note: I'm not yet sure about this, but I think it will be convenient for
- # users not to have to set up DYLD_LIBRARY_PATH to point to the GHC
- # library dir. -- Wolfgang
+ # point to the place they are installed. Therefore, we won't have to set
+ # up DYLD_LIBRARY_PATH specifically for ghc.
$(DYLD_LIBRARY) : $(LIBOBJS) $(STUBOBJS)
- $(CC) -dynamiclib -o $@ $(STUBOBJS) $(LIBOBJS) -flat_namespace -undefined suppress -install_name `pwd`/$@
+ $(CC) -dynamiclib -o $@ $(STUBOBJS) $(LIBOBJS) \
+ -undefined dynamic_lookup -single_module \
+ -Wl,-macosx_version_min -Wl,10.3 \
+ -install_name `pwd`/$@
+
else
DYLD_LIBRARY = $(patsubst %.a,%_dyn.so,$(LIBRARY))