gnustep-base-1.6.0 on darwin

[Carl Eugen Hoyos]

I tested gnstep-base-1.6.0 on darwin:

After I changed MFRAME_STRUCT_BYREF, Testing/nsconnection_server works,
and the client at least doesn't crash when passing structs.

With Google, I found the dlcompat library which helps loading dynamic
libraries at runtime: I just changed configure to recognize dladdr:
...
echo $ECHO_N "checking checking if dladdr() is available... $ECHO_C" >&6
  old_LDFLAGS="$LDFLAGS"
  case "$target_os" in
    linux-gnu*) LDFLAGS="$old_LDFLAGS -ldl";;
    solaris*) LDFLAGS="$old_LDFLAGS -ldl";;
    sysv4.2*) LDFLAGS="$old_LDFLAGS -ldl";;
    darwin*) LDFLAGS="$old_LDFLAGS -ldl";;
...
To get a dynamic library (bundle) loaded at runtime, I changed target.make
in section darwin:
BUNDLE_LD       =  /usr/bin/libtool
BUNDLE_LDFLAGS  += -dynamic -flat_namespace -undefined warning
$(ARCH_FLAGS)

Unfortunately, although constructor functions work with cc and gcc,
configure cannot find a symbol called CTOR nor can the library at runtime,
so Testing/nsbundle fails now with:
...
Retreiving principal class...
Error (objc-load): Cannot load objects (no CTOR list)
* ERROR: Can't find principal class

I don't know if that helps, but that's what I found out.
Carl Eugen Hoyos