Re: readline with shared libraries on Mac OS X/Darwin

[David R. Morrison]

Chet Ramey wrote:

> > We've noticed a problem with the darwin|macosx "stanza" in the shobj-conf
> > file in readline.  In Darwin, the shared library command requires a bunch
> > of flags which are unknown on ELF and other systems.  The flag giving
> > trouble is Darwin's -install_name flag.
> > 
> > Whoever wrote this stanza (and it may well have been Fink's founder, chrisp,
> > who is no longer with the project), wrote
> >   -install_name $(libdir)/$@
> > and when this is actually used (in the current version, say), $@ expands to
> > libreadline.4.3.dylib or libhistory.4.3.dylib.  However, what we need it to
> > expand to is libreadline.4.dylib or libhistory.4.dylib.  In other words, it
> > should show the filename with only the major version number present, not
> > the minor version number.
> 
> You should be able to do what you want by changing the assignment to
> SHLIB_LIBVERSION in the darwin/macosx stanza.  If you make it look like
> 
> SHLIB_LIBVERSION='$(SHLIB_MAJOR).$(SHLIB_LIBSUFF)'
> 
> the makefile will create libreadline.4.dylib and libhistory.4.dylib as
> targets and `$@' will expand to what you want.

That didn't quite work, becuase the wrong targets were created and the
linking routine got messed up.  But it did lead me to a good solution,
borrowing code from the definition of LINK2 in support/shlib-install.

Appended below is a patch for readline-4.3 which causes the readline
libraries to be created with the correct -install_name flag in
darwin/macosx.  

  -- Dave



diff -ru readline-4.3/support/shobj-conf readline-4.3-patched/support/shobj-conf
--- readline-4.3/support/shobj-conf     Wed Apr 17 10:27:46 2002
+++ readline-4.3-patched/support/shobj-conf     Sat Aug  3 09:20:01 2002
@@ -146,7 +146,7 @@
        SHLIB_LIBSUFF='dylib'
 
        SHOBJ_LDFLAGS='-dynamic'
-       SHLIB_XLDFLAGS='-arch_only `/usr/bin/arch` -install_name $(libdir)/$@ 
-current_version $(SHLIB_MAJOR)$(SHLIB_MINOR) -compatibility_version 
$(SHLIB_MAJOR) -v'
+       SHLIB_XLDFLAGS='-arch_only `/usr/bin/arch` -install_name 
$(libdir)/`echo $@ | sed "s:\\(.*\\.[0-9]\\)\\.[0-9]:\\1:"` -current_version 
$(SHLIB_MAJOR)$(SHLIB_MINOR) -compatibility_version $(SHLIB_MAJOR) -v'
 
        SHLIB_LIBS='-lSystem'
        ;;