Date: Sun, 7 Dec 1997 11:18:57 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: John Birrell <jb@freebsd1.cimlogic.com.au> Cc: Nate Williams <nate@mt.sri.com>, tlambert@primenet.com, jkh@time.cdrom.com, mike@smith.net.au, hsu@freebsd.org, hackers@hub.freebsd.org Subject: Re: shared library with static Motif? Message-ID: <Pine.BSF.3.95q.971207111531.1629B-100000@herring.nlsystems.com> In-Reply-To: <199712070015.LAA01594@freebsd1.cimlogic.com.au>
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On Sun, 7 Dec 1997, John Birrell wrote: > Nate Williams wrote: > > But, aside from legalities the real issue hasn't been answered. Is it > > *technically* possible to link in a 'static' library into a 'shared' > > library so that the end-user doesn't need a Motif library to get access > > to the shared library? > > Yes (I think 8-). You still use ld -Bshareable so that you get a shared > object, but you list the Motif static libraries with the objects that you > link into your shared library. The linker (should) then resolve all Motif > references in your shared library, leaving the X11 ones as external > references to the X shared libraries. > > Just don't use the -l option to search for libraries because ld will > try to translate these to shared libraries. Use an explicit reference > like /usr/lib/X11/libXm.a The problem with linking a dynamic library with a static one is that the object files in the static lib will not normally be compiled with -fpic and so the resulting shared object will have a lot of text relocations. This will still work but will not share particularly well since the runtime linker will have to write into the text section to fix the text relocations. The normal solution to this is to have a static lib containing PIC objects (e.g. /usr/lib/libc_pic.a). -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 951 1891 Fax: +44 181 381 1039
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