As a recent bug pointed out, you really only want to link libraries you actually need because the others could export functions that you don't want and interfere. Rather than relying a GCC only feature, this takes the good old fashioned approach: filtering out the libraries you don't need.
Attached is a patch which applies this filtering to the backend and has the same results as linking with --as-needed. I basically took the filter list of libpq and altered it as follows: libs removed: -lnsl -lresolv libs added: -ldl -lm Incidently, the libs removed don't appear to be needed by anything in any file in the source, so I wonder if they're even required. This probably needs a bit of testing on a few different architechtures to make sure it works. I also only apply it to the non-windows, non-aix case since the building requirements there are different enough that someone with such a platforn should do it. Have a nice day, -- Martijn van Oosterhout <email@example.com> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
Index: src/backend/Makefile =================================================================== RCS file: /projects/cvsroot/pgsql/src/backend/Makefile,v retrieving revision 1.110 diff -u -r1.110 Makefile --- src/backend/Makefile 27 Oct 2005 20:45:29 -0000 1.110 +++ src/backend/Makefile 27 Nov 2005 19:40:09 -0000 @@ -40,8 +40,11 @@ ifneq ($(PORTNAME), win32) ifneq ($(PORTNAME), aix) +# Filter out libraries we don't need +BACKEND_LIBS=$(filter -ldes -lcom_err -lcrypto -lk5crypto -lkrb5 -lssl -lsocket -lintl -lcrypt -ldl -lm, $(LIBS)) + postgres: $(OBJS) - $(CC) $(CFLAGS) $(LDFLAGS) $(export_dynamic) $^ $(LIBS) -o $@ + $(CC) $(CFLAGS) $(LDFLAGS) $(export_dynamic) $^ $(BACKEND_LIBS) -o $@ endif endif
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