Solved! MacOS X and external functions

Tom Lane sez:
} Gregory Seidman <gss+pg(at)cs(dot)brown(dot)edu> writes:
} > Has anyone managed to get external functions working under MacOS X?
}
} FWIW, if the regression tests pass for you then external functions
} should work. plpgsql is a dynamically loaded library, and the
} regression tests also build and execute a couple of external functions
} from contrib/.

I tried the regression tests and the external function test passed, so I
looked into what the test was actually doing. It turns out that the issue
is with MacOS X terminology. There are several different object file
formats supported under MacOS X. Aside from the Classic MacOS stuff, the
are object files (.o), dynamic libraries (.dylib), bundles (.so), and
executables. I thought I needed to create a dynamic library, but it turns
out that the right choice is a bundle.

Could whoever is in charge of documentation please add the contents of the
DocNote I added to http://www.postgresql.org/idocs/index.php?xfunc-c.html

The DocNote is on the page, but for those of you who don't want to bother
going to the web page:

Until MacOS X is covered in the main body, here is the commandline
needed to prepare an extension (this assumes that the developer tools
are installed):

cc -c foo.c
cc -bundle -flat_namespace -undefined suppress -o foo.so foo.o

} regards, tom lane
--Greg