writing & flushing C extensions

I'm trying to write a few functions in C for postgres. But, when I change
some code, I'm never sure that it'll be flushed when I do a;

DROP FUNCTION test();
CREATE FUNCTION test() RETURNS text AS '/var/lib/pgsql/functions/test.so' LANGUAGE 'c';

Is there a way to make sure ? Even restarting postgres doesn't always
work (or else my makefiles are broken...)

Kate

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