postgresql extension API proof of concept

Dear hackers,

after some comments and discussions, here is a proof-of-concept
demonstration of a postgresql extension infrastructure.

(1) apply the patch...

(2) ********** REGENERATE CONFIGURE ************
 sh> autoconf configure.in > configure sh> chmod +x configure

(3) configure, compile, install and use postgresql:
 sh> configure --prefix=/tmp/pg sh> make sh> make install
  where is our postgresql installation... sh> PATH=/tmp/pg/bin:$PATH


(5) build an extension with the new infrastructure, for instance   with some contrib that define a new type.
 sh> cd contrib/isbn_issn sh> mv Makefile Makefile.old
   now create an appropriate extension Makefile (well, this should   have been done by the person who provides the
extension)
 sh> cat > Makefile
PGXSDIR := $(shell pg_config --pgxsdir)
include $(PGXSDIR)/pgxs_begin.mk
MODULES = isbn_issn
DATA_built = isbn_issn.sql
DOCS = README.isbn_issn
include $(PGXSDIR)/pgxs_end.mk

(6) now enjoy:  sh> make  sh> make install  sh> make clean  sh> make uninstall


There is a sample extension makefile in $(pg_config --pgxsdir)/Makefile.pgxs
No real documentation yet, maybe hidden bugs...

Thanks in advance for your comments.

-- 
Fabien Coelho - coelho@cri.ensmp.fr