Re: pgxs: build infrastructure for extensions v1

Have folks looked this over?  Is this the direction we want to go?

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Fabien COELHO wrote:
>
> Dear patchers,
>
>
> Please find attached a patch which provides a working infrastructure for
> pg extensions such as new gist-based indexes, functions, types...
>
> The infrastructure is a simple reworking of the already available internal
> infrastructure for contrib, so that it can be used outside of the
> postgresql source tree after installation, without gory details being in
> sight of the user...
>
> As a test case and show how, I provided new Makefile.pgxs for most contrib
> subdirectories. After postgresql has been configure, compiled and
> installed, simply try them with:
>
>     "cd contrib/foo ; make -f Makefile.pgxs install"
>
>
> BEWARE: The patch does not include an update of "configure", as I do not
> have the same version of "autoconf". So configure must be regenerated:
> "autoconf configure.in > configure"
>
> There is an initial documentation in "pgxs.sgml".
>
>
> How it works:
>
>  - necessary files (includes, scripts, makefiles...) are copied in lib/build
>    on the initial "make install". The adds 2MB of stuff. The former
>    installation can be obtained with "make light-install", but then
>    no extensions could be added to the installation, so this is more for
>    packagers that would like to provide a separate -dev package, IMHO.
>
>    Due to gnu-make restriction on how its includes work, these files must
>    be copied with the same directory structure as the pg source tree.
>    The fact does not appear at all in the actual infrastructure from the
>    user point of view, but it explains why subdirectories are necessary
>    under the build subdir...
>
>  - the makefile of any extension is expected to set macro PGXS to
>    "pg_config --pgxs", to include a special pgxs.mk makefile, and to
>    set some macros depending on what is to be built, just like in
>    current contrib. See the examples under contrib.
>
>  - I've added two PGXS-triggered conditionnals in Makefile.global,
>    so that includes and libraries are taken where needed...
>
>
> It works for me.
>
>
> Questions and thoughts:
>
>  - maybe more files should be copied? if so, which ones?
>
>  - should this actually replace the current "contrib" infrastructure?
>
>    I would tend to say "yes"...  that would require to replace all makefiles
>    there by the Makefile.pgxs version, to remove "contrib-global.mk", and
>    also possibly to update some documentations.
>
>  - more documentation?
>    integration of the documentation wrt pg doc?
>
>  - validation? one could thing of installing some contribs
>    when "make check" is performed, so as to validate that the
>    extension infrastructure is not broken?
>
>
> Have a nice day,
>
>
> --
> Fabien Coelho - coelho@cri.ensmp.fr

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