link errors building extensions for Postgres on Windows using MinGW

[Eric Davies <Eric@xxxxxxxxxxxxx>]

I'm trying to port an extension that previously ran under Postgres on
linux so that it runs under PostgreSQL 8.0.3 on Windows. I'm using MingGW
for the compiling/linking.

I'm getting problems when I try to link though. Symbols that are defined
in the Postgres server and referenced in my extension cause link errors
that prevent a dll from being produced.

fe-giefToGrid.c:25: undefined reference to `pg_detoast_datum'

fe-udr.c:510: undefined reference to `Float8GetDatum'

libgridfrontendDEBUG.a(fe-udr.o)(.text+0xbe7):fe-udr.c:515: undefined reference to `get_typlenbyvalalign'

 I can get rid of these link errors by linking in the
libpostgres.a file at the cost of a much larger shared library. In
theory, I shouldn't need to though (at least I don't under linux), and
doing so may result in two inconsistent copies of some Postgres internal
data structures presumably. My link line looks like:

gcc -u_etext -shared -fpic  -Wl,--whole-archive -o destDir/Grid.dll
-Lmylibdir -L/lib -L/c/Program\ Files/PostgreSQL/8.0/lib -lmylibs
-Wl,--no-whole-archive  -lpostgres -lwsock32 -lm 2>
link.errs

can anyone suggest a solution?

Thank you,

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Eric Davies, M.Sc.
Barrodale Computing Services Ltd.
Tel: (250) 472-4372 Fax: (250) 472-4373
Web: http://www.barrodale.com
Email: eric@xxxxxxxxxxxxx
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