Re: pl/perl extension fails on Windows

Christoph Berg <myon(at)debian(dot)org> writes:
> HEAD as of 5a5c2feca still has the same problem on kfreebsd. Is there
> anything I could dump so we understand the problem better?

Yeah, I did not expect that 5a5c2feca would change anything on
non-Windows.

What we need to do is verify that PL/Perl's idea of
sizeof(PerlInterpreter) is different from Perl's own idea, and then
find out why --- ie, just which fields have different size/alignment
in the two compiles.

You mentioned upthread that configure shows this:

> checking for CFLAGS recommended by Perl... -D_REENTRANT -D_GNU_SOURCE
> -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include
> -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
> checking for CFLAGS to compile embedded Perl... -DDEBIAN

If the source of the problem is the same mechanism as it was for the
other platforms, then presumably the issue is that we need one or more
of
-D_REENTRANT
-D_GNU_SOURCE
-D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64
to be defined while building PL/Perl. Now, it couldn't be -D_GNU_SOURCE
that's at issue, because we turn that on in src/template/linux:

# Force _GNU_SOURCE on; plperl is broken with Perl 5.8.0 otherwise
CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"

(That ancient comment is pretty interesting in this connection, isn't it.)

And I'd have thought that _LARGEFILE_SOURCE=1 and _FILE_OFFSET_BITS=64
were the default behavior on any modern platform anyway, but maybe
kfreebsd is weird about that. Anyway, you could try sticking combinations
of these symbols into perl_embed_ccflags in src/Makefile.global and
rebuilding PL/Perl to see if the problem goes away; if that works it would
give us a leg up on where the problem is.

regards, tom lane