Horton

Re: pl/perl extension fails on Windows

Ashutosh Sharma <ashu.coek88@gmail.com>

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From: Ashutosh Sharma <ashu.coek88@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>, Andrew Dunstan <andrew.dunstan@2ndquadrant.com>, Dave Page <dpage@pgadmin.org>, Sandeep Thakkar <sandeep.thakkar@enterprisedb.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2017-07-26T14:26:14Z
Lists: pgsql-hackers

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On Wed, Jul 26, 2017 at 8:51 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> Based on discussion downthread, it seems like what we actually need to
>> do is update perl.m4 to extract CCFLAGS.  Turns out somebody proposed
>> a patch for that back in 2002:
>> https://www.postgresql.org/message-id/Pine.LNX.4.44.0211051045070.16317-200000%40wotan.suse.de
>> It seems to need a rebase.  :-)
>
> Ah-hah, I *thought* we had considered the question once upon a time.
> There were some pretty substantial compatibility concerns raised in that
> thread, which is doubtless why it's still like that.
>
> My beef about inter-compiler compatibility (if building PG with a
> different compiler from that used for Perl) could probably be addressed by
> absorbing only -D switches from the Perl flags.  But Peter seemed to feel
> that even that could break things, and I worry that he's right for cases
> like -D_FILE_OFFSET_BITS which affect libc APIs.  Usually we'd have made
> the same decisions as Perl for that sort of thing, but if we didn't, it's
> a mess.
>
> I wonder whether we could adopt some rule like "absorb -D switches
> for macros whose names do not begin with an underscore".  That's
> surely a hack and three-quarters, but it seems safer than just
> absorbing everything willy-nilly.
>

Thanks Robert, Tom, Andrew and Amit for all your inputs. I have tried
to work on the patch shared by Reinhard  long time back for Linux. I
had to rebase the patch and also had to do add some more lines of code
to make it work on Linux. For Windows, I had to prepare a separate
patch to replicate similar behaviour.  I can see that both these
patches are working as expected i.e they are able import the switches
used by Perl into plperl module during build time.  However, on
windows i am still seeing the crash and i am still working to find the
reason for this.  Here, I attach the patches that i have prepared for
linux and Windows platforms. Thanks.

Commits

  1. MSVC: Test whether 32-bit Perl needs -D_USE_32BIT_TIME_T.

  2. Further tweaks to compiler flags for PL/Perl on Windows.

  3. Absorb -D_USE_32BIT_TIME_T switch from Perl, if relevant.

  4. PL/Perl portability fix: absorb relevant -D switches from Perl.

  5. PL/Perl portability fix: avoid including XSUB.h in plperl.c.