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In-Reply-To: <aSTRj99MkyI5zr0y@paquier.xyz>
From: VASUKI M <vasukim1992002@gmail.com>
Date: Tue, 25 Nov 2025 14:41:32 +0530
Message-ID: <CACTYHzhCNsee-4xv-HDhw8zmMWByB7YHLuUHh-bsztgZ94ewpw@mail.gmail.com>
Subject: Re: BUG #19095: Test if function exit() is used fail when linked static
To: Michael Paquier <michael@paquier.xyz>
Cc: Daniel Gustafsson <daniel@yesql.se>, Tom Lane <tgl@sss.pgh.pa.us>, BharatDB <bharatdbpg@gmail.com>, 
	torsten.rupp@gmx.net, pgsql-bugs@lists.postgresql.org, byavuz81@gmail.com
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On Tue, 25 Nov 2025 at 03:14, Michael Paquier <michael@paquier.xyz> wrote:

> Including a reference to "nm" in this comment for meson is definitely
> fine, because it is used as a pre-check in this code with
> find_program.  However, shouldn't we document the platform-specific
> exclusions in the perl script itself?  As of the patch, the
> explanation is a copy-paste of src/interfaces/libpq/Makefile.  I think
> that we'd better group everything together, rather than have the same
> contents explained in two places.  Perhaps I would add an extra
> comment in meson.build and the Makefile to document that all the
> platform-relevant details are in the perl script itself.
>
> Thanks for this suggestion michael & Nazir for the code,i have made the
changes you said

Also added the check where it scans for nm in the environment if it is not
present then it gracefully skips the test.
V3 attached kindly check and review it.


> I would be also tempted to move the solaris check inside the perl
> script rather than have it duplicated across meson and make, then do
> something based on $Config{osname} instead.
>
Done

Testing performed:
  - Built with both autoconf+Makefile and Meson builds.
  - Verified the script runs inside Meson via the custom_target and
    confirmed with ninja -v.
>grep -R "libpq-exit-check" build.ninja
build src/interfaces/libpq/libpq-refs-stamp: CUSTOM_COMMAND
src/interfaces/libpq/libpq.so.5.19 |
../src/interfaces/libpq/libpq-exit-check /usr/bin/perl
 COMMAND =3D /usr/bin/perl ../src/interfaces/libpq/libpq-exit-check
--input_file src/interfaces/libpq/libpq.so.5.19 --stamp_file
src/interfaces/libpq/libpq-refs-stamp
 description =3D Generating$ src/interfaces/libpq/libpq-exit-check$ with$ a=
$
custom$ command

  - Injected a fake exit() reference into fe-connect.c and ensured the
    build fails with the expected error message.
  - Confirmed that removing nm causes the script to skip the check cleanly.
  - Verified that Meson=E2=80=99s stamp file prevents re-running the check =
when
    libpq.so has not changed.

Regards,
Vasuki M
CDAC-Chennai

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<div dir=3D"ltr"><div dir=3D"ltr">On Tue, 25 Nov 2025 at 03:14, Michael Paq=
uier &lt;<a href=3D"mailto:michael@paquier.xyz">michael@paquier.xyz</a>&gt;=
 wrote:</div><div class=3D"gmail_quote gmail_quote_container"><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">
Including a reference to &quot;nm&quot; in this comment for meson is defini=
tely<br>
fine, because it is used as a pre-check in this code with<br>
find_program.=C2=A0 However, shouldn&#39;t we document the platform-specifi=
c<br>
exclusions in the perl script itself?=C2=A0 As of the patch, the<br>
explanation is a copy-paste of src/interfaces/libpq/Makefile.=C2=A0 I think=
<br>
that we&#39;d better group everything together, rather than have the same<b=
r>
contents explained in two places.=C2=A0 Perhaps I would add an extra<br>
comment in meson.build and the Makefile to document that all the<br>
platform-relevant details are in the perl script itself.<br>
<br></blockquote><div>Thanks for this suggestion michael &amp; Nazir for th=
e code,i have made the changes you said=C2=A0<br><br>Also added the check w=
here it scans for nm in the environment if it is not present then it gracef=
ully skips the test.<br>V3 attached kindly check and review it.</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I would be also tempted to move the solaris check inside the perl<br>
script rather than have it duplicated across meson and make, then do<br>
something based on $Config{osname} instead.<br></blockquote><div>Done</div>=
<div><br>Testing performed:<br>=C2=A0 - Built with both autoconf+Makefile a=
nd Meson builds.<br>=C2=A0 - Verified the script runs inside Meson via the =
custom_target and<br>=C2=A0 =C2=A0 confirmed with ninja -v.<br>&gt;grep -R =
&quot;libpq-exit-check&quot; build.ninja<br>build src/interfaces/libpq/libp=
q-refs-stamp: CUSTOM_COMMAND src/interfaces/libpq/libpq.so.5.19 | ../src/in=
terfaces/libpq/libpq-exit-check /usr/bin/perl<br>=C2=A0COMMAND =3D /usr/bin=
/perl ../src/interfaces/libpq/libpq-exit-check --input_file src/interfaces/=
libpq/libpq.so.5.19 --stamp_file src/interfaces/libpq/libpq-refs-stamp<br>=
=C2=A0description =3D Generating$ src/interfaces/libpq/libpq-exit-check$ wi=
th$ a$ custom$ command</div><div><br>=C2=A0 - Injected a fake exit() refere=
nce into fe-connect.c and ensured the<br>=C2=A0 =C2=A0 build fails with the=
 expected error message.<br>=C2=A0 - Confirmed that removing nm causes the =
script to skip the check cleanly.<br>=C2=A0 - Verified that Meson=E2=80=99s=
 stamp file prevents re-running the check when<br>=C2=A0 =C2=A0 libpq.so ha=
s not changed.<br><br>Regards,<br>Vasuki M</div><div>CDAC-Chennai</div></di=
v></div>

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