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From: mahendrakar s <mahendrakarforpg@gmail.com>
Date: Thu, 23 Feb 2023 19:08:50 +0530
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Subject: using libjansson in postgres extension
To: pgsql-novice <pgsql-novice@lists.postgresql.org>
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Hello Hackers,

I'm developing an extension where in it indirectly references (libjansson)
and libjansson has a symbol json_object
<https://github.com/akheron/jansson/blob/master/src/load.c#:~:text=json_t%20*object%20%3D%20json_object()%3B>which
conflicts with postgres  symbol 'json_object
<https://github.com/postgres/postgres/blob/master/src/backend/utils/adt/json.c#:~:text=json_object(PG_FUNCTION_ARGS)>
'.

I see below:
PostgreSQL: Documentation: 11: 38.10. C-Language Functions
<https://www.postgresql.org/docs/11/xfunc-c.html#id-1.8.3.13.8>
"Symbol names defined within object files must not conflict with each other
or with symbols defined in the PostgreSQL server executable. You will have
to rename your functions or variables if you get error messages to this
effect."

But this requires to maintain libjansson with customizations(have a
different symbol) to meet the needs.

Do you have any suggestions to use the libjansson 'as it is' without using
the different symbol.

Thanks,
Mahendrakar.

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<div dir=3D"ltr">Hello Hackers,<div><br></div><div>I&#39;m developing an ex=
tension where=C2=A0in it indirectly references (libjansson) and libjansson =
has a symbol <a href=3D"https://github.com/akheron/jansson/blob/master/src/=
load.c#:~:text=3Djson_t%20*object%20%3D%20json_object()%3B">json_object </a=
>which conflicts with postgres=C2=A0 symbol &#39;<a href=3D"https://github.=
com/postgres/postgres/blob/master/src/backend/utils/adt/json.c#:~:text=3Djs=
on_object(PG_FUNCTION_ARGS)">json_object</a>&#39;.</div><div><br></div><div=
>I see below:<br></div><div><a href=3D"https://www.postgresql.org/docs/11/x=
func-c.html#id-1.8.3.13.8">PostgreSQL: Documentation: 11: 38.10. C-Language=
 Functions</a><br>&quot;Symbol names defined within object files must not c=
onflict with each other or with symbols defined in the PostgreSQL server ex=
ecutable. You will have to rename your functions or variables if you get er=
ror messages to this effect.&quot;<br></div><div><br></div><div>But this re=
quires to maintain libjansson with customizations(have a different symbol) =
to meet the needs.<br></div><div><br></div><div>Do you have any suggestions=
 to use the libjansson &#39;as it is&#39; without using the different symbo=
l.</div><div><br></div><div>Thanks,</div><div>Mahendrakar.</div><div><br></=
div><div><br></div></div>

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