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From: Tom Lane <tgl@sss.pgh.pa.us>
To: ross@burtonini.com
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #19727: pg-combinebackup fails to link
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Comments: In-reply-to PG Bug reporting form <noreply@postgresql.org>
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Date: Tue, 29 Sep 2026 10:48:20 -0400
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PG Bug reporting form <noreply@postgresql.org> writes:
> When I build pg-combineback from postgress 18.6 (in Yocto, cross-compiled on
> aarch64 to aarch64), it fails to link:

> aarch64-poky-linux-ld: src/common/libpgcommon.a(jsonapi.o): in function
> `json_lex_number':
> src/common/jsonapi.c:2379:(.text+0x168): undefined reference to
> `appendBinaryPQExpBuffer'

You seem to be using a broken linker :-(

pg_combinebackup doesn't use any of the functions in
src/common/jsonapi.c.  Therefore, the jsonapi.o member of
libpgcommon.a shouldn't get pulled into the link, and its
unsatisfied dependency on libpq.so shouldn't matter.
Apparently, whatever build toolchain you're using has
forgotten this decades-old principle of .a library usage.

			regards, tom lane