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From: Torsten Rupp <[email protected]>
To: [email protected]
Subject: Re: BUG #19095: Test if function exit() is used fail when linked static
Date: Sun, 9 Nov 2025 09:33:16 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Dear developers,

I opened this request for a behavior concerning functions with the name 
part "exit":

 > Bug reference:      19095
> Logged by:          Torsten Rupp
> Email address:      [email protected]
> PostgreSQL version: 15.14
> Operating system:   Linux
> Description:
> 
> Note: occur from version 15.14 or newer.
> 
> In src/interfaces/libpq/Makefile is a test if the function "exit()" (or in
> general: a function exists with the name part "exit") is used:
> 
> libpq-refs-stamp: $(shlib)
> ifneq ($(enable_coverage), yes)
> ifeq (,$(filter aix solaris,$(PORTNAME)))
>          @if nm -A -u $< 2>/dev/null | grep -v __cxa_atexit | grep exit; then
> \
>                  echo 'libpq must not be calling any function which invokes
> exit'; exit 1; \
>          fi
> endif
> endif
> 
> This test fail if libpq is linked static to an application when e. g.
> libcrypto is also linked static into libpq which add indirectly a call to
> "pthread_exit()".
> 
> Possible fix: exclude pthread_exit(), too (like __cxa_atexit), e.g.:
> 
> libpq-refs-stamp: $(shlib)
> ifneq ($(enable_coverage), yes)
> ifeq (,$(filter aix solaris,$(PORTNAME)))
>          @if nm -A -u $< 2>/dev/null | grep -v __cxa_atexit | grep -v
> pthread_exit | grep exit; then \
>                  echo 'libpq must not be calling any function which invokes
> exit'; exit 1; \
>          fi
> endif
> endif

BTW: if you wonder about static linkage: I'm aware of the disadvantages, 
but I use static linkage for a backup tool which should run e. g. in any 
live Linux from a USB medium, thus it should have as less dependencies 
to shared libraries as possible. A non-static version of the tool is 
also available. The issue does not occur with shared libraries, because 
then no function with the name part "exit" is linked into libpq.

Thank you for your attention.

Best regards, Torsten Rupp

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