From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
cc: Michael Paquier <michael@paquier.xyz>,
        Jacob Champion <pchampion@vmware.com>,
        "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>,
        Daniel Gustafsson <daniel@yesql.se>
Subject: Re: Preventing abort() and exit() calls in libpq
In-reply-to: <622907.1625084114@sss.pgh.pa.us>
References: <3128896.1624742969@sss.pgh.pa.us>
 <18eda75d-af6d-3fc0-03b6-607eff9f392a@enterprisedb.com>
 <622907.1625084114@sss.pgh.pa.us>
Comments: In-reply-to Tom Lane <tgl@sss.pgh.pa.us>
	message dated "Wed, 30 Jun 2021 16:15:14 -0400"
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Date: Wed, 30 Jun 2021 18:29:11 -0400
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I wrote:
> Peter Eisentraut <peter.eisentraut@enterprisedb.com> writes:
>> Could we set this rule up a little bit differently so that it is only 
>> run when the library is built.
>> Right now, make world on a built tree makes 17 calls to this "nm" line, 
>> and make check-world calls it 81 times.  I think once would be enough. ;-)

> Hmm, didn't realize that would happen.  Will see what can be done.

Looks like we'd have to make use of a dummy stamp-file, more or less
as attached.  Any objections?

			regards, tom lane


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diff --git a/src/interfaces/libpq/.gitignore b/src/interfaces/libpq/.gitignore
index a4afe7c1c6..7478dc344a 100644
--- a/src/interfaces/libpq/.gitignore
+++ b/src/interfaces/libpq/.gitignore
@@ -1 +1,2 @@
 /exports.list
+/libpq-refs-stamp
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c2a35a488a..bb6ceec2c9 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -96,7 +96,7 @@ SHLIB_EXPORTS = exports.txt
 
 PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto
 
-all: all-lib check-libpq-refs
+all: all-lib libpq-refs-stamp
 
 # Shared library stuff
 include $(top_srcdir)/src/Makefile.shlib
@@ -108,9 +108,9 @@ backend_src = $(top_srcdir)/src/backend
 # If nm doesn't exist or doesn't work on shlibs, this test will do nothing,
 # which is fine.  The exclusion of __cxa_atexit is necessary on OpenBSD,
 # which seems to insert references to that even in pure C code.
-.PHONY: check-libpq-refs
-check-libpq-refs: $(shlib)
+libpq-refs-stamp: $(shlib)
 	! nm -A -g -u $< 2>/dev/null | grep -v __cxa_atexit | grep exit
+	touch $@
 
 # Make dependencies on pg_config_paths.h visible in all builds.
 fe-connect.o: fe-connect.c $(top_builddir)/src/port/pg_config_paths.h
@@ -141,7 +141,7 @@ uninstall: uninstall-lib
 
 clean distclean: clean-lib
 	$(MAKE) -C test $@
-	rm -f $(OBJS) pthread.h
+	rm -f $(OBJS) pthread.h libpq-refs-stamp
 # Might be left over from a Win32 client-only build
 	rm -f pg_config_paths.h
 

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