Re: Preventing abort() and exit() calls in libpq

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Cc: Jacob Champion <pchampion@vmware.com>, "daniel@yesql.se" <daniel@yesql.se>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, "michael@paquier.xyz" <michael@paquier.xyz>
Date: 2021-07-01T18:14:24Z
Lists: pgsql-hackers
Peter Eisentraut <peter.eisentraut@enterprisedb.com> writes:
> On 01.07.21 00:41, Jacob Champion wrote:
>> Spitballing -- if you don't like the stamp file, you could add the
>> check to the end of the $(shlib) rule, surrounded by an ifeq check.
>> Then .DELETE_ON_ERROR should take care of the rest, I think.

> Somewhere in the $(shlib) rule would seem most appropriate.  But I don't 
> understand the rest: What ifeq, and why .DELETE_ON_ERROR?

The variant of this I'd been thinking of was

 $(shlib): $(OBJS) | $(SHLIB_PREREQS)
 	$(LINK.shared) -o $@ $(OBJS) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK)
+ifneq (,$(SHLIB_EXTRA_ACTION))
+	$(SHLIB_EXTRA_ACTION)
+endif

(and similarly in several other places); then libpq's Makefile
could set SHLIB_EXTRA_ACTION to the desired thing.

The problem then is, what happens when the extra action fails?
Without .DELETE_ON_ERROR, the shlib is still there and the next
make run will think everything's good.

			regards, tom lane



Commits

  1. Further restrict the scope of no-exit()-in-libpq test.

  2. Improve build-time check that libpq doesn't call exit().

  3. Fix portability fallout from commit dc227eb82.

  4. Add a build-time check that libpq doesn't call exit() or abort().