Committed, after fixing the various little things you pointed out:

On 28/02/2024 00:30, Thomas Munro wrote:
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -3401,7 +3401,7 @@ export MANPATH
    <para>
     <productname>PostgreSQL</productname> can be expected to work on current
     versions of these operating systems: Linux, Windows,
-   FreeBSD, OpenBSD, NetBSD, DragonFlyBSD, macOS, AIX, Solaris, and illumos.
+   FreeBSD, OpenBSD, NetBSD, DragonFlyBSD, macOS, Solaris, and illumos.

There is also a little roll-of-honour of operating systems we used to
support, just a couple of paragraphs down, where AIX should appear.

Added.

On 28/02/2024 05:52, Noah Misch wrote:
Regardless of how someone were to step up to maintain it, we'd be telling them
such contributions have negative value and must stop.  We're expelling AIX due
to low demand, compiler bugs, its ABI, and its shlib symbol export needs.

Reworded.

Apperently the "pg_attribute_aligned(a)" attribute doesn't work on AIX
(linker?) for values larger than PG_IO_ALIGN_SIZE.

No; see https://postgr.es/m/20240225194322.a5%40rfd.leadboat.com

Ok, reworded.

On 28/02/2024 11:26, Andres Freund wrote:
On 2024-02-28 00:24:01 +0400, Heikki Linnakangas wrote:
The problem is due to this hunk:
@@ -401,10 +376,6 @@ install-lib-static: $(stlib) installdirs-lib
install-lib-shared: $(shlib) installdirs-lib
  ifdef soname
-# we don't install $(shlib) on AIX
-# (see 
http://archives.postgresql.org/message-id/52ef20b2e3209443bc37736d00c3c1380a6e7...@exadv1.host.magwien.gv.at)
-ifneq ($(PORTNAME), aix)
-       $(INSTALL_SHLIB) $< '$(DESTDIR)$(libdir)/$(shlib)'
  ifneq ($(PORTNAME), cygwin)
  ifneq ($(PORTNAME), win32)
  ifneq ($(shlib), $(shlib_major))

So the versioned name didn't end up getting installed anymore, leading to
broken symlinks in the install directory.

Fixed, thanks!

diff --git a/src/bin/pg_basebackup/t/010_pg_basebackup.pl 
b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
index 86cc01a640b..fc6b00224f6 100644
--- a/src/bin/pg_basebackup/t/010_pg_basebackup.pl
+++ b/src/bin/pg_basebackup/t/010_pg_basebackup.pl
@@ -400,9 +400,6 @@ is(scalar(@tblspc_tars), 1, 'one tablespace tar was 
created');
  SKIP:
  {
        my $tar = $ENV{TAR};
-       # don't check for a working tar here, to accommodate various odd
-       # cases such as AIX. If tar doesn't work the init_from_backup below
-       # will fail.
        skip "no tar program available", 1
          if (!defined $tar || $tar eq '');

Maybe better to not remove the whole comment, just the reference to AIX?

Ok, done

diff --git a/src/test/regress/sql/sanity_check.sql 
b/src/test/regress/sql/sanity_check.sql
index 7f338d191c6..2e9d5ebef3f 100644
--- a/src/test/regress/sql/sanity_check.sql
+++ b/src/test/regress/sql/sanity_check.sql
@@ -21,12 +21,15 @@ SELECT relname, relkind
         AND relfilenode <> 0;
--
--- When ALIGNOF_DOUBLE==4 (e.g. AIX), the C ABI may impose 8-byte alignment on
+-- When MAXIMUM_ALIGNOF==8 but ALIGNOF_DOUBLE==4, the C ABI may impose 8-byte 
alignment
  -- some of the C types that correspond to TYPALIGN_DOUBLE SQL types.  To 
ensure
  -- catalog C struct layout matches catalog tuple layout, arrange for the tuple
  -- offset of each fixed-width, attalign='d' catalog column to be divisible by 
8
  -- unconditionally.  Keep such columns before the first NameData column of the
  -- catalog, since packagers can override NAMEDATALEN to an odd number.
+-- (XXX: I'm not sure if any of the supported platforms have 
MAXIMUM_ALIGNOF==8 and
+-- ALIGNOF_DOUBLE==4.  Perhaps we should just require that
+-- ALIGNOF_DOUBLE==MAXIMUM_ALIGNOF)
  --
  WITH check_columns AS (
   SELECT relname, attname,

I agree, this should be an error, and we should then remove the test.

Done.

--
Heikki Linnakangas
Neon (https://neon.tech)


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