Remove AIX support

There isn't a lot of user demand for AIX support, we have a bunch of
hacks to work around AIX-specific compiler bugs and idiosyncrasies,
and no one has stepped up to the plate to properly maintain it.
Remove support for AIX to get rid of that maintenance overhead. It's
still supported for stable versions.

The acute issue that triggered this decision was that after commit
8af2565248, the AIX buildfarm members have been hitting this
assertion:

    TRAP: failed Assert("(uintptr_t) buffer == TYPEALIGN(PG_IO_ALIGN_SIZE, buffer)"), File: "md.c", Line: 472, PID: 2949728

Apperently the "pg_attribute_aligned(a)" attribute doesn't work on AIX
for values larger than PG_IO_ALIGN_SIZE, for a static const variable.
That could be worked around, but we decided to just drop the AIX support
instead.

Discussion: https://www.postgresql.org/message-id/[email protected]
Reviewed-by: Andres Freund, Noah Misch, Thomas Munro

1 files changed, 0 insertions, 15 deletions

diff --git a/src/backend/meson.build b/src/backend/meson.build
index 8767aaba678..436c04af080 100644
--- a/src/backend/meson.build
+++ b/src/backend/meson.build
@@ -91,21 +91,6 @@ if cc.get_id() == 'msvc'
   # be restricted to b_pch=true.
   backend_link_with += postgres_lib
 
-elif host_system == 'aix'
-  # The '.' argument leads mkldexport.sh to emit "#! .", which refers to the
-  # main executable, allowing extension libraries to resolve their undefined
-  # symbols to symbols in the postgres binary.
-  postgres_imp = custom_target('postgres.imp',
-    command: [files('port/aix/mkldexport.sh'), '@INPUT@', '.'],
-    input: postgres_lib,
-    output: 'postgres.imp',
-    capture: true,
-    install: true,
-    install_dir: dir_lib,
-    build_by_default: false,
-  )
-  backend_link_args += '-Wl,-bE:@0@'.format(postgres_imp.full_path())
-  backend_link_depends += postgres_imp
 endif
 
 backend_input = []