AIX FAQ Updates

I believe this change will apply equally to 7.4, 8.0, and CVS HEAD.

Index: FAQ_AIX
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/FAQ_AIX,v
retrieving revision 1.11
diff -c -u -r1.11 FAQ_AIX
--- FAQ_AIX 12 Nov 2002 20:02:32 -0000 1.11
+++ FAQ_AIX 15 Jul 2005 15:51:10 -0000
@@ -18,3 +18,79 @@
You need libm.a that is in the fileset bos.adt.libm. (Try the
following command.)
$ lslpp -l bos.adt.libm
+
+
+---
+From: Christopher Browne <cbbrowne(at)ca(dot)afilias(dot)info>
+Date: 2005-07-15
+
+On AIX 5.3, there have been some problems getting PostgreSQL to
+compile and run using GCC.
+
+1. You will want to use a version of GCC subsequent to 3.3.2,
+ particularly if you use a prepackaged version. We had good
+ success with 4.0.1.
+
+ Problems with earlier versions seem to have more to do with the
+ way IBM packaged GCC than with actual issues with GCC, so that if
+ you compile GCC yourself, you might well have success with an
+ earlier version of GCC.
+
+2. AIX 5.3 has a problem where sockadr_storage is not defined to be
+ large enough. In version 5.3, IBM increased the size of
+ sockaddr_un, the address structure for UNIX Domain Sockets, but
+ did not correspondingly increase the size of sockadr_storage.
+
+ The result of this is that attempts to use UDS with PostgreSQL
+ lead to libpq overflowing the data structure. TCP/IP connections
+ work OK, but not UDS, which prevents the regression tests from
+ working.
+
+ The nonconformance may be readily demonstrated by compiling and
+ running the following C program which calculates and compares the
+ sizes of the various structures:
+
+test_size.c
+------------
+
+---------- snip here - test_size.c ----------------------------
+#include <stdio.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+int main (int argc, char *argv[]) {
+ struct sockaddr_storage a;
+ struct sockaddr_un b;
+ printf("Size of sockadr_storage: %d\n", sizeof(a));
+ printf ("Size of sockaddr_un:%d\n", sizeof(b));
+
+ if (sizeof(a) >= sizeof(b))
+ printf ("Conformant to RFC 3493\n");
+ else
+ printf ("Non-conformant to RFC 3493\n");
+}
+---------- snip here - test_size.c ----------------------------
+
+
+The problem was reported to IBM, and is recorded as bug report
+PMR29657.
+
+An immediate resolution is to alter _SS_MAXSIZE to = 1025 in
+/usr/include/sys/socket.h, which will resolve the immediate problem.
+
+It appears that the "final" resolution will be to alter _SS_MAXSIZE to
+1280, making the size nicely align with page boundaries.
+
+IBM will be providing a fix in the next maintenance release (expected
+in October 2005) with an updated socket.h.
+---
+From: Christopher Browne <cbbrowne(at)ca(dot)afilias(dot)info>
+Date: 2005-07-15
+
+Some of the AIX tools may be "a little different" from what you may be
+accustomed to on other platforms. If you are looking for a version of
+ldd, useful for determining what object code depends on what
+libraries, the following URLs may help you...
+
+http://www.faqs.org/faqs/aix-faq/part4/section-22.html
+
+http://www.han.de/~jum/aix/ldd.c
\ No newline at end of file

--
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