From: Zeugswetter Andreas <ZeugswetterA@spardat.at>
-$Date: 2005/11/04 18:16:50 $
+$Date: 2005/12/08 21:36:50 $
On AIX 4.3.2 PostgreSQL compiled with the native IBM compiler xlc
(vac.C 5.0.1) passes all regression tests. Other versions of OS and
http://www.han.de/~jum/aix/ldd.c
---
-From: Christopher Browne <cbbrowne@ca.afilias.info>
-Date: 2005-11-02
-
-On AIX 5.3 ML3 (e.g. maintenance level 5300-03), there is some problem
-with the handling of the pointer to memcpy. It is speculated that
-this relates to some linker bug that may have been introduced between
-5300-02 and 5300-03, but we have so far been unable to track down the
-cause.
-
-At any rate, the following patch, which "unwraps" the function
-reference, has been observed to allow PG 8.1 pre-releases to pass
-regression tests.
-
-The same behaviour (albeit with varying underlying functions to
-"blame") has been observed when compiling with either GCC 4.0 or IBM
-XLC.
-
------------- per Seneca Cunningham -------------------
-
-The following patch works on the AIX 5.3 ML3 box here and didn't cause
-any problems with postgres on the x86 desktop. It's just a cleaner
-version of what I tried earlier.
-
-*** dynahash.c.orig Tue Nov 1 19:41:42 2005
---- dynahash.c Tue Nov 1 20:30:33 2005
-***************
-*** 670,676 ****
-
-
- /* copy key into record */
- currBucket->hashvalue = hashvalue;
-! hashp->keycopy(ELEMENTKEY(currBucket), keyPtr, keysize);
-
-
- /* caller is expected to fill the data field on return */
-
-
---- 670,687 ----
-
-
- /* copy key into record */
- currBucket->hashvalue = hashvalue;
-! if (hashp->keycopy == memcpy)
-! {
-! memcpy(ELEMENTKEY(currBucket), keyPtr, keysize);
-! }
-! else if (hashp->keycopy == strncpy)
-! {
-! strncpy(ELEMENTKEY(currBucket), keyPtr, keysize);
-! }
-! else
-! {
-! hashp->keycopy(ELEMENTKEY(currBucket), keyPtr, keysize);
-! }
-
-
- /* caller is expected to fill the data field on return */
------------- per Seneca Cunningham -------------------
+AIX, readline, and postgres 8.1.x:
+----------------------------------
+
+If make check doesn't work on AIX with initdb going into an infinite
+loop or failing with child processes terminated with signal 11, the
+problem could be the installed copy of readline. Previously a patch to
+dynahash.c was suggested to get around this, don't use it, better ways
+to get postgres working exist.
+
+See <http://archives.postgresql.org/pgsql-patches/2005-11/msg00139.php>
+for details about the problem.
+
+Working around the problem:
+---------------------------
+1) Use the new 8.2devel backend Makefile:
+After the matter of readline's export list and the problems that were
+occurring on AIX because of it being linked to the backend, a filter
+to exclude unneeded libraries from being linked against the backend was
+added. Get revision 1.112 of src/backend/Makefile from CVS and replace
+the copy that came with postgres with it. Build normally.
+
+2) Use libedit:
+There are a few libedit ports available online. Build and install the
+desired port. If libreadline.a can be found in /lib, /usr/lib, or in
+any location passed to postgres' configure via "--with-libraries=",
+readline will be detected and used by postgres. IBM's rpm of readline
+creates a symlink to /opt/freeware/lib/libreadline.a in /lib, so merely
+excluding /opt/freeware/lib from the passed library path does not stop
+readline from being used.
+
+If the linker cannot avoid finding libreadline.a, use revision 1.433
+configure.in and 1.19 config/programs.m4 from CVS, change 8.2devel to
+the appropriate 8.1.x in configure.in and run autoconf. Add the
+configure flag "--with-libedit-preferred".
+
+If the version of libedit used calls its "history.h" something other
+than history.h, place a symlink called history.h to it somewhere that
+the C preprocessor will check.
+
+3) Configure with "--without-readline":
+postgres can be configured with the option "--without-readline". When
+this is enabled, postgres will not link against libreadline or libedit.
+psql will not have history, tab completion, or any of the other niceties
+that readline and libedit bring, but external readline wrappers exist
+that add that functionality.
+
+4) Use readline 5.0:
+Readline 5.0 does not induce the problems, however it does export
+memcpy and strncpy when built using the easy method of "-bexpall". Like
+4.3, it is possible to do a build that does not export these symbols,
+but it does take considerable manual effort and the creation of export
+files.
+
+References
+----------
+"AIX 5L Porting Guide"
+ IBM Redbook
+ http://www.redbooks.ibm.com/redbooks/pdfs/sg246034.pdf
+ http://www.redbooks.ibm.com/abstracts/sg246034.html?Open
+
+"Developing and Porting C and C++ Applications on AIX"
+ IBM Redbook
+ http://www.redbooks.ibm.com/redbooks/pdfs/sg245674.pdf
+ http://www.redbooks.ibm.com/abstracts/sg245674.html?Open
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