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FAQ_AIX in 8.1.0 contains outdated information about how to deal with 

postgres problems due to readline.  The attached patch replaces that
section of it with better ways of handling the problem.

Seneca Cunningham
This commit is contained in:
Bruce Momjian 2005-12-08 21:36:50 +00:00
parent 04db9d25d1
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1 changed files with 56 additions and 50 deletions
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@ -1,5 +1,5 @@
From: Zeugswetter Andreas <ZeugswetterA@spardat.at> 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 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 (vac.C 5.0.1) passes all regression tests. Other versions of OS and
@ -114,62 +114,68 @@ http://www.faqs.org/faqs/aix-faq/part4/section-22.html
http://www.han.de/~jum/aix/ldd.c 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 AIX, readline, and postgres 8.1.x:
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 If make check doesn't work on AIX with initdb going into an infinite
reference, has been observed to allow PG 8.1 pre-releases to pass loop or failing with child processes terminated with signal 11, the
regression tests. 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.
The same behaviour (albeit with varying underlying functions to See <http://archives.postgresql.org/pgsql-patches/2005-11/msg00139.php>
"blame") has been observed when compiling with either GCC 4.0 or IBM for details about the problem.
XLC.
------------ per Seneca Cunningham ------------------- 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.
The following patch works on the AIX 5.3 ML3 box here and didn't cause 2) Use libedit:
any problems with postgres on the x86 desktop. It's just a cleaner There are a few libedit ports available online. Build and install the
version of what I tried earlier. 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.
*** dynahash.c.orig Tue Nov 1 19:41:42 2005 If the linker cannot avoid finding libreadline.a, use revision 1.433
--- dynahash.c Tue Nov 1 20:30:33 2005 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
*** 670,676 **** 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.
/* copy key into record */ 3) Configure with "--without-readline":
currBucket->hashvalue = hashvalue; postgres can be configured with the option "--without-readline". When
! hashp->keycopy(ELEMENTKEY(currBucket), keyPtr, keysize); 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.
/* caller is expected to fill the data field on return */ References
----------
"AIX 5L Porting Guide"
--- 670,687 ---- IBM Redbook
http://www.redbooks.ibm.com/redbooks/pdfs/sg246034.pdf
http://www.redbooks.ibm.com/abstracts/sg246034.html?Open
/* copy key into record */
currBucket->hashvalue = hashvalue; "Developing and Porting C and C++ Applications on AIX"
! if (hashp->keycopy == memcpy) IBM Redbook
! { http://www.redbooks.ibm.com/redbooks/pdfs/sg245674.pdf
! memcpy(ELEMENTKEY(currBucket), keyPtr, keysize); http://www.redbooks.ibm.com/abstracts/sg245674.html?Open
! }
! 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 -------------------