cd5fa5a5a1
postgres problems due to readline. The attached patch replaces that section of it with better ways of handling the problem. Seneca Cunningham
182 lines
6.7 KiB
Plaintext
182 lines
6.7 KiB
Plaintext
From: Zeugswetter Andreas <ZeugswetterA@spardat.at>
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$Date: 2005/12/08 21:36:50 $
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On AIX 4.3.2 PostgreSQL compiled with the native IBM compiler xlc
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(vac.C 5.0.1) passes all regression tests. Other versions of OS and
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compiler should also work. If you don't have a powerpc or use gcc you
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might see rounding differences in the geometry regression test.
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Use the following configure flags in addition to your own
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if you have readline or libz there:
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--with-includes=/usr/local/include --with-libraries=/usr/local/lib
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There will probably be warnings about 0.0/0.0 division and duplicate
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symbols which you can safely ignore.
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Compiling PostgreSQL with gcc (2.95.3) on AIX also works.
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You need libm.a that is in the fileset bos.adt.libm. (Try the
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following command.)
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$ lslpp -l bos.adt.libm
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---
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From: Christopher Browne <cbbrowne@ca.afilias.info>
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Date: 2005-07-15
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On AIX 5.3, there have been some problems getting PostgreSQL to
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compile and run using GCC.
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1. You will want to use a version of GCC subsequent to 3.3.2,
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particularly if you use a prepackaged version. We had good
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success with 4.0.1.
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Problems with earlier versions seem to have more to do with the
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way IBM packaged GCC than with actual issues with GCC, so that if
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you compile GCC yourself, you might well have success with an
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earlier version of GCC.
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2. AIX 5.3 has a problem where sockadr_storage is not defined to be
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large enough. In version 5.3, IBM increased the size of
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sockaddr_un, the address structure for UNIX Domain Sockets, but
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did not correspondingly increase the size of sockadr_storage.
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The result of this is that attempts to use UDS with PostgreSQL
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lead to libpq overflowing the data structure. TCP/IP connections
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work OK, but not UDS, which prevents the regression tests from
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working.
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The nonconformance may be readily demonstrated by compiling and
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running the following C program which calculates and compares the
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sizes of the various structures:
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test_size.c
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------------
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---------- snip here - test_size.c ----------------------------
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#include <stdio.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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int main (int argc, char *argv[]) {
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struct sockaddr_storage a;
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struct sockaddr_un b;
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printf("Size of sockadr_storage: %d\n", sizeof(a));
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printf ("Size of sockaddr_un:%d\n", sizeof(b));
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if (sizeof(a) >= sizeof(b))
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printf ("Conformant to RFC 3493\n");
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else
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printf ("Non-conformant to RFC 3493\n");
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}
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---------- snip here - test_size.c ----------------------------
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The problem was reported to IBM, and is recorded as bug report
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PMR29657.
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An immediate resolution is to alter _SS_MAXSIZE to = 1025 in
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/usr/include/sys/socket.h, which will resolve the immediate problem.
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It appears that the "final" resolution will be to alter _SS_MAXSIZE to
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1280, making the size nicely align with page boundaries.
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IBM will be providing a fix in the next maintenance release (expected
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in October 2005) with an updated socket.h.
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---
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PMR29657 was resolved in APAR IY74147: INCOMPATIBILITY BETWEEN
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SOCKADDR_UN AND SOCKADDR_STORAGE STRUCT
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APAR information
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APAR number IY74147
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Reported component name AIX 5.3
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Reported component ID 5765G0300
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Reported release 530
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Status CLOSED PER
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PE NoPE
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HIPER NoHIPER
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Submitted date 2005-07-18
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Closed date 2005-07-18
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Last modified date 2005-09-06
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If you upgrade to maintenance level 5300-03, that will include this
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fix. Use the command "oslevel -r" to determine what maintenance level
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you are at.
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---
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From: Christopher Browne <cbbrowne@ca.afilias.info>
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Date: 2005-07-15
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Some of the AIX tools may be "a little different" from what you may be
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accustomed to on other platforms. If you are looking for a version of
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ldd, useful for determining what object code depends on what
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libraries, the following URLs may help you...
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http://www.faqs.org/faqs/aix-faq/part4/section-22.html
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http://www.han.de/~jum/aix/ldd.c
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---
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AIX, readline, and postgres 8.1.x:
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----------------------------------
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If make check doesn't work on AIX with initdb going into an infinite
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loop or failing with child processes terminated with signal 11, the
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problem could be the installed copy of readline. Previously a patch to
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dynahash.c was suggested to get around this, don't use it, better ways
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to get postgres working exist.
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See <http://archives.postgresql.org/pgsql-patches/2005-11/msg00139.php>
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for details about the problem.
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Working around the problem:
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---------------------------
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1) Use the new 8.2devel backend Makefile:
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After the matter of readline's export list and the problems that were
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occurring on AIX because of it being linked to the backend, a filter
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to exclude unneeded libraries from being linked against the backend was
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added. Get revision 1.112 of src/backend/Makefile from CVS and replace
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the copy that came with postgres with it. Build normally.
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2) Use libedit:
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There are a few libedit ports available online. Build and install the
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desired port. If libreadline.a can be found in /lib, /usr/lib, or in
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any location passed to postgres' configure via "--with-libraries=",
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readline will be detected and used by postgres. IBM's rpm of readline
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creates a symlink to /opt/freeware/lib/libreadline.a in /lib, so merely
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excluding /opt/freeware/lib from the passed library path does not stop
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readline from being used.
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If the linker cannot avoid finding libreadline.a, use revision 1.433
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configure.in and 1.19 config/programs.m4 from CVS, change 8.2devel to
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the appropriate 8.1.x in configure.in and run autoconf. Add the
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configure flag "--with-libedit-preferred".
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If the version of libedit used calls its "history.h" something other
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than history.h, place a symlink called history.h to it somewhere that
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the C preprocessor will check.
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3) Configure with "--without-readline":
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postgres can be configured with the option "--without-readline". When
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this is enabled, postgres will not link against libreadline or libedit.
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psql will not have history, tab completion, or any of the other niceties
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that readline and libedit bring, but external readline wrappers exist
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that add that functionality.
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4) Use readline 5.0:
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Readline 5.0 does not induce the problems, however it does export
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memcpy and strncpy when built using the easy method of "-bexpall". Like
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4.3, it is possible to do a build that does not export these symbols,
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but it does take considerable manual effort and the creation of export
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files.
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References
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----------
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"AIX 5L Porting Guide"
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IBM Redbook
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http://www.redbooks.ibm.com/redbooks/pdfs/sg246034.pdf
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http://www.redbooks.ibm.com/abstracts/sg246034.html?Open
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"Developing and Porting C and C++ Applications on AIX"
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IBM Redbook
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http://www.redbooks.ibm.com/redbooks/pdfs/sg245674.pdf
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http://www.redbooks.ibm.com/abstracts/sg245674.html?Open
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