README.AIX

Building on AIX
===============

Install
=======

AIX seems to ship with a install tool /usr/bin/bsdinstall, unfortunatly
the version of autoconf that unixODBC uses doesn't seem to like this, so
make sure it doesn't find this. It may be best to define INSTALL as a 
empty string before building, forcing it to use the builtin install-sh.

Threads
=======

You need to decide to build with or without threads, if you want threads
I would do this

export CC=xlc_r
export CXX=xlC_r
./configure 

If you don't want threads, do this

export CC=xlc
export CXX=xlC
./configure --enable-threads=no

Shared Libs
===========

Because of the way that AIX builds its shared libs there are a couple of 
points to remember

1. All drivers need changing into .so

The drivers will be build as a .a, containing a .so, BUT dlopen only is 
able to open a .so, so to fix this, for each driver that is needed, do
the following (in this case the postgres driver).

Go to the target lib directory

	cd /usr/local/lib

extract the .so from the .a

	ar -x libodbcpsql.a

This will create libodbcpsql.so.2

The same will need doing for the seyup libs

	ar -x libodbcpsqlS.a

2. Shared libs containing C++ are special

This is only a issue with the libodbcinstQ.a lib that is opened by
ODBCConfig. There are two things, first because libtool decides that 
shared libs ar lib*.a the code trys to load libodbcinstQ.a, and also
we maye have to rebuild the lib using the IBM util makeC++SharedLib 
(the name gives its away :-)

I have tried this with a current AIX, and it seems that all is needed is to extract the .so 
from the .a by running ar -x libodbcinstQ.a to get the .so

If that doesn't help, or on older AIX's the following may need doing.

After the make install is done, go into the odbcinstQ dir on thE
build tree, and do the following

	makeC++SharedLib -p 0 -o libodbcinstQ.so.1.0 -L$QTDIR/lib -lqt -L$PREFIX/lib -lodbc -lodbcinst  .libs/libodbcinstQ.lax/libodbcextraslc.al/strcasecmp.o  *.o ../ini/*.lo

where QTDIR is set to the top of the qt tree, so $QTDIR/lib will contain libqt.a 
and PREFIX is set to the unixODBC install tree, so $PREFIX/lib contains libodbc.a.
Ignore any duplicate symbol warnings they are due to the same things being in libodbc.a
and libodbcinst.a

this will then build a libodbcinstQ.so.1.0, we can copy that to the target lib dir,
and delete the existing lib, and link it (again replace $PREFIX with the correct path

	cp libodbcinstQ.so.1.0 $PREFIX/lib
	cd $PREFIX/lib
	rm libodbcinstQ.a
	ln -s libodbcinstQ.so.1.0 libodbcinstQ.a

Then all should be OK with ODBCConfig

Nick Gorham