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Trying to use, from PHP (manual build of 5.5) + PDO_odbc driver raises this error.

Studying a little the unixODBC spec.

Upstream use soname .1 which is raised to .2 by the so-version-bump.patch
-LIB_VERSION="1:0:0"
+LIB_VERSION="2:0:0"

Problem : this is harcoded in DriverManager/SQLConnect.c
#define CURSOR_LIB      "libodbccr"
#define CURSOR_LIB_VER  ".1"
...

        sprintf( name, "%s%s%s", CURSOR_LIB, ext, CURSOR_LIB_VER );
        if ( !(connection -> cl_handle = odbc_dlopen( name )))
...

The trivial Fix seems missing.
  sed -e '/CURSOR_LIB_VER/s/1/2/' -i DriverManager/SQLConnect.c

Created attachment 859089 [details]
New so-version-bump.patch

I re-created the so-version-bump.patch, adding the macro increment into it.

Created attachment 859134 [details]
New so-version-bump.patch

I redid the patch in less intrusive way, this version only adds the macro increment and do not fiddle with other files.

Pushed the updated patch to dist-git.

Commit: http://pkgs.devel.redhat.com/cgit/rpms/unixODBC/commit/?h=rhel-6.6&id=88d9503b034927975a8f166fd8a483d7615da4e3

SanityOnly - I'm unable to reproduce the original problem, php pdo works for me with the old version, however, I can confirm the change in the code

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-0869.html