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Description of problem:
When attempting to build PHP with PDO (PHP Data Objects) module the resulting binary cannot execute when loading pdo module in php.ini.
Updating Glibc to 2.14.90-14 from Fedora 16 testing fixes the issue and allows PHP to execute.

Version-Release number of selected component (if applicable):
Glibc 2.12

How reproducible:
Build PHP with --enable-pdo and the resulting binary will not execute.

Steps to Reproduce:
1. Download PHP 5.3.8 from php.net, untar and enter directory.
2. Configure installation with --enable-pdo.
3. Build and install (make && make install)
4. Execute php and ask for version.
  
Actual results:
root@46-20-236-35 [~]# php -v
Illegal instruction
root@46-20-236-35 [~]# 


Expected results:
root@46-20-236-35 [~]# php -v
PHP 5.3.8 (cli) (built: Nov 4 2011 10:47:26) 
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
root@46-20-236-35 [~]# 

Additional info:
root@46-20-236-35 [~]# cat /usr/lib/php.ini | grep pdo
extension=pdo.so
extension=pdo_sqlite.so
extension=pdo_mysql.so
root@46-20-236-35 [~]#

Where does it crash?

The compilation doesn't crash per-sé it finishes with make status 0 and then the resulting binary of PHP is fine until loading PDO modules in php.ini.

The same build works fine on RHEL 5.5/5.6 with or without PDO.

cPanel (www.cpanel.net) Support put me on to the fact that it could be Glibc version, and after having patched that out with the f16 packages the build completes in the same way however loading the PDO module works fine.

The only way to tell that it has any issues at all are to execute the php application from the command line where one is presented with the error message: "Illegal instruction".

Where does it crash?

Since RHEL 6.2 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.

*** This bug has been marked as a duplicate of bug 752122 ***