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Bad compiler flags are used; which (apart from loosing performance optimizations and security protections such as stack protector and _FORTIFY_SOURCE) causes -debuginfo to contain empty files instead of ones with debugging symbols.

I've found that out while having a gvfs-dav crash which traced back into avahi client library, which I've been unable to debug further due this problem.

A proposed spec file fix:

-make %{?_smp_mflags} -fno-strict-aliasing"
+make %{?_smp_mflags} CFLAGS="%{optflags} -fno-strict-aliasing"

Since RHEL 6.1 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.

*** Bug 679661 has been marked as a duplicate of this bug. ***

Despite the comment #2, the change fixing avahi spec to use standard rpm CFLAGS was already committed and should be in 6.1.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0779.html