The attached patch adds basic libunwind frame support.  I will be shortly 
submitting an ia64-tdep.c patch which works in conjunction with this patch.  The 
libunwind code is protected by looking for the libunwind header files to 
compile.  At runtime, the libunwind frame sniffer will fail if either the 
libunwind library cannot be dynamically loaded or the frame in question does not 
have proper libunwind info.

For configuration I have added checks for libunwind.h and libunwind-ia64.h as 
this is being added for ia64 support only at present.  Regarding testing, I have 
this code working with my ia64 changes.  I have tested on systems with the 
libunwind-0.92 library/headers installed and not installed.

Ok to commit?

2003-10-15  Jeff Johnston  <jjohnstn@redhat.com>

	* libunwind-frame.c: New file.
	* libunwind-frame.h: New file.
	* configure.in: Add checks for libunwind.h and libunwind-ia64.h.
	* configure: Regenerated.
	* Makefile.in: Add support for libunwind-frame.o.
	* config.in: Regenerated.