PR c++/15176:

	PR c++/15176:
	* NEWS: Update.
	* break-catch-throw.c (compute_exception): New function.
	(exception_funcs): New global.
	(_initialize_break_catch_throw): Create $_exception.
	* cp-abi.c (cplus_type_from_type_info): New function.
	* cp-abi.h (cplus_type_from_type_info): Declare.
	(struct cp_abi_ops) <get_type_from_type_info>: New field.
	* gnu-v3-abi.c (gnuv3_get_typename_from_type_info)
	(gnuv3_get_type_from_type_info): New functions.
	(init_gnuv3_ops): Set get_type_from_type_info ABI field.
gdb/doc
	* gdb.texinfo (Set Catchpoints): Document $_exception.
	(Convenience Vars): Mention $_exception.
gdb/testsuite
	* gdb.base/default.exp: Update for $_exception.
	* gdb.cp/exceptprint.cc: New file.
	* gdb.cp/exceptprint.exp: New file.
	* lib/gdb.exp (skip_libstdcxx_probe_tests): New proc.