2016-10-06  Sandra Loosemore  <sandra@codesourcery.com>

	PR gdb/20569
	gdb/
	* exceptions.c (exception_print_same): Moved here from exec.c.
	Fixed message comparison.
	* exceptions.h (exception_print_same): Declare.
	* exec_file_locate_attach (exception_print_same): Delete copy here.
	(exec_file_locate_attach): Rename exec_file and full_exec_path
	variables to avoid confusion between target and host pathnames.  
	Move pathname processing logic to exec_file_find.  Do not return 
	early if pathname lookup fails;	guard symbol_file_add_main call 
	instead.
	* infrun.c (follow_exec): Split and rename execd_pathname variable
	to avoid confusion between target and host pathnames.  Replace 
	brokenpathname copy with cleanup to free malloc'ed string.  Warn 
	if pathname lookup fails.  Pass target pathname to 
	target_follow_exec, not hostpathname.  Borrow exception-handling 
	logic from exec_file_locate_attach.
	* solib.c (exec_file_find): Incorporate fallback logic for relative
	pathnames formerly in exec_file_locate_attach.