Lots of changes from David Mosberger-Tang; see ChangeLog and NOTES for details:

Alpha support.
Long options.
New file format to support more information; backwards compatibility.
Line-level profiling, on systems where bfd_find_nearest_line works.
Selective display of data.

gprof/TEST

@@ -0,0 +1,7 @@
+- check whether old file format is properly read when input comes from
+  stdin
+
+- check whether underscores are properly dealt with (both, on systems
+  that prepend them to each C name and on systems that don't)
+
+- ensure gprof fails gracefully when no debugging info available