process will be the default target.
* target.c (find_default_run_target, find_default_attach,
find_default_create_inferior, return_zero): new functions.
(cleanup_target): Make return_zero the default for to_can_run.
* exec.c (exec_ops), core.c (core_ops): Replace child_attach and
child_create_inferior references with find_default_XXX instead.
* target.h (struct target_ops): new field, to_can_run.
(find_default_attach, find_default_create_inferior): new prototypes.
(target_can_run): new macro.
* Also added a zero (default) to_can_run element to all static
struct target_ops initializations throughout GDB, except:
* inftarg.c (child_ops): Use new child_can_run() to enable child runs.
* infrun.c (child_create_inferior): Clean up error handling when
no exec file is specified.
(child_attach): Don't require exec file.
* All GDB files that #include defs.h: Removed stdio.h.
(defs.h): #include stdio.h.
This has been tested by building GDBs for all targets hosted on Sun4.
None of the build problems were related to stdio.h inclusion. (n.b.
many configurations don't build for other reasons.)
remote-hms.c, remote-mm.c, remote-nindy.c, remote-vx.c, remote.c,
target.c, target.h, valarith.c, valops.c, value.h, xcoffexec.c:
Remove to_call_function and target_call_function, since it
always calls the same thing (call_function_by_hand).
