Hi,

As you might guess, this patch adds support to MI for using explicit 
locations instead of/in addition to linespecs:

(gdb)
-break-insert -m main -o +3 -s main.c -l my_label

One not-so-obvious-but-important fact to note, this change permits 
dprintf to use explicit locations, too.

Once again, since this patch adds new functionality, it includes tests.

Keith

ChangeLog
2014-05-08  Keith Seitz  <keiths@redhat.com>

	* mi/mi-cmd-break.c (mi_cmd_break_insert_1): Add support for
	explicit locations, options "-s", "-m", "-l", and "-o".

testsuite/ChangeLog
2014-05-08  Keith Seitz  <keiths@redhat.com>

	* gdb.mi/mi-break.exp (test_explicit_breakpoints): New proc.
	(at toplevel): Call test_explicit_breakpoints.
	* gdb.mi/mi-dprintf.exp: Add tests for explicit dprintf
	breakpoints.
	* lib/mi-support.exp (mi_make_breakpoint): Add support for
	breakpoint conditions, "-cond".