Hi,

I'm getting these intermitent FAILures in mi-break.exp (and a couple
more in chain reaction) in sync mode, due to previous pattern
considering the gdb prompt optional, hence sometimes consuming the
*stopped line, and leaving the (gdb) unconsumed.

Running ../../../src/gdb/testsuite/gdb.mi/mi-break.exp ...
FAIL: gdb.mi/mi-break.exp: breakpoint at nonexistent function
FAIL: gdb.mi/mi-break.exp: create varobj for function call
FAIL: gdb.mi/mi-break.exp: update varobj for function call


220-exec-run 
220^running
(gdb) 
=thread-created,id="1"
*running,thread-id="1"
Hello, World!callme
*stopped,reason="breakpoint-hit",disp="keep",bkptno="5",thread-id="1",frame={addr="0x08048441",func="callme",args=[{name="i",value="2"}],file="../../../src/gdb/testsuite/gdb.mi/basics.c",fullname="/home/pedro/gdb/nonstop_head/src/gdb/testsuite/gdb.mi/basics.c",line="51"}
PASS: gdb.mi/mi-break.exp: run to breakpoint with ignore count
-break-insert function_that_does_not_exist
(gdb) 
FAIL: gdb.mi/mi-break.exp: breakpoint at nonexistent function
-var-create V * return_1()
^error,msg="Function \"function_that_does_not_exist\" not defined."

vs

220-exec-run 
220^running
(gdb) 
=thread-created,id="1"
*running,thread-id="1"
Hello, World!callme
*stopped,reason="breakpoint-hit",disp="keep",bkptno="5",thread-id="1",frame={addr="0x08048441",func="callme",args=[{name="i",value="2"}],file="../../../src/gdb/testsuite/gdb.mi/basics.c",fullname="/home/pedro/gdb/nonstop_head/src/gdb/testsuite/gdb.mi/basics.c",line="51"}
(gdb) 
PASS: gdb.mi/mi-break.exp: run to breakpoint with ignore count
-break-insert function_that_does_not_exist
^error,msg="Function \"function_that_does_not_exist\" not defined."
(gdb) 
PASS: gdb.mi/mi-break.exp: breakpoint at nonexistent function


The attached fixes it for me.

-- 
Pedro Alves