MI -var-create frame-addr specification

[Christophe LYON]

Hi all,

Currently, the test gdb.mi/mi-var-display.exp fails with our compiler on 
"create variable a2 in different scope".

I am not very familiar with MI, and I don't understand well how the 
"frame-addr" parameter works?
Shouldn't a "frame" be represented by a PC,FP pair, instead of only FP?

Indeed, our ABI allows not to allocate space on the stack when entering 
a function if it does not need any space. In the testcase, the incr_a() 
function is very small, and does not require reserving space on the stack.

Thus, $fp has the same value in incr_a() and in do_special_tests(), so 
it's not sufficient to determine the scope of "a" when issuing 
"-var-create a2 $fp a".

Is this a limitation of MI? Am I missing something?

Thanks for your feedback,

Christophe.