How do I tell gdb how long my zero-length array is?

Slightly oxymoronic title! Bonus points for Xcode answer but it's a gdb question.

If I have a standard, statically sized array gdb will print all its elements [and Xcode will let me browse through it] bu开发者_高级运维t if I have a zero length array, it won't, because it doesn't know. Obviously I can print the array indexes one by one, but I'd like a dump of the whole thing.

How do I tell gdb how much space I have allocated for the array to allow it to print the array (or to allow Xcode to view the array). Is it even possible?

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http://www.chemie.fu-berlin.de/chemnet/use/info/gdb/gdb_9.html#SEC54

Discusses "Artificial arrays"

It is often useful to print out several successive objects of the same type in memory;...

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If s->a has type char [0] (which is a gcc extension), but you know it is really an array of 100, you can use casts in gdb to print it:

(gdb) print *(char (*)[100])&s->a

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See 10.4 Artificial Arrays:

(gdb) p *argv@argc