mpz_get_str triggers stack overflow

[Ken Kahn]

Greetings,

The following code causes a stack overflow:

mpz_t ten_to_the_millionth;
mpz_init(ten_to_the_millionth);
mpz_ui_pow_ui(ten_to_the_millionth,10,1000000);
char *string = mpz_get_str(NULL,10,ten_to_the_millionth);

Changing 1000000 to 100000 and it runs fine.

I am using the gmp.dll (4.1.2) I obtained from 
http://www.cs.nyu.edu/exact/core/gmp/ . I'm running Windows XP and 
Visual Studio .NET.

The exact error is:

Unhandled exception at 0x0033e837 in toontalk.exe: 0xC00000FD: Stack 
overflow.

The Microsoft compiler uses a 1 MB stack by default. Increasing it to 10 
MB fixes this problem until I need 10 to 10,000,000. (It works for 10 to 
the 3,000,000 and fails for 5,000,000.)

Is it that the mpz_get_str is recursive and needs a stack a bit larger 
than the resulting string? Is there any workaround? At least this should 
be documented, right?

Best,

-ken kahn