Any "writef" or "writefln" produces segmentation fault on DMD 2.049 on OS X 10.5.8

[RedZone908]

Hello.

Maybe something's wrong with my configuration, but... I had been working on a
project under DMD 2.046.  It was correctly running under that.  Then I
upgraded to 2.047.  Suddenly the project produced segmentation faults with not
much of an explanation.  Frustrated, I left the project and returned to it
today, upgrading to 2.049.  I did a little more investigating and created a
simple hello world program, and found that "writef" and "writefln" were what
was producing the segmentation fault.  Just plain "write" worked.  GDB
produces this error when I use "writef":

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x00000000
0x0000e3c5 in __tls_get_addr ()


Incidentally, the new "readf" function produces segmentation faults as well.
Here's what happens:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x00000000
0x0000ea55 in __tls_get_addr ()

I don't know if these errors are really bugs or if something's wrong with my
configuration (which, as far as I can tell, is the default).  All I know is
that up until 2.046 everything worked and all of a sudden now the formatted
i/o functions produce segmenation faults.