GDB 7.4 --with-python doesn't like d:/foo/bar

[Eli Zaretskii]

> Date: Fri, 27 Jan 2012 09:25:15 +0400
> From: Joel Brobecker <brobecker@adacore.com>
> Cc: gdb-patches@sourceware.org, eliz@gnu.org
> 
> To me, the change would not be completely correct on Unix hosts,
> but I think that the chances of someone calling a local directory
> a single-letter followed by a colon are very small. So I think
> it's OK.

This is a standard way of Autoconf's catering to DOS and Windows
platforms.  You can see it at work elsewhere in the configure script,
because it's part of AC_PROG_PATH.  In fact, you can find it just a
few lines below the test that failed.

> I changed the expressions a bit replacing "[\\/]*" back into just "/"
> as originally used. Eli, would that still work for you?

Again, I think consistency with AC_PROG_PATH is better, even though a
case of a single backslash starting an absolute file name on Windows
is extremely rare.

Thanks.