configure.{in -> ac} rename (commit 35eafcc71b) broke in-tree binutils building of gcc

[H.J. Lu]

On Tue, Jul 14, 2015 at 10:03 AM, Jim Wilson <jim.wilson@linaro.org> wrote:
> On 07/14/2015 02:13 AM, Jan Beulich wrote:
>> I was quite surprised for my gcc 4.9.3 build (using binutils 2.25 instead
>> of 2.24 as I had in use with 4.9.2) to fail in rather obscure ways.
>
> in-tree/combined-tree builds aren't recommended anymore, and hence
> aren't well maintained anymore.  That is an anachronism from the old
> Cygnus days.  I still find it useful to drop newlib into gcc so it can
> be built like the other gcc libs, but otherwise I wouldn't recommend
> combining anything.

Combined tree is useful when the latest binutils is needed by GCC.

-- 
H.J.