Should --with-build-sysroot be default to --with-sysroot?

[NightStrike]

Under what conditions does it fail?  We use it daily at mingw-w64.

On Fri, May 25, 2012 at 2:33 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> When --with-sysroot is used to configure gcc, build will usually fail
> if  --with-build-sysroot isn't set.  Should  --with-build-sysroot be set to
> the same value as --with-sysroot by default if --with-sysroot is used?
>
>
> --
> H.J.