On Fri, 8 May 2015, Bernd Edlinger wrote:

> But it made the in-tree gmp configure script fail.  That would not
> have happened if we did not pass our version of missing to a sub-
> module like gmp, that already has a working missing script that behaves
> differently.

However, that's still not an argument for a downgrade of the toplevel copy 
of "missing" to an older version.  We can't possibly match toplevel 
scripts to subdirectories not shipped with GCC, since we want to support 
multiple versions of libraries such as GMP, which may each require a 
different version of such a script if the script makes incompatible 
changes; we can only ensure that they get configured in ways sufficiently 
isolated from GCC itself.

-- 
Joseph S. Myers
joseph@codesourcery.com