generalized lvalues -- patch outline

[Daniel Berlin]

> FWIW, this extension is used in at least (determined from just looking at
> the compiler errors):
> wine, elfutils, rpm, freeglut, dietlibc, openswan, xv, xine and 50 other
> packages.

When you say used the extension, do you mean *intentionally* (IE it's in 
code that is part of the package), or is the extension part of code they 
include/link with from other packages (ie glibc, etc)