signed is undefined and has been since 1992 (in GCC)

[Robert Dewar]

Gabriel Dos Reis wrote:

> But the compiler miscompiled the Unix kernel -- which, apart from has
> history intermixed with the C language design, was relying on
> "undocumented" aspect of "undefined behaviour".  Nobdoy was willing to
> buy the compiler.  The company ran out of business.

Could you please give a proper reference on this, it would be interesting
to know that this is a real story, and not just legend :-)