Status and rationale for toplevel bootstrap (was Re: Example of debugging GCC with toplevel bootstrap)

[Daniel Jacobowitz]

On Mon, Jan 16, 2006 at 01:52:43PM +0100, Paolo Bonzini wrote:
> I can see how a compiler bug, that manifests as a miscompilation of the 
> assembler, triggers a bootstrap failure if you also build the assembler 
> three times, each time using the previous compiler *and* assembler.

For the record, this is non-hypothetical.  It happened to me a few
weeks ago - if I'd been bootstrapping in a combined tree, stage1 gcc
would have miscompiled stage2 as which would have misassembled stage2
gcc.

-- 
Daniel Jacobowitz
CodeSourcery