Re: [build, lto] Only accept -fuse-linker-plugin if linker supports -plugin (PR lto/46944)

[Richard Guenther <rguenther at suse dot de>]

On Fri, 18 Mar 2011, Rainer Orth wrote:

> Richard Guenther <rguenther@suse.de> writes:
> 
> > It's sort of historic ... with plugin support for GNU ld we can probably
> 
> Could you or someone else who understands this stuff please document it
> in install.texi then?  Thanks.

I'll try.

> > drop this flag for 4.7 (eventually I'd even like to enforce the use
> > of the plugin all the time or disable LTO, just for the sake of reducing
> > the testing and bugreporting matrix ...).
> 
> This would mean no more LTO without GNU ld/gold, then?  Isn't this going
> too far?

I'm not sure - the collect2 path has known issues that are hard
to address and result in unexpected behavior, so it's probably
not a good service to our users to serve them half-broken LTO.

But I suppose we can discuss this when we also see a clear benefit
in removing the corresponding code in gcc.

Richard.
kk