Re: PATCH: --with-build-sysroot, et. al.

[Mark Mitchell <mark at codesourcery dot com>]

Geoffrey Keating wrote:
> Mark Mitchell <mark@codesourcery.com> writes:
>
>
> > Geoffrey Keating wrote:
> >
> > > Mark Mitchell <mark@codesourcery.com> writes:
> > >
> > >
> > > > + The GNU linker (beginning with version 2.16) has the necessary support
> > > > + for this option.  If your linker does not support this option, the
> > > > + header file aspect of @option{--sysroot} will still work, but the
> > > > + library aspect will not.
> > >
> > > This is a regression on Darwin; there, -isysroot already passes
> > > -syslibroot to the linker.
> >
> > I didn't change anything about what -isysroot does; if on Darwin it
> > has extra semantics, then it still should.  Is that not true?
>
> The regression is that now the documentation doesn't match the
> implementation...

I think the documentation is accurate.

As far as I can tell from looking at the mainline sources, the Darwin 
linker does not support --sysroot (it uses some other name), and the 
configure script does not set HAVE_LD_SYSROOT on Darwin, so the driver 
--sysroot option does not work on Darwin when linking.  If someone 
changes the driver so that on Darwin --sysroot translates into the right 
linker option, then the documentation will need updating too.

Are you saying that the --sysroot driver option works on Darwin?

--
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304