Re: [discuss] --with-sysroot required when building 32->64 bit crosstoolchain?(was: building a cross-compiler is hard)

[Daniel Kegel <dkegel at google dot com>]

Alan Modra wrote:
> On Wed, Jan 07, 2004 at 08:06:15PM -0500, Raul Miller wrote:
>
> > On Wed, Jan 07, 2004 at 04:38:05PM -0800, Daniel Kegel wrote:
> >
> > > BTW, why do you build glibc twice? 
> >
> > I thought it was important at one point, but I forget why.
>
>
> It's needed when bootstrapping glibc, ie. if you don't have a previous
> libc and crt* files available.  The trouble is that building a shared
> glibc requires crt* to build, and the glibc build machinery isn't
> clever enough to pick up newly built crt* files.  Also, gcc's configure
> makes use of AC_TRY_LINK, which again needs crt files.  :-(

I haven't run into those problems, I think.
In http://kegel.com/crosstool, I do
  * install glibc headers
  * build bootstrap gcc
  * build and install glibc
  * build and install final gcc
and I happily get a shared glibc that passes the glibc regression tests.

I seem to recall that one reason people used to build glibc twice was to get the
paths right, but that's not really neccessary if you
override install_root when doing 'make install' in glibc.

- Dan