using glibc headers to build bootstrap gcc?

["Robert P. J. Day" <rpjday at mindspring dot com>]

  there appear to be at least three different variations for how to
use the glibc headers to build the bootstrap gcc phase of the
toolchain.

  first, yaghmour's book orders the phases of the build so that the
bootstrap compiler is done before *any* of the glibc stuff.  because
of that, his bootstrap configuration uses the option
"--without-headers".

  if you have already installed the glibc headers, though, another
approach seems to be using a
variation of "--with-headers=${SYSROOT}/usr/include".

  and crosstool takes yet another approach, using the config option
"--with-local-prefix=", which i'm going to guess subsumes
--with-headers=.

  are there substantial differences in the ultimate effect of using
one or the other of the above?

rday

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