general questions about sysroot in building a toolchain

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

  (is there an online tutorial about the purpose and use of sysroot in
building a toolchain somewhere?)

  i'm trying to clarify the use of "sysroot" in both the creation and
use of a toolchain, so a few specific questions.

  first, as i read it, if you build a toolchain with USE_SYSROOT=1,
you'll create a "sys-root" directory that, in part, represents a
chroot-style, target-based directory.  WRT to crosstool, this
directory is initialized with the appropriate kernel header files and
is then used by subsequent build steps, right?

  second, is this sysroot directory necessary for the subsequent *use*
of the toolchain?  (i recall reading somewhere that the actual
location of the sysroot directory is *hard-coded* into the eventual
executables.)

  that should do for now.

rday

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