Finally used the discovered paths from ./configure in scripts/crosstool-NG.sh:
- fix Makefile to really, really not used built-in rules and variables
- have scripts/crosstool-NG.sh generated from scripts/crosstool-NG.sh.in
- create a bin-overide directory ( in ${CT_WORK_DIR}/bin ) that contains shell wrappers to the actual discovered tools

/trunk/scripts/crosstool-NG.sh.in | 27 23 4 0 +++++++++++++++++++++---
/trunk/Makefile.in | 50 48 2 0 +++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 71 insertions(+), 6 deletions(-)

 # Kernel options

 menu "Operating System"

 # Config option used throughout the config and code to determine wether

 # we have a kernel or not (there might be different bare metal stuff...

 config BARE_METAL

     bool

     default n

 config KERNEL

     string

 config KERNEL_VERSION

     string

 source config.gen/kernel.in

 endmenu