Bart De VOS pointed out that removing absolute paths from the libc linker scripts is plainly wrong.
It dates from dawn ages of the original crosstool code, and is not well explained. At that time, binutils might not understand the sysroot stuff, and it was necessary to remove absolute paths in that case.

/trunk/scripts/build/libc/glibc.sh | 14 2 12 0 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)

 # Kernel options

 menu "Operating System"

 config KERNEL

     string

 config KERNEL_VERSION

     string

 choice

     bool

     prompt "Target OS"

 source config.gen/kernel.in

 endchoice

 endmenu