binutils executables capture paths from build machine

Hi!  I'm using crosstool-ng 1.23.0 to make a cross-native toolchain,
and am a bit confused about the configuration and install of the
binutils executables.

I've understood correctly, the bash function do_binutils_for_host
configures binutils with --prefix=${CT_PREFIX_DIR} and installs the
executables with make install.  This procedure results in paths from
the build machine being embedded in the binaries, in at least two
places: the use of BINDIR at binutils-2.28/bfd/plugin.c:337; and
the various uses of DEBUGDIR in binutils-2.28/bfd/dwarf2.c (where
DEBUGDIR=${libdir}/debug; see binutils-2.28/bfd/configure.ac:108).

I would have expected that, for a cross-native (or, for that matter,
Canadian) build, binutils would be configured with --prefix=/usr or
something, then installed with make DESTDIR=${CT_SYSROOT_DIR} install,
for later transfer to the host.  That's what do_binutils_for_target
does, but it seems to build and install only libiberty and libbfd,
not the executables.

For builds with build!=host, how should binutils executables be built?

(Context: I'm developing a small reproducible and self-reproducing
Linux distribution, which requires making a reproducible cross-native
toolchain.  I also think there are some similar issues in the gcc
executables, but haven't tracked those down yet.)

-- 
Steven Taschuk                                     http://www.amotlpaa.org/
Receive them ignorant; dispatch them confused.  (Weschler's Teaching Motto)