sorry, unimplemented: Graphite loop optimizations cannot be used

[dE <de dot techno at gmail dot com>]

Hi!
    I'm using Gentoo where I'm trying to enable graphite but gcc 
complains --

"sorry, unimplemented: Graphite loop optimizations cannot be used"

On most packages.

As suggested in a no. of discussions, I've dev-libs/cloog-0.18.4 and 
ppl-1.1 installed. They're built without graphite enabled (they fail to 
compile with graphite giving the same problem as above). gcc was built 
with graphite support. I compiled GCC after upgrading cloog and ppl.

CFLAGS:

-march=native -floop-interchange -floop-strip-mine -floop-block 
-fgraphite-identity -ftree-loop-distribution -O2

Code:
gcc-5.3.0 -v
Using built-in specs.
COLLECT_GCC=gcc-5.3.0
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/5.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: 
/tmp/portage/sys-devel/gcc-5.3.0/work/gcc-5.3.0/configure 
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr 
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/5.3.0 
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/include 
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.3.0 
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.3.0/man 
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.3.0/info 
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/include/g++-v5 
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/5.3.0/python 
--enable-languages=c,c++ --enable-obsolete --enable-secureplt 
--disable-werror --with-system-zlib --disable-nls 
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/ 
--with-pkgversion='Gentoo 5.3.0 p1.0, pie-0.6.5' --enable-libstdcxx-time 
--enable-shared --enable-threads=posix --enable-__cxa_atexit 
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 
--disable-altivec --disable-fixed-point --enable-targets=all 
--disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp 
--disable-libcilkrts --disable-libquadmath --enable-lto --with-isl 
--disable-isl-version-check --disable-libsanitizer --with-cloog --with-ppl

Then again I recompiled GCC without graphite support, removed cloog, 
isl, ppl, then recompiled GCC with graphite support and then compiled 
cloog, isl, ppl.

All this using gold linker.