tce-load -i libffi-dev python-dev

cd llvm-3.7.0.src

tar -xf ../cfe-3.7.0.src.tar.xz -C tools
tar -xf ../compiler-rt-3.7.0.src.tar.xz -C projects

mv tools/cfe-3.7.0.src tools/clang
mv projects/compiler-rt-3.7.0.src projects/compiler-rt

mkdir build
cd build

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ../configure --prefix=/usr/local -disable-static --localstatedir=/var --datarootdir=/usr/local/share --enable-libffi --enable-optimized --enable-shared --enable-targets=host,r600,amdgpu --disable-assertions --docdir=/usr/local/share/doc/llvm-3.7.0

find . -name Makefile.config -type f -exec sed -i 's/-O3//g' {} \;

make [real 2h 0m 42s]
make install

sudo chmod 644 /usr/local/lib/libLLVM*.a
sudo chmod 644 /usr/local/lib/libLTO*.a
sudo chmod 644 /usr/local/lib/libclang*.a

sudo install -dm755 /usr/local/lib/clang-analyzer

for prog in scan-build scan-view
do
  cp -rf ../tools/clang/tools/$prog /usr/local/lib/clang-analyzer/
  ln -sf ../lib/clang-analyzer/$prog/$prog /usr/local/bin/
done
unset prog

sudo ln -sf /usr/local/bin/clang /usr/local/lib/clang-analyzer/scan-build/

config.log
...
clang: warning: optimization flag '-fuse-linker-plugin' is not supported
clang: warning: argument unused during compilation: '-fuse-linker-plugin'
/usr/local/bin/ld: /tmp/tcloop/clang/usr/local/bin/../lib/LLVMgold.so: error loading plugin: /tmp/tcloop/clang/usr/local/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory