Build llvm-clang on Ubuntu 14.04.6 LTS, Trusty Tahr

#!/bin/sh
maj_ver=8
min_ver=0
patch_ver=0
version=${maj_ver}.${min_ver}.${patch_ver}

#?apt-get install -y zlib1g-dev libncurses5-dev bison cmake3 flex make \
#?        libxml2-dev libelf-dev curl

Source0=http://llvm.org/releases/${version}/llvm-${version}.src.tar.xz
Source1=http://llvm.org/releases/${version}/cfe-${version}.src.tar.xz

set -e
set -x

# Download
n=0
for Source in "$Source0" "$Source1"; do
        File="${Source##*/}"
        eval File$n=\"\$File\"
        n=$(( $n + 1 ))
        [ -e "$File" ] || curl -kLo "$File" "$Source"
done

# Unpack
n=0
for File in "$File0" "$File1"; do
        Dir="${File%.tar.xz}"
        eval Dir$n=\"\$Dir\"
        n=$(( $n + 1 ))
        [ -e "$Dir" ] || tar Jxf "$File"
done

# Prep
[ -e "$Dir0/tools/clang" ] || ln -sf "../../$Dir1" "$Dir0/tools/clang"
[ -e "$Dir0/build" ] || mkdir "$Dir0/build"
cd "$Dir0"

# Build
cd build
[ -e Makefile ] || cmake .. \
    -DBUILD_SHARED_LIBS=OFF \
    -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON \
    -DLLVM_BUILD_LLVM_DYLIB=ON \
    -DLIBCLANG_BUILD_STATIC=ON \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DLLVM_LIBDIR_SUFFIX= \
    -DCLANG_BUILD_EXAMPLES=OFF \
    -DCLANG_INCLUDE_DOCS=OFF \
    -DCLANG_INCLUDE_TESTS=OFF \
    -DLLVM_APPEND_VC_REV=OFF \
    -DLLVM_BUILD_DOCS=OFF \
    -DLLVM_BUILD_EXAMPLES=OFF \
    -DLLVM_BUILD_TESTS=OFF \
    -DLLVM_BUILD_TOOLS=ON \
    -DLLVM_ENABLE_ASSERTIONS=OFF \
    -DLLVM_ENABLE_CXX1Y=ON \
    -DLLVM_ENABLE_EH=ON \
    -DLLVM_ENABLE_LIBCXX=OFF \
    -DLLVM_ENABLE_PIC=ON \
    -DLLVM_ENABLE_RTTI=ON \
    -DLLVM_ENABLE_SPHINX=OFF \
    -DLLVM_ENABLE_TERMINFO=OFF \
    -DLLVM_INCLUDE_DOCS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DLLVM_INCLUDE_GO_TESTS=OFF \
    -DLLVM_INCLUDE_TESTS=OFF \
    -DLLVM_INCLUDE_TOOLS=ON \
    -DLLVM_INCLUDE_UTILS=OFF \
    -DLLVM_PARALLEL_LINK_JOBS=1 \
    -DLLVM_TARGETS_TO_BUILD="host;BPF"
[ -e lib/libbenchmark_main.a ] || make

# Install
if [ ! -e /usr/lib/libclang.a ]; then
        make install
        cp lib/libclang.a /usr/lib/libclang.a
        /sbin/ldconfig
fi

# Done
: Success1