#!/bin/bash
set -euo pipefail

prefix=/usr/grte/v5
libdir="${prefix}/lib64"

# Install the build tools
export DEBIAN_FRONTEND=noninteractive
apt-get update -qq
apt-get install -y -qq --no-install-recommends build-essential gawk bison python3 git texinfo ca-certificates > /dev/null

# Get the GRTE v5 source, Google's glibc 2.27
git clone --depth 1 https://third-party-mirror.googlesource.com/GRTEv5 /src

# Build the libraries in the library directory searched by the GRTE v5 loader
mkdir /build
cd /build
cat > configparms <<EOF
slibdir=${libdir}
rtlddir=${libdir}
EOF
/src/google3/third_party/grte/v5_src/glibc-2.27/configure \
    --prefix="${prefix}" \
    --libdir="${libdir}" \
    --disable-werror \
    --enable-kernel=3.2
make -j"$(nproc)"
make install DESTDIR=/out

ls -l "/out${libdir}/libc.so.6" "/out${libdir}/libm.so.6" "/out${libdir}/libpthread.so.0" "/out${libdir}/ld-linux-x86-64.so.2"