GCC installation script (with pre-installed prerequisites)

install-gcc.sh

#!/bin/bash -e

#-------------------------------------------------------------------------------
# Default values
#-------------------------------------------------------------------------------
: ${GCC_VERSION:=$1}
: ${LANGUAGES:=c,c++,fortran}
: ${MPFR_HOME:=}
: ${GMP_HOME:=}
: ${MPC_HOME:=}
: ${DESTDIR:=$(pwd)}
: ${PREFIX:=${DESTDIR}/${GCC_VERSION}}
: ${WORKSPACE:=${PREFIX}/workspace}
: ${BUILDDIR:=${WORKSPACE}/build}

#-------------------------------------------------------------------------------
# Sanity Checks
#-------------------------------------------------------------------------------
if [ -z "${GCC_VERSION}" ]; then
  echo "Usage: $0 <version: 4.7.2>"
  exit 1
fi

if [ -z "${MPFR_HOME}" -o ! -d "${MPFR_HOME}" ]; then
  echo "[FATAL] \$MPFR_HOME is not set or does not exist"
  exit 1
fi

if [ -z "${GMP_HOME}" -o ! -d "${GMP_HOME}" ]; then
  echo "[FATAL] \$GMP_HOME is not set or does not exist"
  exit 1
fi

if [ -z "${MPC_HOME}" -o ! -d "${MPC_HOME}" ]; then
  echo "[FATAL] \$MPC_HOME is not set or does not exist"
  exit 1
fi

#-------------------------------------------------------------------------------
# Meta Information
#-------------------------------------------------------------------------------
TARBALL="gcc-${GCC_VERSION}.tar.gz"
DOWNLOAD_URL="http://www.netgull.com/gcc/releases/gcc-${GCC_VERSION}/${TARBALL}"
# Alternate mirror in St. Louis: "http://gcc.petsads.us/releases/gcc-${GCC_VERSION}/${TARBALL}"

echo "[INFO] GCC '$GCC_VERSION'"

#-------------------------------------------------------------------------------
# Workspace
#-------------------------------------------------------------------------------

mkdir -p "${WORKSPACE}" || exit 1
pushd    "${WORKSPACE}" || exit 1
SRCDIR="${WORKSPACE}/gcc-$VERSION"

#-------------------------------------------------------------------------------
# Download and unpack
#-------------------------------------------------------------------------------
if [ ! -f "$TARBALL" ]; then
    echo "[INFO] Downloading '$DOWNLOAD_URL'"
    wget --no-check-certificate "$DOWNLOAD_URL" || exit 1
else
    echo "[INFO] '$TARBALL' already exists. Skipping..."
fi

if [ ! -d "$SRCDIR" ]; then
    echo "[INFO] Unpacking '$TARBALL'"
    tar xzf "$TARBALL" || exit 1
else
    echo "[INFO] '$SRCDIR' already exists. Skipping..."
fi

#-------------------------------------------------------------------------------
# Build and install
#-------------------------------------------------------------------------------
mkdir -p "${BUILDDIR}" || exit 1
pushd    "${BUILDDIR}" || exit 1

if [ ! -e "${PREFIX}/bin" ]; then
    echo "[INFO] Configuring GCC"
    echo "[INFO] Installing to '$PREFIX'"
    echo "[INFO] Building GCC with support for '${LANGUAGES}'"
    echo "[INFO] \$GMP_HOME='${GMP_HOME}'"
    echo "[INFO] \$MPFR_HOME='${MPFR_HOME}'"
    echo "[INFO] \$MPC_HOME='${MPC_HOME}'"

    "${SOURCE}/configure" \
        --prefix="$PREFIX" \
        --enable-languages="${LANGUAGES}" \
        --with-gmp="${GMP_HOME}" \
        --with-mpfr="${MPFR_HOME}" \
        --with-mpc="${MPC_HOME}" || exit 1

    make -j || exit 1
    make -j install || exit 1

    if [ "$(uname --machine)" = "x86_64" ]; then
        export LIBDIR="lib64"
    else
        export LIBDIR="lib"
    fi

    echo "[INFO] Creating GCC environment setup file"
    cat > "${PREFIX}/setup.sh" <<-EOF
#!/bin/bash
#
# Automatically generated by $0 on $(date)
export GCC_HOME="${PREFIX}"

export PATH="\${GCC_HOME}/bin:\${PATH}"
export LD_LIBRARY_PATH="\${GCC_HOME}/${LIBDIR}:\${LD_LIBRARY_PATH}"

export GMP_HOME="${GMP_HOME}"
export LD_LIBRARY_PATH="\${GMP_HOME}/lib:\${LD_LIBRARY_PATH}"

export MPC_HOME="${MPC_HOME}"
export LD_LIBRARY_PATH="\${MPC_HOME}/lib:\${LD_LIBRARY_PATH}"

export MPFR_HOME="${MPFR_HOME}"
export LD_LIBRARY_PATH="\${MPFR_HOME}/lib:\${LD_LIBRARY_PATH}"
EOF

    #-----------------------------------------------
    # Set Permissions
    #-----------------------------------------------
    chmod -R g+r "${PREFIX}"
    chmod -R g+x "${PREFIX}/bin"
    find "${PREFIX}" -type d -exec chmod g+x {} \;

    echo "[INFO] Successfully installed GCC version '${GCC_VERSION}' with support for '${LANGUAGES}'"
    echo "[INFO] \$GMP_HOME='${GMP_HOME}'"
    echo "[INFO] \$MPFR_HOME='${MPFR_HOME}'"
    echo "[INFO] \$MPC_HOME='${MPC_HOME}'"
    echo "[INFO] \$PREFIX='${PREFIX}'"
    echo "[INFO]
else
    echo "[INFO] Installation already exists in '$PREFIX'. Skipping..."
fi