debian/: add compat.sh file containing compatibility logic for older Debian and Ubuntu versions.

debian/compat.sh

+#!/bin/bash
+
+# This script employs compatibility measures, mainly for older Debian
+# or Ubuntu versions.
+typeset -a compat_shims_all compat_shims_active
+compat_shims_all=("Wpedantic")
+compat_shims_active=()
+
+typeset debian_release_ver=''
+typeset -i ubuntu_release_ver_major='0' ubuntu_release_ver_minor='0'
+
+# Check distro version and enable compat shims if required.
+if dpkg-vendor --is "Debian" || dpkg-vendor --is "Raspbian"; then
+  debian_release_ver="$(lsb_release -r | sed -e 's/[	 ]*//g' | cut -d ':' -f '2' | cut -d '.' -f '1')"
+
+  [[ "${debian_release_ver}" = 'testing' ]] && debian_release_ver='999'
+  [[ "${debian_release_ver}" = 'unstable' ]] && debian_release_ver='9999'
+
+  if [[ "${debian_release_ver}" -le '7' ]]; then
+    compat_shims_active+=("Wpedantic")
+  fi
+elif dpkg-vendor --is "Ubuntu"; then
+  ubuntu_release_ver_major="$(lsb_release -r | sed -e 's/[	 ]*//g' | cut -d ':' -f '2' | cut -d '.' -f '1')"
+  ubuntu_release_ver_minor="$(lsb_release -r | sed -e 's/[	 ]*//g' | cut -d ':' -f '2' | cut -d '.' -f '2')"
+
+  if [[ "${ubuntu_release_ver_major}" -le '13' ]]; then
+    if [[ "${ubuntu_release_ver_major}" -lt '13' ]] || [[ "${ubuntu_release_ver_minor}" -le '4' ]]; then
+      compat_shims_active+=("Wpedantic")
+    fi
+  fi
+fi
+
+
+# Apply enabled compat shims.
+# Ignore unknown values.
+typeset cur_compat_shim='' cur_enabled_compat_shim=''
+for cur_compat_shim in "${compat_shims_all[@]}"; do
+  for cur_enabled_compat_shim in "${compat_shims_active[@]}"; do
+    if [[ "${cur_compat_shim}" = "${cur_enabled_compat_shim}" ]]; then
+      if [[ "${cur_compat_shim}" = 'Wpedantic' ]]; then
+        sed -i -e 's/Wpedantic/pedantic/g' nx-X11/config/cf/{{host,xorgsite}.def,xorg.cf}
+        continue
+      fi
+    fi
+  done
+done