change VCS's base image to Ubuntu 16.04

** TODOs
* future VCS version could be compatible with latest OSes
* remove x86 related VCS files to reduce image size
* make 'vcs' command always comes with '-full64' option
  - 'VCS_TARGET_ARCH' option with 'amd64' was not effective
* use actually required packages rather than 'build-essential' metapackage

Dockerfile_Synopsys_VCS

@@ -1,6 +1,12 @@
-# TODO hmm... VCS did not operates smoothly in native Ubuntu 17.04/10... OK for 16.04
-
-FROM ubuntu:18.04 AS installer
+# Synopsys VCS cannot be executed in Ubuntu 18.04 & VCS N-2017.12
+# - in generating binary stage, 'undefined symbol relocation' error in g++ happened...
+#
+# TODO with latest version, we can use more recent Ubuntu image, which reduces docker image size
+# TODO remove x86 related files in VCS (almost 3 GiB) to reduce image size
+# TODO how to make 'vcs' always have '-full64' option?
+# TODO rather than 'build-essential' metapackage, use lighter and essential packages to compile simulation binary
+
+FROM ubuntu:16.04 AS installer
 ARG repo_sed=s#://archive.ubuntu.com#://kr.archive.ubuntu.com#g
 
 # 'cshell' is required to run the installer
@@ -32,7 +38,7 @@ RUN mkdir -p ${base_dir} \
 
 
 # NOTE using multi-stage image build; avoid including installer package in the final image
-FROM ubuntu:18.04
+FROM ubuntu:16.04
 ARG repo_sed=s#://archive.ubuntu.com#://kr.archive.ubuntu.com#g
 
 # install required library to run Synopsys tool and X11 library to show GUI
@@ -41,24 +47,17 @@ RUN sed -i -e "${repo_sed}" /etc/apt/sources.list \
     && apt-get install -y --no-install-recommends \
     csh libxss1 libsm6 libice6 libxft2 libjpeg62 libtiff5 libmng2 \
     && apt-get install -y --no-install-recommends xserver-xorg-video-dummy xserver-xorg-input-void xserver-xorg-core xinit x11-xserver-utils \
-    && echo "deb http://security.ubuntu.com/ubuntu xenial-security main" >> /etc/apt/sources.list \
-    && apt-get update \
-    && apt-get install -y -t xenial libpng12-0 \
+    && apt-get install -y --no-install-recommends build-essential dc \
     && rm -rf /var/lib/apt/lists/*
 # # using somewhat lighter X11 package rather than xorg; 'x11-apps' is not applicable
 # ref: https://git.devuan.org/dev1fanboy/Upgrade-Install-Devuan/wikis/minimal-xorg-install
-# # WORKAROUND install libpng12-0 package from Xenial, which is removed from Bionic
-# ref: https://www.linuxuprising.com/2018/05/fix-libpng12-0-missing-in-ubuntu-1804.html
 
 # WORKAROUND link outdated library filename required from Synopsys tools
 # WORKAROUND set default shell as Bash to avoid error from script included in the tool
 RUN ln -s /usr/lib/x86_64-linux-gnu/libtiff.so.5 /usr/lib/x86_64-linux-gnu/libtiff.so.3 \
     && ln -s /usr/lib/x86_64-linux-gnu/libmng.so.2 /usr/lib/x86_64-linux-gnu/libmng.so.1 \
     && update-alternatives --install /bin/sh sh /bin/bash 20
 
-# WORKAROUND Ubuntu 18.04 does not have terminfo files in /usr/share/terminfo/
-RUN cp -r /lib/terminfo/. /usr/share/terminfo/
-
 # copy actual tool to be run in this image
 ARG base_dir=/usr/synopsys
 ARG tool=vcs
@@ -75,5 +74,5 @@ ENV VCS_HOME ${base_dir}/${tool}/${version}
 ENV VCS_TARGET_ARCH "amd64"
 
 # default command when running this image
-CMD "vcs"
+CMD "vcs -full64"