Drop direct support for Ubuntu 18.04 and switch to static PPA releases for it.

.circleci/config.yml

@@ -7,10 +7,6 @@
 #     - ems: Emscripten
 version: 2.1
 parameters:
-  ubuntu-1804-docker-image:
-    type: string
-    # solbuildpackpusher/solidity-buildpack-deps:ubuntu1804-4
-    default: "solbuildpackpusher/solidity-buildpack-deps@sha256:79ccaf5a294a3c4f480b2cd69c6d845540c12435e64d732e8536f8f99ad35f03"
   ubuntu-2004-docker-image:
     type: string
     # solbuildpackpusher/solidity-buildpack-deps:ubuntu2004-4
@@ -478,19 +474,6 @@ jobs:
           command: strip build/solc/solc
       - store_artifacts: *artifacts_solc
 
-  b_ubu18: &build_ubuntu1804
-    docker:
-      - image: << pipeline.parameters.ubuntu-1804-docker-image >>
-    environment:
-      CMAKE_OPTIONS: -DCMAKE_CXX_FLAGS=-O2
-      CMAKE_BUILD_TYPE: RelWithDebugInfo
-      MAKEFLAGS: -j 3
-    steps:
-      - checkout
-      - run: *run_build
-      - store_artifacts: *artifacts_solc
-      - persist_to_workspace: *artifacts_executables
-
   b_ubu_codecov:
     <<: *build_ubuntu2004
     environment:
@@ -1164,7 +1147,6 @@ workflows:
 
       # Ubuntu build and tests
       - b_ubu: *workflow_trigger_on_tags
-      - b_ubu18: *workflow_trigger_on_tags
       - t_ubu_cli: *workflow_ubuntu2004
       - t_ubu_soltest: *workflow_ubuntu2004
       - t_ubu_soltest_enforce_yul: *workflow_ubuntu2004

.github/workflows/buildpack-deps.yml

@@ -6,7 +6,6 @@ on:
     paths:
       - 'scripts/docker/buildpack-deps/Dockerfile.emscripten'
       - 'scripts/docker/buildpack-deps/Dockerfile.ubuntu1604.clang.ossfuzz'
-      - 'scripts/docker/buildpack-deps/Dockerfile.ubuntu1804'
       - 'scripts/docker/buildpack-deps/Dockerfile.ubuntu2004.clang'
       - 'scripts/docker/buildpack-deps/Dockerfile.ubuntu2004'
 
@@ -23,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        image_variant: [emscripten, ubuntu1604.clang.ossfuzz, ubuntu1804, ubuntu2004.clang, ubuntu2004]
+        image_variant: [emscripten, ubuntu1604.clang.ossfuzz, ubuntu2004.clang, ubuntu2004]
 
     steps:
       - uses: actions/checkout@v2

ReleaseChecklist.md

@@ -52,7 +52,7 @@
 ### PPA
  - [ ] Change ``scripts/release_ppa.sh`` to match your key's email and key id.
  - [ ] Run ``scripts/release_ppa.sh v$VERSION`` to create the PPA release (you need the relevant openssl key).
- - [ ] Wait for the ``~ethereum/ubuntu/ethereum-static`` PPA build to be finished and published for *all platforms*. SERIOUSLY: DO NOT PROCEED EARLIER!!! *After* the static builds are *published*, copy the static package to the ``~ethereum/ubuntu/ethereum`` PPA for the destination series ``Trusty`` and ``Xenial`` while selecting ``Copy existing binaries``.
+ - [ ] Wait for the ``~ethereum/ubuntu/ethereum-static`` PPA build to be finished and published for *all platforms*. SERIOUSLY: DO NOT PROCEED EARLIER!!! *After* the static builds are *published*, copy the static package to the ``~ethereum/ubuntu/ethereum`` PPA for the destination series ``Trusty``, ``Xenial`` and ``Bionic`` while selecting ``Copy existing binaries``.
 
 ### Documentation
  - [ ] Build the new version on https://readthedocs.org/projects/solidity/ (select `latest` at the bottom of the page and click `BUILD`)

scripts/deps-ppa/static_z3.sh

@@ -27,7 +27,7 @@ email=builds@ethereum.org
 packagename=libz3-static-dev
 version=4.8.9
 
-DISTRIBUTIONS="bionic focal groovy"
+DISTRIBUTIONS="focal groovy"
 
 for distribution in $DISTRIBUTIONS
 do

scripts/docker/buildpack-deps/Dockerfile.ubuntu1804

@@ -1,108 +0,0 @@
-# vim:syntax=dockerfile
-#------------------------------------------------------------------------------
-# Dockerfile for building and testing Solidity Compiler on CI
-# Target: Ubuntu 18.04 (Bionic Beaver)
-# URL: https://hub.docker.com/r/ethereum/solidity-buildpack-deps
-#
-# This file is part of solidity.
-#
-# solidity is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# solidity is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with solidity.  If not, see <http://www.gnu.org/licenses/>
-#
-# (c) 2016-2019 solidity contributors.
-#------------------------------------------------------------------------------
-FROM buildpack-deps:bionic AS base
-LABEL version="4"
-
-ARG DEBIAN_FRONTEND=noninteractive
-
-RUN set -ex; \
-	dist=$(grep DISTRIB_CODENAME /etc/lsb-release | cut -d= -f2); \
-	echo "deb http://ppa.launchpad.net/ethereum/cpp-build-deps/ubuntu $dist main" >> /etc/apt/sources.list ; \
-	apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1c52189c923f6ca9 ; \
-	apt-get update; \
-	apt-get install -qqy --no-install-recommends \
-		build-essential \
-		software-properties-common \
-		cmake ninja-build clang++-8 \
-		libboost-filesystem-dev libboost-test-dev libboost-system-dev \
-		libboost-program-options-dev \
-		libjsoncpp-dev \
-		llvm-8-dev libz3-static-dev \
-		; \
-	apt-get install -qy python-pip python-sphinx; \
-	update-alternatives --install /usr/bin/llvm-symbolizer llvm-symbolizer /usr/bin/llvm-symbolizer-8 1; \
-	pip install codecov; \
-	rm -rf /var/lib/apt/lists/*
-
-FROM base AS libraries
-
-# OSSFUZZ: libprotobuf-mutator
-RUN set -ex; \
-	git clone https://github.com/google/libprotobuf-mutator.git \
-	    /usr/src/libprotobuf-mutator; \
-	cd /usr/src/libprotobuf-mutator; \
-	git checkout d1fe8a7d8ae18f3d454f055eba5213c291986f21; \
-	mkdir build; \
-	cd build; \
-	cmake .. -GNinja -DLIB_PROTO_MUTATOR_DOWNLOAD_PROTOBUF=ON \
-        -DLIB_PROTO_MUTATOR_TESTING=OFF -DCMAKE_BUILD_TYPE=Release \
-        -DCMAKE_INSTALL_PREFIX="/usr"; \
-	ninja; \
-	cp -vpr external.protobuf/bin/* /usr/bin/; \
-	cp -vpr external.protobuf/include/* /usr/include/; \
-	cp -vpr external.protobuf/lib/* /usr/lib/; \
-	ninja install/strip; \
-	rm -rf /usr/src/libprotobuf-mutator
-
-# OSSFUZZ: libfuzzer
-RUN set -ex; \
-	cd /var/tmp; \
-	svn co https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer libfuzzer; \
-	mkdir -p build-libfuzzer; \
-	cd build-libfuzzer; \
-	clang++-8 -O1 -stdlib=libstdc++ -std=c++11 -O2 -fPIC -c ../libfuzzer/*.cpp -I../libfuzzer; \
-	ar r /usr/lib/libFuzzingEngine.a *.o; \
-	rm -rf /var/lib/libfuzzer
-
-# EVMONE
-ARG EVMONE_HASH="e9f8df89c52d9c60c9a38dd00687b1ec9e9ae9650b400a87c4c0cf7468e35307"
-ARG EVMONE_MAJOR="0"
-ARG EVMONE_MINOR="4"
-ARG EVMONE_MICRO="0"
-RUN set -ex; \
-	EVMONE_VERSION="$EVMONE_MAJOR.$EVMONE_MINOR.$EVMONE_MICRO"; \
-	TGZFILE="evmone-$EVMONE_VERSION-linux-x86_64.tar.gz"; \
-	wget https://github.com/ethereum/evmone/releases/download/v$EVMONE_VERSION/$TGZFILE; \
-	sha256sum $TGZFILE | grep ${EVMONE_HASH}; \
-	tar xzpf $TGZFILE -C /usr; \
-	rm -f $TGZFILE;
-
-# HERA
-ARG HERA_HASH="1a0b3cf626910c969f0ac86b7a731969a2e5b8254bc4e626b8f3a60471481f03"
-ARG HERA_MAJOR="0"
-ARG HERA_MINOR="3"
-ARG HERA_MICRO="2"
-RUN set -ex; \
-	HERA_VERSION="$HERA_MAJOR.$HERA_MINOR.$HERA_MICRO"; \
-	TGZFILE="hera-$HERA_VERSION-linux-x86_64.tar.gz"; \
-	wget https://github.com/ewasm/hera/releases/download/v$HERA_VERSION/$TGZFILE; \
-	sha256sum $TGZFILE | grep ${HERA_HASH}; \
-	tar xzpf $TGZFILE -C /usr; \
-	rm -f $TGZFILE;
-
-FROM base
-COPY --from=libraries /usr/lib /usr/lib
-COPY --from=libraries /usr/bin /usr/bin
-COPY --from=libraries /usr/include /usr/include
-

scripts/release_ppa.sh

@@ -57,7 +57,7 @@ packagename=solc
 
 static_build_distribution=focal
 
-DISTRIBUTIONS="bionic focal groovy"
+DISTRIBUTIONS="focal groovy"
 
 if is_release
 then