Drop direct support for Ubuntu 18.04 and switch to static PPA release…

…s 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 protected]
 packagename=libz3-static-dev
 version=4.8.9
 
-DISTRIBUTIONS="bionic focal groovy"
+DISTRIBUTIONS="focal groovy"
 
 for distribution in $DISTRIBUTIONS
 do

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