Merge pull request #5911 from ethereum/cxx17-circleci

Build using C++17 on CircleCI

.circleci/config.yml

@@ -66,6 +66,7 @@ jobs:
           paths:
             - soljson.js
             - version.txt
+
   test_emscripten_solcjs:
     docker:
       - image: circleci/node:10
@@ -84,6 +85,7 @@ jobs:
           name: Test solcjs
           command: |
             test/solcjsTests.sh /tmp/workspace/soljson.js $(cat /tmp/workspace/version.txt)
+
   test_emscripten_external:
     docker:
       - image: circleci/node:10
@@ -102,6 +104,7 @@ jobs:
           name: External tests
           command: |
             test/externalTests.sh /tmp/workspace/soljson.js || test/externalTests.sh /tmp/workspace/soljson.js
+
   build_x86_linux:
     docker:
       - image: buildpack-deps:bionic
@@ -124,6 +127,23 @@ jobs:
           paths:
             - "*"
 
+  build_x86_linux_cxx17:
+    docker:
+      - image: buildpack-deps:disco
+    environment:
+      TERM: xterm
+      CMAKE_OPTIONS: -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/cxx17.cmake
+    steps:
+      - checkout
+      - run:
+          name: Install build dependencies
+          command: |
+            apt-get -qq update
+            apt-get -qy install cmake libboost-regex-dev libboost-filesystem-dev libboost-test-dev libboost-system-dev libboost-program-options-dev libcvc4-dev
+            ./scripts/install_obsolete_jsoncpp_1_7_4.sh
+      - run: *setup_prerelease_commit_hash
+      - run: *run_build
+
   build_x86_archlinux:
     docker:
       - image: archlinux/base
@@ -345,6 +365,7 @@ workflows:
           requires:
             - build_emscripten
       - build_x86_linux: *build_on_tags
+      - build_x86_linux_cxx17: *build_on_tags
       - build_x86_clang7: *build_on_tags
       - build_x86_mac: *build_on_tags
       - test_x86_linux:

cmake/toolchains/cxx17.cmake

@@ -0,0 +1,4 @@
+# Require C++17.
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
+set(CMAKE_CXX_EXTENSIONS OFF)