Add C++17 test to Travis

.travis.yml

@@ -148,6 +148,11 @@ jobs:
       env: >-
         FILE_ENV="./ci/test/00_setup_env_native_valgrind.sh"
 
+    - stage: test
+      name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no depends, only system libs, c++17]'
+      env: >-
+        FILE_ENV="./ci/test/00_setup_env_native_cxx17.sh"
+
     - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [focal]  [no depends, only system libs, sanitizers: fuzzer,address,undefined]'
       env: >-

ci/test/00_setup_env_native_cxx17.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+export CONTAINER_NAME=ci_native_cxx17
+export PACKAGES="python3-zmq libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev"
+export NO_DEPENDS=1
+export GOAL="install"
+export BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --enable-c++17"