From a4eaaa56d14fd529fe7a05703f2c7c45b1dc5f68 Mon Sep 17 00:00:00 2001
From: Thomas Braun <thomas.braun@byte-physics.de>
Date: Mon, 26 Aug 2019 10:40:13 +0200
Subject: [PATCH] .travis.yml: Add gcc 9 and compile with experimental C++20
 support

---
 .travis.yml | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 484c9350..7078fd09 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -204,13 +204,21 @@ matrix:
 
   - os: linux
     compiler: gcc
-    env:
-      - COMPILER=g++-8
-      - CXXFLAGS=-std=c++17
+    env: COMPILER=g++-9
     addons:
       apt:
         sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-8', 'ninja-build']
+        packages: ['g++-9', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-9
+      - CXXFLAGS=-std=c++2a
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-9', 'ninja-build']
 
   # Linux / Clang