From c88fb1cc9f089aff4b9f640bdef43062f19fc071 Mon Sep 17 00:00:00 2001
From: chenguoping <chenguopingdota@163.com>
Date: Sat, 4 Jul 2020 17:42:33 +0800
Subject: [PATCH] add travis task : compile and test under C++17

---
 .travis.yml | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 0fef3f44b..b90757349 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -218,6 +218,17 @@ matrix:
         sources: ['ubuntu-toolchain-r-test']
         packages: ['g++-9', 'ninja-build']
 
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-9
+      - CXXFLAGS=-std=c++17
+      - CMAKE_CXX_STANDARD=17
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-9', 'ninja-build']
+
   # Linux / Clang
 
   - os: linux
@@ -323,7 +334,11 @@ script:
 
   # compile and execute unit tests
   - mkdir -p build && cd build
-  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release
+  - if [[ "${CMAKE_CXX_STANDARD}" != "" ]]; then
+    cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release ;
+    else
+    cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -DJSON_BuildTests=On -GNinja && cmake --build . --config Release ;
+    fi
   - ctest -C Release --timeout 2700 -V -j
   - cd ..