From b4ea71a8b2943b1f937450f6b6a3e1af99ecaad4 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim.demaille@gmail.com>
Date: Sun, 9 Sep 2018 20:04:28 +0200
Subject: [PATCH] CI: use clang with libc++

GCC uses libstdc++.  Let's also check libc++.

* .travis.yml: here.
---
 .travis.yml | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index debb3f0b..22e0c342 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -76,7 +76,7 @@ matrix:
           packages:
             - clang-5.0
       env:
-        - MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0 && CPPFLAGS=-DNDEBUG && CFLAGS=-O3 && CXXFLAGS=-O3"
+        - MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0 && CPPFLAGS=-DNDEBUG && CFLAGS=-O3 && CXXFLAGS=-O3 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -86,7 +86,7 @@ matrix:
           packages:
             - clang-5.0
       env:
-        - MATRIX_EVAL="CC='clang-5.0 -fsanitize=address' && CXX='clang++-5.0 -fsanitize=address'"
+        - MATRIX_EVAL="CC='clang-5.0 -fsanitize=address' && CXX='clang++-5.0 -fsanitize=address' && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -96,7 +96,7 @@ matrix:
           packages:
             - clang-4.0
       env:
-        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"
+        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -106,7 +106,7 @@ matrix:
           packages:
             - clang-3.9
       env:
-        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"
+        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -117,7 +117,7 @@ matrix:
           packages:
             - clang-3.8
       env:
-        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
+        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -128,7 +128,7 @@ matrix:
           packages:
             - clang-3.7
       env:
-        - MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7"
+        - MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -139,7 +139,7 @@ matrix:
           packages:
             - clang-3.6
       env:
-        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"
+        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -150,7 +150,7 @@ matrix:
           packages:
             - clang-3.5
       env:
-        - MATRIX_EVAL="CC=clang-3.5 && CXX=clang++-3.5"
+        - MATRIX_EVAL="CC=clang-3.5 && CXX=clang++-3.5 && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -159,7 +159,7 @@ matrix:
             - clang-3.4
       env:
         # No versioned name installed.
-        - MATRIX_EVAL="CC=clang && CXX=clang++"
+        - MATRIX_EVAL="CC=clang && CXX=clang++ && CXXFLAGS=-stdlib=libc++"
 
     - os: linux
       addons:
@@ -168,7 +168,7 @@ matrix:
             - clang-3.3
       env:
         # No versioned name installed.
-        - MATRIX_EVAL="CC=clang && CXX=clang++"
+        - MATRIX_EVAL="CC=clang && CXX=clang++ && CXXFLAGS=-stdlib=libc++"
 
 before_install:
   - sudo apt-get update -qq