[PATCH] travis: Update to GCC 8

[Nir Soffer]

From: Nir Soffer <nsoffer(a)redhat.com&gt;

Travis latest Ubuntu images come with GCC 5.0.4, which fail to compile
with:

    cc: error: unrecognized command line option ‘-fstack-clash-protection’

Using GCC 8 from ubuntu-toolchain-r-test fixes this issue.

Signed-off-by: Nir Soffer <nsoffer(a)redhat.com&gt;
---
 .travis.yml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 675768d..8cc2859 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,23 @@
 dist: xenial
 language: python
 
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - gcc-8
+
 before_install:
     - sudo apt-get -qq update
     - sudo apt-get install -y make gcc libaio-dev libblkid-dev
 
+env:
+    - CC="gcc-8"
+
 script:
     - make -C wdmd
     - make -C src
     - make -C python inplace
     - source tests/env.sh
     - pytest
-- 
2.17.2