Add Travis CI file

.travis.yml

@@ -0,0 +1,23 @@
+language: cpp
+dist: xenial
+
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - python3-pip
+      - python3-setuptools
+      - ninja-build
+      - gcc-7
+
+install:
+  # The meson included in the Xenial repositories is too old (0.29).
+  - pip3 install meson
+  - export CC=gcc-7
+
+script:
+  - mkdir build
+  - meson build
+  - ninja -v -C build
+  - meson test -v -C build