Travis: add Qt 5.7 testing

This is done via Fedora 26 which seemed the easiest way to get a 5.7 based
distro.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

.travis.yml

@@ -125,6 +125,13 @@ matrix:
       services:
           - docker
 
+    - env: SUBSURFACE_PLATFORM="qt57"
+      os: linux
+      language: c++
+      filter_secrets: false
+      services:
+          - docker
+
 before_install:
     - source ${TRAVIS_BUILD_DIR}/scripts/${SUBSURFACE_PLATFORM}/before_install.sh
 

scripts/qt57/after_success.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+echo "Build with Qt 5.7 succeeded"

scripts/qt57/before_install.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Travis only pulls shallow repos. But that messes with git describe.
+# Sorry Travis, fetching the whole thing and the tags as well...
+git fetch --unshallow
+git pull --tags
+git describe
+
+# Ugly, but keeps it running during the build
+docker run -v $PWD:/workspace/subsurface --name=builder -w /workspace -d fedora:26 /bin/sleep 60m
+
+# Subsurface build dependencies
+docker exec -t builder zypper refresh
+docker exec -t builder dnf install -y \
+	git gcc-c++ make autoconf automake libtool cmake bzip2-devel \
+	libzip-devel libxml2-devel libxslt-devel libsqlite3x-devel \
+	libudev-devel libusbx-devel libcurl-devel libssh2-devel\
+	qt5-qtbase-devel qt5-qtdeclarative-devel qt5-qtscript-devel \
+	qt5-qtwebkit-devel qt5-qtsvg-devel qt5-qttools-devel \
+	qt5-qtconnectivity-devel qt5-qtlocation-devel

scripts/qt57/travisbuild.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -x
+set -e
+
+docker exec -t builder subsurface/scripts/build.sh -desktop 2>&1 | tee build.log
+# fail the build if we didn't create the target binary
+grep /workspace/install-root/bin/subsurface build.log
+