Travis: add iOS build

Disable most warnings for iOS test build as otherwise the Travis log file will
exceed 4MB and the build will fail.

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

scripts/ios/before_install.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -x
+set -e
+
+# try to get rid of the insane debug crap
+unalias -a
+unset -f rvm_debug
+unset -f cd
+unset -f pushd
+unset -f popd
+
+# 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
+
+git submodule init
+git submodule update --recursive
+
+pushd libdivecomputer
+autoreconf --install
+autoreconf --install
+popd
+
+# prep things so we can build for iOS
+# we have a custom built Qt some gives us just what we need
+
+pushd ${TRAVIS_BUILD_DIR}/..
+
+echo "Get custom Qt build and unpack it"
+curl --output ./Qt5.10.1-iOS.tar.xz \
+                https://storage.googleapis.com/travis-cache/Qt5.10.1-iOS.tar.xz
+tar xJf Qt5.10.1-iOS.tar.xz
+
+# our scripts assume that there are two convenience links - arguably this
+# should be fixed in the scripts, but...
+ln -s Qt5.10.1 Qt
+cd subsurface/packaging/ios
+ln -s ${TRAVIS_BUILD_DIR}/../Qt Qt
+
+popd