Travis CI: Use CMake 3.8.1

.travis.yml

@@ -16,6 +16,7 @@ cache:
         - $HOME/.hunter/_Base/Cache
 before_install:
     - if [[ "$CUDA" = ON ]]; then source scripts/install-cuda-trusty.sh; fi
+    - if [ "$TRAVIS_OS_NAME" = linux ]; then scripts/install_cmake.sh; fi
 script:
     - cmake -DHUNTER_JOBS_NUMBER=4 -DETHASHCUDA=$CUDA -DETHASHCL=ON -H. -Bbuild
     - cmake --build build

scripts/install_cmake.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env sh
+
+# This script downloads the CMake binary and installs it in $PREFIX directory
+# (the cmake executable will be in $PREFIX/bin). By default $PREFIX is
+# ~/.local but can we changes with --prefix <PREFIX> argument.
+
+# This is mostly suitable for CIs, not end users.
+
+set -e
+
+VERSION=3.8.1
+
+if [ "$1" = "--prefix" ]; then
+    PREFIX="$2"
+else
+    PREFIX=~/.local
+fi
+
+OS=$(uname -s)
+case $OS in
+Linux)  SHA256=10ca0e25b7159a03da0c1ec627e686562dc2a40aad5985fd2088eb684b08e491;;
+Darwin) SHA256=cf8cf16eb1281127006507e69bbcfabec2ccbbc3dfb95888c39d578d037569f1;;
+esac
+
+
+BIN=$PREFIX/bin
+
+if test -f $BIN/cmake && ($BIN/cmake --version | grep -q "$VERSION"); then
+    echo "CMake $VERSION already installed in $BIN"
+else
+    FILE=cmake-$VERSION-$OS-x86_64.tar.gz
+    VERSION_SERIES=$(echo $VERSION | awk '{ string=substr($0, 1, 3); print string; }')
+    URL=https://cmake.org/files/v$VERSION_SERIES/$FILE
+    ERROR=0
+    TMPFILE=$(mktemp --tmpdir cmake-$VERSION-$OS-x86_64.XXXXXXXX.tar.gz)
+    echo "Downloading CMake ($URL)..."
+    curl -s "$URL" > "$TMPFILE"
+
+    if type -p sha256sum > /dev/null; then
+        SHASUM_TOOL="sha256sum"
+    else
+        SHASUM_TOOL="shasum -a256"
+    fi
+
+    SHASUM=$($SHASUM_TOOL "$TMPFILE")
+    if ! (echo "$SHASUM" | grep -q "$SHA256"); then
+        echo "Checksum mismatch!"
+        echo "Actual:   $SHASUM"
+        echo "Expected: $SHA256"
+        exit 1
+    fi
+    mkdir -p "$PREFIX"
+    tar xzf "$TMPFILE" -C "$PREFIX" --strip 1
+    rm $TMPFILE
+fi