CI: install latest CMake

.travis.yml

@@ -19,10 +19,8 @@ cache:
   directories: build/llvm
 
 
-before_install:
-  - cmake --version
-
 script:
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then scripts/install_cmake.sh; fi
   - scripts/build.sh
   - cd build && ctest
   - cd ..

circle.yml

@@ -1,9 +1,7 @@
 dependencies:
-  pre:
-    - sudo apt-add-repository -y ppa:george-edison55/cmake-3.x
-    - sudo apt -q update
-    - sudo apt -qy install cmake
   override:
+    - scripts/install_cmake.sh
+    - export PATH=~/.local/bin:$PATH
     - BUILD_TYPE=RelWithDebInfo scripts/build.sh
   cache_directories:
     # TODO: add ccache

scripts/install_cmake.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env sh
+
+# This script downloads the CMake binary and installs it in ~/.local directory
+# (the cmake executable will be in ~/.local/bin).
+# This is mostly suitable for CIs, not end users.
+
+set -e
+
+VERSION=3.7.1
+PREFIX=~/.local
+
+OS=$(uname -s)
+case $OS in
+Linux)  SHA256=7b4b7a1d9f314f45722899c0521c261e4bfab4a6b532609e37fef391da6bade2;;
+Darwin) SHA256=1851d1448964893fdc5a8c05863326119f397a3790e0c84c40b83499c7960267;;
+esac
+
+
+BIN=$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-$OS-x86_64.tar.gz
+    URL=https://cmake.org/files/v3.7/$FILE
+    ERROR=0
+    TMPFILE=$(mktemp --tmpdir cmake-$VERSION-$OS-x86_64.XXXXXXXX.tar.gz)
+    echo "Downloading CMake ($URL)..."
+    wget "$URL" -O "$TMPFILE" -nv
+    if ! (shasum -a256 "$TMPFILE" | grep -q "$SHA256"); then
+        echo "Checksum mismatch ($TMPFILE)"
+        exit 1
+    fi
+    mkdir -p "$PREFIX"
+    tar xzf "$TMPFILE" -C "$PREFIX" --strip 1
+    rm $TMPFILE
+fi