Use install.sh to install modern CMake on TravisCI

Author: zbeekman

.travis.yml

@@ -13,6 +13,7 @@ env:
     - MPICH_GCC7_BOT_URL_HEAD="https://github.com/sourceryinstitute/OpenCoarrays/files/1956441/"
     - MPICH_BOT_URL_TAIL="mpich-3.2.1_1.high_sierra.bottle.1.tar.gz"
     - BUILD_TYPES="Debug RelWithDebInfo Release CodeCoverage"
+    - PATH="${HOME}/.local/bin:$PATH"
   # matrix:
   #   - GCC="6 7" OSX_PACKAGES="gcc@7 gcc@6 cmake shellcheck" BUILD_TYPE="cmake"
 

developer-scripts/travis/install.linux.sh

@@ -21,6 +21,10 @@ trap '__caf_err_report "${FUNCNAME:-.}" ${LINENO}' ERR
 
 echo "Performing Travis-CI installation phase on Linux..."
 
+echo "Installing CMake binaries using install.sh..."
+
+./install.sh --package=cmake --install-prefix="${HOME}/.local"
+
 if [[ "${BUILD_TYPE:-}" != InstallScript ]]; then # Ubuntu on Travis-CI, NOT testing install.sh
     if ! [[ -x "${HOME}/.local/bin/mpif90" && -x "${HOME}/.local/bin/mpicc" ]]; then
         # mpich install not cached