CI: assert cmake version in run-build.sh for C++20 build

Author: igchor

utils/docker/prepare-for-build.sh

@@ -90,3 +90,12 @@ if [ "${CI_RUN}" == "YES" ]; then
 	sudo_password chmod 0777 ${TEST_DIR}
 	sudo_password mount -o size=2G -t tmpfs none ${TEST_DIR}
 fi || true
+
+echo "CMake version:"
+cmake --version
+
+# assign CMake's version to variable(s)  - a single number representation for easier comparison
+CMAKE_VERSION=$(cmake --version | head -n1 | grep -P -o "\d+\.\d+")
+CMAKE_VERSION_MAJOR=$(echo ${CMAKE_VERSION} | cut -d. -f1)
+CMAKE_VERSION_MINOR=$(echo ${CMAKE_VERSION} | cut -d. -f2)
+CMAKE_VERSION_NUMBER=${CMAKE_VERSION_MAJOR}${CMAKE_VERSION_MINOR}

utils/docker/run-build.sh

@@ -214,6 +214,11 @@ function tests_gcc_release_cpp17_no_valgrind() {
 function tests_clang_release_cpp20_no_valgrind() {
 	printf "\n$(tput setaf 1)$(tput setab 7)BUILD ${FUNCNAME[0]} START$(tput sgr 0)\n"
 
+	if [ ${CMAKE_VERSION_NUMBER} -lt 312 ]; then
+		echo "ERROR: C++20 is supported in CMake since 3.12, installed version: ${CMAKE_VERSION}"
+		exit 1
+	fi
+
 	mkdir build && cd build
 
 	PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:/opt/pmdk/lib/pkgconfig/ \