#2474: cmake: try a different solution due to cmake version not supporting policy

Author: lifflander

ci/build_cpp.sh

@@ -172,7 +172,7 @@ cmake -G "${CMAKE_GENERATOR:-Ninja}" \
       -Dvt_tests_num_nodes="${VT_TESTS_NUM_NODES:-}" \
       -Dvt_external_fmt="${VT_EXTERNAL_FMT:-0}" \
       -Dfmt_DIR="${FMT_DIR}" \
-      -DLIBUNWIND_ROOT="${LIBUNWIND_ROOT:-/usr}" \
+      -DLIBUNWIND_ROOT="${libunwind_ROOT:-/usr}" \
       -Dvt_no_color_enabled="${VT_NO_COLOR_ENABLED:-0}" \
       -DCMAKE_CXX_STANDARD="${CMAKE_CXX_STANDARD:-17}" \
       -DBUILD_SHARED_LIBS="${BUILD_SHARED_LIBS:-0}" \

cmake/load_libunwind.cmake

@@ -1,17 +1,11 @@
 set(vt_feature_cmake_libunwind "0")
 
-cmake_policy(PUSH)
-
-cmake_policy(SET CMP0144 NEW)
-
-if(NOT DEFINED LIBUNWIND_ROOT)
-    set(LIBUNWIND_ROOT "/usr")
+if(NOT DEFINED libunwind_ROOT)
+    set(libunwind_ROOT "/usr")
 endif()
 
 find_package(libunwind)
 
-cmake_policy(POP)
-
-if(LIBUNWIND_FOUND)
+if(libunwind_FOUND)
     set(vt_feature_cmake_libunwind "1")
 endif()