cmake: fail build if valgrind tests are enabled and there's no valgrind

Author: lukaszstolarczuk

.github/workflows/gha.yml

@@ -150,6 +150,7 @@ jobs:
                     -DCMAKE_TOOLCHAIN_FILE="${env:CMAKE_TOOLCHAIN_FILE}"
                     -DCMAKE_INSTALL_PREFIX="${env:CMAKE_INSTALL_PREFIX}"
                     -DTESTS_USE_FORCED_PMEM=ON
+                    -DTESTS_USE_VALGRIND=OFF
                     -DTESTS_TBB=ON
                     -DDEVELOPER_MODE=ON
                     -DCXX_STANDARD="${{ matrix.CXX_STANDARD }}"

CMakeLists.txt

@@ -147,6 +147,10 @@ if(VALGRIND_FOUND)
 	if(VALGRIND_PMEMCHECK_FOUND)
 		add_flag(-DLIBPMEMOBJ_CPP_VG_PMEMCHECK_ENABLED=1)
 	endif()
+elseif(NOT VALGRIND_FOUND AND TESTS_USE_VALGRIND)
+	message(FATAL_ERROR "Valgrind not found, but flag TESTS_USE_VALGRIND was set.")
+elseif(NOT VALGRIND_FOUND)
+	message(WARNING "Valgrind not found. Valgrind tests will not be performed.")
 endif()
 
 # Find Clang