ASAN: only suppress report on specific memory leaks

CMakeLists.txt

@@ -171,9 +171,13 @@ four_c_process_cache_variable(
 set(_mpiexec_all_args_for_testing ${FOUR_C_MPIEXEC_ARGS_FOR_TESTING})
 
 if(FOUR_C_ENABLE_ADDRESS_SANITIZER)
+  set(_suppressions_file ${PROJECT_BINARY_DIR}/tests/asan_leak_suppressions.txt)
+  configure_file(tests/asan_leak_suppressions.txt ${_suppressions_file} COPYONLY)
   # Do not detect leaks, we only care about UB inducing memory issues
-  string(APPEND _mpiexec_all_args_for_testing " -x LSAN_OPTIONS=detect_leaks=0")
-  set(FOUR_C_ENABLE_ADDRESS_SANITIZER_TEST_OPTIONS "LSAN_OPTIONS=detect_leaks=0")
+  string(APPEND _mpiexec_all_args_for_testing " -x LSAN_OPTIONS=suppressions=${_suppressions_file}")
+  set(FOUR_C_ENABLE_ADDRESS_SANITIZER_TEST_OPTIONS
+      "LSAN_OPTIONS=suppressions=${_suppressions_file}"
+      )
 endif()
 
 set(FOUR_C_EXECUTABLE_NAME 4C)

tests/asan_leak_suppressions.txt

@@ -0,0 +1,26 @@
+# Known memory leaks to suppress for AddressSanitizer leak detection
+
+###
+# Leaks from other libraries (not our fault)
+###
+
+# MPI
+# Note: this list was done for OpenMPI which we use in CI
+leak:MPI_Init
+leak:libevent
+leak:event_base_loop
+# MPI_Finalize does not necessarily show up in the stack trace, but this destructor does
+leak:~CleanUpMPI
+
+# CLN
+# leak:base/cl_malloc.cc
+
+# Catch all remaining leaks from other libraries
+# A more specific suppression would be better, but the originating function or lib names are not symbolized.
+# At least it is better to only ignore leaks coming from strdup, than ignoring all leaks.
+leak:strdup
+
+
+###
+# Leaks from our code that we have chosen to ignore (including link to respective GitHub issue or reason)
+###