1<!-- 2Copyright (C) Internet Systems Consortium, Inc. ("ISC") 3 4SPDX-License-Identifier: MPL-2.0 5 6This Source Code Form is subject to the terms of the Mozilla Public 7License, v. 2.0. If a copy of the MPL was not distributed with this 8file, you can obtain one at https://mozilla.org/MPL/2.0/. 9 10See the COPYRIGHT file distributed with this work for additional 11information regarding copyright ownership. 12--> 13Setting the `CPPFLAGS` environment variable before running `configure` 14can be used to enable certain compile-time options that are not 15explicitly defined in `configure`. 16 17Some of these settings are: 18 19| Setting | Description | 20| ---------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- | 21| `-DCHECK_LOCAL=0` | Don't check out-of-zone addresses in `named-checkzone` | 22| `-DCHECK_SIBLING=0` | Don't check sibling glue in `named-checkzone` | 23| `-DISC_FACILITY=LOG_LOCAL0` | Change the default syslog facility for `named` | 24| `-DISC_HEAP_CHECK` | Test heap consistency after every heap operation; used when debugging | 25| `-DISC_MEM_DEFAULTFILL=1` | Overwrite memory with tag values when allocating or freeing it; this impairs performance but makes debugging of memory problems easier | 26| `-DISC_MEM_TRACKLINES=0` | Don't track memory allocations by file and line number; this improves performance but makes debugging more difficult | 27| `-DNAMED_RUN_PID_DIR=0` | Create default PID files in `${localstatedir}/run` rather than `${localstatedir}/run/named/` | 28| `-DNS_CLIENT_DROPPORT=0` | Disable dropping queries from particular well-known ports | 29| `-DOPENSSL_API_COMPAT=10100` | Build using the deprecated OpenSSL APIs so that the `engine` API is available when building with OpenSSL 3.0.0 for PKCS#11 support | 30