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Daniel Sahlberg
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25 дек 2025, 16:55
25 дек 2025, 16:55
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0 Content ========= 1 Introduction 2 Condensed list of defines and environment variables 3 Defines tweaking SVN defaults 4 Defines enabling or disabling features 5 Defines controlling debug support 6 Defines that affect unit tests 7 Environment variables 1 Introduction ============== This is a document intended for use by Subversion developers only. In particular, interface naming rules do not apply here. I.e. even SVN_* identifiers are not part of the public API unless declared as public in some public header file. The SVN source code boasts a number of environment variable or C pre- processor enabled tweaks that are mainly aimed at developer support. If you introduce new ones, please document them here. Macros documented in the configure-generated ../subversion/svn_private_config.h file are not repeated here. 2 Defines and Environment Variables =================================== 2.1 Defaults DEFAULT_FS_TYPE DEFAULT_HTTP_LIBRARY MAX_SECS_TO_LINGER SUFFIX_LINES_TO_KEEP SVN_FS_FS_DEFAULT_MAX_FILES_PER_DIR SVN_FS_FS_MAX_LINEAR_DELTIFICATION SVN_FS_FS_MAX_DELTIFICATION_WALK SVN_UNALIGNED_ACCESS_IS_OK (deprecated) 2.2 Features CHECK_FOR_SAME_FILE SVN_DIFF3_HAS_DIFF_PROGRAM_ARG SVN_DISABLE_ENTRY_CACHE SVN_MERGE__ALLOW_ALL_FORWARD_MERGES_FROM_SELF SVN_USE_WIN32_CRASHHANDLER SVN_DAV_SEND_VTXN_NAME SVN_DISABLE_PREFIX_SUFFIX_SCANNING SVN_FS_FS_DELTIFY_DIRECTORIES SVN_FS_FS_DELTIFY_PROPS SVN_SQLITE_MIN_VERSION_NUMBER SVN_SQLITE_MIN_VERSION SVN_SERF_NO_LOGGING SVN_ALLOW_SHORT_INTS SVN_ALLOW_NON_8_BIT_CHARS SVNXX_USE_BOOST 2.3 Debugging Support SVN_DBG_QUIET SVN_DEBUG SVN_CLIENT_COMMIT_DEBUG SVN_DEBUG_CACHE_DUMP_STATS SVN_DEBUG_CACHE_MEMBUFFER SVN_DEBUG_DSO SVN_DEBUG_WORK_QUEUE PACK_AFTER_EVERY_COMMIT [removed] DEBUG_DOUBLE_FREE SERF_VERBOSE SSL_VERBOSE SVN_DEPRECATED SVN_FS__TRAIL_DEBUG SVN_FS_FS__LOG_ACCESS SVN_FS_EMULATE_PATHS_CHANGED SVN_FS_EMULATE_REPORT_CHANGES SVNXX_POOL_DEBUG 2.4 Test-only QUOPRINT_SVNDIFFS SVN_ENABLE_DEPRECATION_WARNINGS_IN_TESTS TEST16K_ADD 2.5 Environment Variables SVNSYNC_UNSUPPORTED_STRIP_MERGEINFO SVNSYNC_UNSUPPORTED_MIGRATE_SVNMERGE SVN_CMDLINE_DISABLE_CRASH_HANDLER SVN_I_LOVE_CORRUPTED_WORKING_COPIES_SO_DISABLE_RELOCATE_VALIDATION SVN_I_LOVE_CORRUPTED_WORKING_COPIES_SO_DISABLE_SLEEP_FOR_TIMESTAMPS SVN_I_LOVE_PANGALACTIC_GARGLE_BLASTERS SVN_I_LIKE_LATENCY_SO_IGNORE_HTTPV2 3 Defines tweaking SVN defaults =============================== 3.1 DEFAULT_FS_TYPE Scope: (global) Purpose: selects the default FS type to be used for a new repository if no type is provided Range: strings "fsfs", "bdb" Default: "fsfs" Suggested: "fsfs" 3.2 DEFAULT_HTTP_LIBRARY Scope: (global) Purpose: selects the default http library to be used for accessing remote repositories using http/https protocol Range: strings "serf", "neon" Default: "serf" Suggested: "serf" 3.3 MAX_SECS_TO_LINGER Scope: svn protocol Purpose: Range: Default: 30 Suggested: 3.4 SUFFIX_LINES_TO_KEEP Scope: libsvn_diff Purpose: control the identical prefix / identical suffix diff(blame) optimizations. Range: natural integers Default: 50 Suggested: 0, 1, 999999 3.5 SVN_FS_FS_DEFAULT_MAX_FILES_PER_DIR Scope: libsvn_fs_fs Purpose: set fsfs default shard size Default: 1000 Range: natural integers Suggested: 1, 2, 3, 4, 5, 7, 11 3.6 SVN_FS_FS_MAX_LINEAR_DELTIFICATION Scope: libsvn_fs_fs Purpose: Controls the space efficiency vs. reconstruction costs tradeoff of rep deltification. Defines the max length of the linear deltification history before skip-deltification kicks in. Values < 2 result in skip-delta-only behavior. Default: 16 Range: natural integers; should be a power of 2 Suggested: 1, 4, 8, 16, 32, 64 3.7 SVN_FS_FS_MAX_DELTIFICATION_WALK Scope: libsvn_fs_fs Purpose: Limits the skip deltification range to provide commit runtime guarantees. Change histories longer than that will be restarted with a fulltext. Values < 1 disable deltification. Default: 1023 Range: natural integers; should be a power of 2 minus one Suggested: 0, 63, 1023, 4095, 16383 3.8 SVN_UNALIGNED_ACCESS_IS_OK DEPRECATED, unused. The rest of this entry is historical. Scope: (global) Purpose: enable data accesss optimizations. If your target CPU supports unaligned memory access without significant performance penalties, you should enable this optimization as it allows for processing 4 or 8 bytes at once instead of just one byte at a time. Range: 0 1 Default: platform dependant (see svn_types.h) Suggested: 0 4 Defines enabling or disabling features ======================================== 4.1 CHECK_FOR_SAME_FILE Scope: libsvn_subr (file copy) Purpose: Test whether we try to do no-op file copies. If defined, svn_io_copy_file() will return an error when source and destination are the same file. Range: definedness Default: not defined Suggested: not defined 4.2 SVN_DIFF3_HAS_DIFF_PROGRAM_ARG Scope: libsvn_subr Purpose: Range: definedness Default: not defined Suggested: defined, not defined 4.3 SVN_DISABLE_ENTRY_CACHE Scope: libsvn_wc Purpose: If defined, ADM entries will not be cached. Range: definedness Default: not defined Suggested: defined, not defined 4.4 SVN_MERGE__ALLOW_ALL_FORWARD_MERGES_FROM_SELF Scope: libsvn_client Purpose: Range: definedness Default: not defined Suggested: not defined 4.5 SVN_USE_WIN32_CRASHHANDLER Scope: libsvn_subr Purpose: Define this in the Win32 platform if you want to enable the crash handler allowing for post-mortem analysis after fatal application failures. Range: definedness Default: defined (Windows only), not defined (elsewhere) Suggested: defined (Windows only), not defined 4.6 SVN_DAV_SEND_VTXN_NAME Scope: libsvn_ra_serf, libsvn_ra_neon Purpose: Testing VTXN name for v2 commits. Defining this causes the client to send a VTXN name header. Range: definedness Default: not defined Suggested: defined, not defined 4.7 SVN_DISABLE_PREFIX_SUFFIX_SCANNING Scope: libsvn_diff Purpose: Define this symbol to disable the prefix/suffix scanning of the diff processing, letting all lines be handled by the full-fledged diff algorithm (with LCS algorithm). This define can be useful for focusing on testing the LCS algorithm, or for comparing diff performance with and without prefix/suffix scanning. Range: definedness Default: not defined Suggested: not defined 4.8 SVN_FS_FS_DELTIFY_DIRECTORIES Scope: libsvn_fs_fs Purpose: Define this symbol to enable directory deltification in FSFS. When activated, previous versions of Subversion will still be able to read from and write to this repository. Range: definedness Default: not defined Suggested: defined 4.9 SVN_FS_FS_DELTIFY_PROPS Scope: libsvn_fs_fs Purpose: Define this symbol to enable node property deltification in FSFS. When activated, previous versions of Subversion will still be able to read from and write to this repository. Range: definedness Default: not defined Suggested: not defined 4.10 SVN_SQLITE_MIN_VERSION_NUMBER Scope: libsvn_subr Purpose: The minimum SQLite version to have run-time support for. Range: SQLite version numbers, as packed integers Default: SQLITE_VERSION_NUMBER (i.e., the compile-time-sqlite version) Suggested: not defined (to use default) 4.11 SVN_SQLITE_MIN_VERSION Scope: libsvn_subr Purpose: See SVN_SQLITE_MIN_VERSION_NUMBER. The two must be overridden (or not overridden) together; defining one but leaving the other at its default will cause undefined behaviour. Range: SQLite versions, as string literals Default: SQLITE_VERSION Suggested: not defined (to use default) 4.11 SVN_ALLOW_SHORT_INTS Scope: global Purpose: Disables the size check for the 'int' type. We assume ints to be large enough (32 bits) to index various container objects. 16 ints will break that assumption. Defining this option will allow SVN to be compiled even if the size check would fail for some reason. Range: definedness Default: not defined Suggested: not defined (to ensure correct behaviour) 4.12 SVN_ALLOW_NON_8_BIT_CHARS Scope: global Purpose: Disables the size check for the 'char' type. We assume char has exactly 8 bits. Other values may break the code reading, interpreting and writing repository files. Defining this option will allow SVN to be compiled even if the size check would fail for some reason. Range: definedness Default: not defined Suggested: not defined (to ensure correct behaviour) 4.13 SVNXX_USE_BOOST Scope: SVN++ (subversion/bindings/cxx) Purpose: Adds header-only conversions and overloads to make SVN++ interoperate cleanly with selected Boost types. Defining this symbol does *not* affect the SVN++ ABI. Users may define the symbol when using SVN++ after libsvnxx has been built. Range: definedness Default: not defined Suggested: defined for testing SVN++, otherwise not defined 5 Defines controlling debug support ================================== 5.1 SVN_DBG_QUIET Scope: (global) Purpose: Reduce noise created by SVN_DBG() statements. Defining this symbol in the source file, before including svn_debug.h, will switch off the debug output issued by SVN_DBG. Calls will still be made to svn_dbg__preamble() for breakpoints. Range: definedness Default: not defined Suggested: defined, not defined 5.2 SVN_DEBUG Scope: (global) Purpose: Enables various, debug-mode-only checks and other development code. Never define this in release builds. Range: definedness Default: not defined Suggested: defined, not defined 5.3 SVN_CLIENT_COMMIT_DEBUG Scope: libsvn_client Purpose: Enables detailed client-side SVN_DBG output during commits. Range: definedness (if defined, SVN_DEBUG must be defined as well) Default: not defined Suggested: defined, not defined 5.4 SVN_DEBUG_CACHE_DUMP_STATS Scope: FSFS Purpose: Monitor FSFS object cache effectiveness. If defined, FSFS sessions will dump caching statistics to stdout just before the end of that session. Range: definedness Default: not defined Suggested: defined, not defined 5.5 SVN_DEBUG_CACHE_MEMBUFFER Scope: membuffer_cache Purpose: Detecting logic issues like key collisions etc. within the membuffer_cache. If you define this macro, the getter functions of the membuffer_cache will performed expensive checks on the cached items, requested keys and entry types. If any mismatch is detected, therespective getter will return an error. Range: definedness Default: not defined Suggested: defined, not defined 5.6 SVN_DEBUG_DSO Scope: libsvn_subr (dso) Purpose: detection of failures of dynamic loading of libraries Range: definedness Default: not defined Suggested: defined, not defined 5.7 SVN_DEBUG_WORK_QUEUE Scope: libsvn_wc (workqueue) Purpose: protocol workqueue operations via SVN_DBG Range: definedness Default: not defined Suggested: defined, not defined 5.8 PACK_AFTER_EVERY_COMMIT [removed] *** REMOVED in r1602871 (1.9-dev) *** Scope: libsvn_fs (only affects libsvn_fs_fs) Purpose: stress test Range: definedness Default: not defined Suggested: defined, not defined 5.9 DEBUG_DOUBLE_FREE Scope: serf Purpose: detect double-free calls to serf_bucket_mem_free() Range: definedness Default: defined Suggested: defined, not defined 5.10 SERF_VERBOSE Scope: serf Purpose: write protocol handling debug information to stdout Range: definedness Default: not defined Suggested: defined, not defined 5.11 SSL_VERBOSE Scope: serf Purpose: write SSL bucket handling debug information to stdout Range: definedness Default: not defined Suggested: defined, not defined 5.12 SVN_DEPRECATED Scope: (everywhere) Purpose: disable "deprecated function calls" warnings Range: function declaration decorator Default: (compiler dependant) Suggested: "" (disable deprecation warnings), or compiler-specific decorators 5.13 SVN_FS__TRAIL_DEBUG Scope: libsvn_fs_base Purpose: Range: definedness Default: not defined Suggested: defined, not defined 5.14 SVN_FS_FS__LOG_ACCESS Scope: libsvn_fs_fs/cached_data.c Purpose: logs type and location info for any fsfs data access above the cache layer to console (i.e. what data gets requested from FSFS rather than disk) Range: definedness Default: not defined Suggested: defined, not defined 5.15 SVN_FS_EMULATE_PATHS_CHANGED Scope: libsvn_fs/fs-loader.c Purpose: Force svn_fs_paths_changed2 to be emulated through svn_fs_paths_changed3 even if the FS provides an implementation of the former. Range: TRUE, FALSE Default: TRUE (local default if macro has not been defined) Suggested: FALSE 5.16 SVN_FS_EMULATE_REPORT_CHANGES Scope: libsvn_fs/fs-loader.c Purpose: Force svn_fs_paths_changed3 to be emulated through svn_fs_paths_changed2 even if the FS provides an implementation of the former. Range: TRUE, FALSE Default: TRUE (local default if macro has not been defined) Suggested: FALSE 5.17 SVNXX_POOL_DEBUG Scope: SVN++ (subversion/bindings/cxx) Purpose: Logs debugging info about the lifetime of the SVN++ global pool. Depends on SVN_DEBUG being defined. Range: definedness Default: not defined Suggested: defined, not defined 6 Defines that affect unit tests ================================ 6.1 QUOPRINT_SVNDIFFS Scope: svndiff-test Purpose: Range: definedness Default: not defined Suggested: defined, not defined 6.2 SVN_ENABLE_DEPRECATION_WARNINGS_IN_TESTS Scope: (all tests) Purpose: Range: definedness Default: not defined Suggested: defined, not defined 6.3 TEST16K_ADD Scope: client-test Purpose: If defined, an expensive test will be activated that adds 16384 files in single folder and commits that. This is used to detect performance abnormalies. Typical runtimes are 20 to 200 seconds. Range: definedness Default: not defined Suggested: defined, not defined 7 Environment variables: ======================== 7.1 SVNSYNC_UNSUPPORTED_STRIP_MERGEINFO Scope: Purpose: 7.2 SVNSYNC_UNSUPPORTED_MIGRATE_SVNMERGE Scope: Purpose: 7.3. SVN_CMDLINE_DISABLE_CRASH_HANDLER Scope: All command line executables. Windows specific. Purpose: Setting any value disables internal Subversion crash handler for creating minidump and stack trace information on failure on Windows. 7.4 SVN_I_LOVE_CORRUPTED_WORKING_COPIES_SO_DISABLE_RELOCATE_VALIDATION Scope: Purpose: 7.5 SVN_I_LOVE_CORRUPTED_WORKING_COPIES_SO_DISABLE_SLEEP_FOR_TIMESTAMPS Scope: Purpose: 7.6 SVN_I_LOVE_PANGALACTIC_GARGLE_BLASTERS Scope: svn commit Purpose: Set to 1 and commit revision 42 to any repository. Behold the output. 7.7 SVN_I_LIKE_LATENCY_SO_IGNORE_HTTPV2 Scope: libsvn_ra_neon and libsvn_ra_serf, if SVN_DEBUG Purpose: A "yes" value causes the RA modules to ignore the server's advertisement of HTTPv2 protocol support (if any), effectively causing them to only speak our original HTTP protocol. 7.8 SVN_SVNMUCC_IS_SVNSYITF Scope: 'make install-tools' Purpose: Symlinks $prefix/bin/svnsyitf to $prefix/bin/svnmucc 7.9 SVN_X_DOES_NOT_MARK_THE_SPOT Scope: svn_cache__t subsystem (used by FSFS, svnserve, etc) Purpose: Disable the subsystem. Requires -D SVN_DEBUG. * (TODO: others)