6 Release date: 2018-02-11
8 New features and enhancements
9 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 - The compiler option form `--sysroot arg` is now handled like the documented
14 - Added support for caching `.su` files generated by GCC flag `-fstack-usage`.
16 - ccache should now work with distcc's ``pump'' wrapper.
18 - The optional unifier is no longer disabled when the direct mode is enabled.
20 - Added support for nvcc compiler options `--compiler-bindir/-ccbin`,
21 `--output-directory/-odir` and `--libdevice-directory/-ldir`.
23 - Boolean environment variable settings no longer accept the following
24 (case-insensitive) values: `0`, `false`, `disable` and `no`. All other values
25 are accepted and taken to mean ``true''. This is to stop users from setting
26 e.g. `CCACHE_DISABLE=0` and then expect the cache to be used.
28 - Improved support for `run_second_cpp = false`: If combined with passing
29 `-fdirectives-only` (GCC) or `frewrite-includes` (Clang) to the compiler,
30 diagnostics warnings and similar will be correct.
32 - An implicit `-MQ` is now passed to the preprocessor only if the object file
33 extension is non-standard. This should make it easier to use EDG-based
34 compilers (e.g. GHS) which don't understand `-MQ`.
36 - ccache now treats an unreadable configuration file just like a missing
39 - Documented more pitfalls with enabling `hard_links` (`CCACHE_HARDLINK`).
41 - Documented caveats related to colored warnings from compilers.
47 - File size and number counters are now updated correctly when files are
48 overwritten in the cache, e.g. when using `CCACHE_RECACHE`.
50 - `run_second_cpp` is now forced for nvcc.
52 - Fixed how the nvcc options `-optf` and `-odir` are handled.
57 Release date: 2018-01-28
59 New features and enhancements
60 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
62 - Improved instructions on how to get cache hits between different working
69 - Fixed regression in ccache 3.3.5 related to the `UNCACHED_ERR_FD` feature.
74 Release date: 2018-01-13
77 New features and enhancements
78 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
80 - Documented how automatic cache cleanup works.
86 - Fixed a regression where the original order of debug options could be lost.
87 This reverts the ``Improved parsing of `-g*` options'' feature in ccache 3.3.
89 - Multiple `-fdebug-prefix-map` options should now be handled correctly.
91 - Fixed matching of directories in the `ignore_headers_in_manifest`
94 - Fixed detection of missing argument to `-opt`/`--options-file`.
96 - ccache now bails out when building a precompiled header if any of the
97 corresponding header files have an updated timestamp. This fixes complaints
100 - Fixed a bug related to erroneously storing a dependency file with absolute
101 paths in the cache on a preprocessed hit.
103 - `ccache -c/--cleanup` now works like documented: it just recalculates size
104 counters and trims the cache to not exceed the max size and file number
105 limits. Previously, the forced cleanup took ``limit_multiple'' into account,
106 so that `ccache -c/--cleanup` by default would trim the cache to 80% of the
109 - ccache no longer ignores linker arguments for clang since clang warns about
112 - Plugged a couple of file descriptor leaks.
114 - Fixed a bug where ccache would skip hashing the compiler argument following a
115 `-fno-working-directory`, `-fworking-directory`, `-nostdinc`, `-nostdinc++`,
116 `-remap` or `-trigraphs` option in preprocessor mode.
121 Release date: 2017-02-17
123 New features and enhancements
124 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
126 - Documented the different cache statistics counters.
132 - Fixed a regression in ccache 3.3 related to potentially bad content of
133 dependency files when compiling identical source code but with different
134 source paths. This was only partially fixed in 3.3.2 and reverts the new
135 ``Names of included files are no longer included in the hash of the
136 compiler's preprocessed output'' feature in 3.3.
138 - Corrected statistics counter for `-optf`/`--options-file` failure.
140 - Fixed undefined behavior warnings in ccache found by `-fsanitize=undefined`.
144 Release date: 2016-10-26
149 - ccache now detects usage of `.incbin` assembler directives in the source code
150 and avoids caching such compilations.
155 Release date: 2016-09-28
160 - Fixed a regression in ccache 3.3 related to potentially bad content of
161 dependency files when compiling identical source code but with different
164 - Fixed a regression in ccache 3.3.1: ccache could get confused when using the
165 compiler option `-Wp,` to pass multiple options to the preprocessor,
166 resulting in missing dependency files from direct mode cache hits.
171 Release date: 2016-09-07
176 - Fixed a problem in the ``multiple `-arch` options'' support introduced in
177 3.3. When using the direct mode (the default), different combinations of
178 `-arch` options were not detected properly.
180 - Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
181 path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
182 (`CCACHE_CPP2`) is enabled.
187 Release date: 2016-08-27
192 - A C99-compatible compiler is now required to build ccache.
195 New features and enhancements
196 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
198 - The configuration option `run_second_cpp` (`CCACHE_CPP2`) now defaults to
199 true. This improves ccache's out-of-the-box experience for compilers that
200 can't compile their own preprocessed output with the same outcome as if they
201 compiled the real source code directly, e.g. newer versions of GCC and Clang.
203 - The configuration option `hash_dir` (`CCACHE_HASHDIR`) now defaults to true.
205 - Added a new `ignore_headers_in_manifest` configuration option, which
206 specifies headers that should be ignored in the direct mode.
208 - Added a new `prefix_command_cpp` (`CCACHE_PREFIX_CPP`) configuration option,
209 which specifies one or several prefixes to add to the command line ccache
210 uses when invoking the preprocessor.
212 - Added a new `limit_multiple` (`CCACHE_LIMIT_MULTIPLE`) configuration option,
213 which specifies how much of the cache to remove when cleaning.
215 - Added a new `keep_comments_cpp` (`CCACHE_COMMENTS`) configuration option,
216 which tells ccache not to discard the comments before hashing preprocessor
217 output. This can be used to check documentation with *-Wdocumentation*.
219 - Added a new sloppiness option `no_system_headers`, which tells ccache not to
220 include system headers in manifest files.
222 - Added a new statistics counter that tracks the number of performed cleanups
223 due to the cache size being over the limit. The value is shown in the output
226 - Added support for relocating debug info directory using `-fdebug-prefix-map`.
227 This allows for cache hits even when `hash_dir` is used in combination with
230 - Added a new ``cache hit rate'' field to the output of ``ccache -s''.
232 - Added support for caching compilation of assembler code produced by e.g.
235 - Added support for cuda including the -optf/--options-file option.
237 - Added support for Fortran 77.
239 - Added support for multiple `-arch` options to produce "fat binaries".
241 - Multiple identical `-arch` arguments are now handled without bailing.
243 - The concatenated form of some long compiler options is now recognized, for
244 example when using `-isystemPATH` instead of `-isystem PATH`.
246 - If hard-linking is enabled and but fails (e.g. due to cross-device linking),
247 ccache now falls back to copying instead of running the compiler.
249 - Made the `hash_dir` option only have effect when generating debug info.
251 - ccache now knows how to convert absolute paths to relative paths inside
252 dependency files when using `base_dir`.
254 - Improved parsing of `-g*` options.
256 - Made ccache understand `-Wp,-D*` options.
258 - ccache now understands the undocumented `-coverage` (only one dash) GCC
261 - Names of included files are no longer included in the hash of the compiler's
262 preprocessed output. This leads to more potential cache hits when not using
265 - Increased buffer size used when reading file data. This improves performance
272 - Bail out on too hard compiler option `-P`.
274 - Fixed clang test suite when running on Linux.
276 - Fixed build and test for MinGW32 and Windows.
281 Release date: 2016-09-28
286 - Fixed a regression in ccache 3.2.8: ccache could get confused when using the
287 compiler option `-Wp,` to pass multiple options to the preprocessor,
288 resulting in missing dependency files from direct mode cache hits.
293 Release date: 2016-09-07
298 - Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
299 path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
300 (`CCACHE_CPP2`) is enabled.
302 - ccache now understands the undocumented `-coverage` (only one dash) GCC
308 Release date: 2016-07-20
313 - Fixed a bug which could lead to false cache hits for compiler command lines
314 with a missing argument to an option that takes an argument.
316 - ccache now knows how to work around a glitch in the output of GCC 6's
322 Release date: 2016-07-12
327 - Fixed build problem on QNX, which lacks ``SA_RESTART''.
329 - Bail out on compiler option `-fstack-usage` since it creates a `.su` file
330 which ccache currently doesn't handle.
332 - Fixed a bug where (due to ccache rewriting paths) the compiler could choose
333 incorrect include files if `CCACHE_BASEDIR` is used and the source file path
334 is absolute and is a symlink.
339 Release date: 2016-04-17
342 New features and enhancements
343 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
345 - Only pass clang-specific `-stdlib=` to the preprocessor.
347 - Improved handling of stale NFS handles.
349 - Made it harder to misinterpret documentation of boolean environment settings'
356 - Include m4 files used by configure.ac in the source dist archives.
358 - Corrected "Performance" section in the manual regarding `__DATE_`, `__TIME__`
359 and `__FILE__` macros.
361 - Fixed build on Solaris 10+ and AIX 7.
363 - Fixed failure to create directories on QNX.
365 - Don't (try to) update manifest file in ``read-only'' and ``read-only direct''
368 - Fixed a bug in caching of `stat` system calls in ``file_stat_matches
371 - Fixed bug in hashing of clang plugins, leading to unnecessary cache misses.
373 - Fixed --print-config to show ``pch_defines sloppiness''.
375 - The man page is now built when running ``make install'' from Git repository
381 Release date: 2015-10-08
387 - Fixed build error related to zlib on systems with older make versions
388 (regression in ccache 3.2.3).
390 - Made conversion-to-bool explicit to avoid build warnings (and potential
391 runtime errors) on legacy systems.
393 - Improved signal handling: Kill compiler on SIGTERM; wait for compiler to exit
394 before exiting; die appropriately.
396 - Minor fixes related to Windows support.
398 - The correct compression level is now used if compression is requested.
400 - Fixed a bug where cache cleanup could be run too early for caches larger than
401 64 GiB on 32-bit systems.
406 Release date: 2015-08-16
409 New features and enhancements
410 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
412 - Added support for compiler option `-gsplit-dwarf`.
418 - Support external zlib in nonstandard directory.
420 - Avoid calling `exit()` inside an exit handler.
422 - Let exit handler terminate properly.
424 - Bail out on compiler option `--save-temps` in addition to `-save-temps`.
426 - Only log "Disabling direct mode" once when failing to read potential include
432 Release date: 2015-05-10
435 New features and enhancements
436 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
438 - Added support for `CCACHE_COMPILERCHECK=string:<value>`. This is a faster
439 alternative to `CCACHE_COMPILERCHECK=<command>` if the command's output can
440 be precalculated by the build system.
442 - Add support for caching code coverage results (compiling for gcov).
448 - Made hash of cached result created with and without `CCACHE_CPP2` different.
449 This makes it possible to rebuild with `CCACHE_CPP2` set without having to
450 clear the cache to get new results.
452 - Don't try to reset a non-existing stats file. This avoids ``No such file or
453 directory'' messages in the ccache log when the cache directory doesn't
456 - Fixed a bug where ccache deleted clang diagnostics after compiler failures.
458 - Avoid performing an unnecessary copy of the object file on a cache miss.
460 - Bail out on too hard compiler option `-fmodules`.
462 - Bail out on too hard compiler option `-fplugin=libcc1plugin` (interaction
465 - Fixed build error when compiling ccache with recent clang versions.
467 - Removed signal-unsafe code from signal handler.
469 - Corrected logic for when to output cached stderr.
471 - Wipe the whole cached result on failure retrieving a cached file.
473 - Fixed build error when compiling ccache with recent clang versions.
478 Release date: 2014-12-10
484 - Fixed regression in temporary file handling, which lead to incorrect
485 permissions for stats, manifest and ccache.conf files in the cache.
487 - `CACHEDIR.TAG` files are now created in the [0-9a-f] subdirectories so that
488 ccache.conf is not lost in backups.
490 - Made the default cache size suffix `G`, as previously documented.
492 - `-fdiagnostics-color=auto` is now passed to the compiler even if stderr is
493 redirected. This fixes a problem when, for instance, a configure test probes
494 if the compiler (wrapped via ccache) supports `-fdiagnostics-color=auto`.
496 - Added missing documentation for `max_files` and `max_size` configuration
502 Release date: 2014-11-17
505 New features and enhancements
506 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
508 - Added support for configuring ccache via one or several configuration files
509 instead of via environment variables. Environment variables still have
510 priority but are no longer the recommended way of customizing ccache
511 behavior. See the manual for more information.
513 - Added support for compiler error/warning messages with color.
515 - Made creation of temporary directories and cache directories smarter to avoid
516 unnecessary `stat` calls.
518 - Improved efficiency of the algorithm that scans for `__DATE_` and `__TIME__`
519 tokens in the hashed source code.
521 - Added support for several binaries (separated by space) in `CCACHE_PREFIX`.
523 - The `-c` option is no longer passed to the preprocessor. This fixes problems
524 with clang and Solaris's C++ compiler.
526 - ccache no longer passes preprocessor options like `-D` and `-I` to the
527 compiler when compiling preprocessed output. This fixes warnings emitted by
530 - Compiler options `-fprofile-generate`, `-fprofile-arcs`, `-fprofile-use` and
531 `-fbranch-probabilities` are now handled without bailing.
533 - Added support for clang's `--serialize-diagnostic` option, storing the
534 diagnostic file (`.dia`) in the cache.
536 - Added support for precompiled headers when using clang.
538 - Added support for clang `.pth` (pretokenized header) files.
540 - Changed the `-x` language option to use the new objective C standard for GCC
543 - On a cache miss, ccache now instructs the compiler to create the object file
544 at the real destination and then copies the file into the cache instead of
545 the other way around. This is needed to support compiler options like
546 `-fprofile-arcs` and `--serialize-diagnostics`.
548 - ccache now checks that included files' ctimes aren't too new. This check can
549 be turned off by adding `include_file_ctime` to the ``ccache sloppiness''
552 - Added possibility to get cache hits based on filename, size, mtime and ctime
553 only. On other words, source code files are not even read, only stat-ed. This
554 operation mode is opt-in by adding `file_stat_matches` to the ``ccache
555 sloppiness'' setting.
557 - The filename part of options like `-Wp,-MDfilename` is no longer included in
558 the hash since the filename doesn't have any bearing on the result.
560 - Added a ``read-only direct'' configuration setting, which is like the
561 ordinary read-only setting except that ccache will only try to retrieve
562 results from the cache using the direct mode, not the preprocessor mode.
564 - The display and interpretation of cache size has been changed to use SI
567 - Default cache size is now 5 GB (was previously 1 GiB).
569 - Added configuration option to set the compression level of compressed object
572 - Added support for `@file` and `-@file` arguments (reading options from a
575 - `-Wl,` options are no longer included in the hash since they don't affect
578 - Bail out on too hard compiler option `-Wp,-P`.
580 - Optimized MD4 calculation code on little-endian systems.
582 - Various improvements and fixes on win32.
584 - Improved logging to the ccache log file.
586 - Added `--dump-manifest` command-line option for debugging purposes.
588 - Added `--with-bundled-zlib` configure option.
590 - Upgraded bundled zlib to version 1.2.8.
592 - Improved `dev.mk` to be more platform independent.
594 - Made the test suite work with clang and gcc-llvm on OS X.
596 - Various other improvements of the test suite.
602 - Any previous `.stderr` is now removed from the cache when recaching.
604 - Fixed an issue when handling the `-arch` compiler option with an argument.
606 - Fixed race condition when creating the initial cache directory.
608 - Fixed test suite failures when `CC` is a ccache-wrapped compiler.
613 Release date: 2016-07-12
619 - Fixed a bug where (due to ccache rewriting paths) the compiler could choose
620 incorrect include files if `CCACHE_BASEDIR` is used and the source file path
621 is absolute and is a symlink.
626 Release date: 2015-03-07
632 - Fixed bug which could result in false cache hits when source code contains
633 `'"'` followed by `" /*"` or `" //"` (with variations).
635 - Made hash of cached result created with and without `CCACHE_CPP2` different.
636 This makes it possible to rebuild with `CCACHE_CPP2` set without having to
637 clear the cache to get new results.
639 - Don't try to reset a non-existing stats file. This avoids ``No such file or
640 directory'' messages in the ccache log when the cache directory doesn't
646 Release date: 2014-10-19
649 New features and enhancements
650 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
652 - Added support for the `-Xclang` compiler option.
654 - Improved handling of exit code of internally executed processes.
656 - Zero length object files in the cache are now rejected as invalid.
658 - Bail out on option `-gsplit-dwarf` (since it produces multiple output files).
660 - Compiler option `-fdebug-prefix-map` is now ignored (not part of the hash).
661 (The `-fdebug-prefix-map` option may be used in combination with
662 `CCACHE_BASEDIR` to reuse results across different directories.)
664 - Added note in documentation that `--ccache-skip` currently does not mean
665 ``don't hash the following option''.
667 - To enable support for precompiled headers (PCH), `CCACHE_SLOPPINESS` now also
668 needs to include the new `pch_defines` sloppiness. This is because ccache
669 can't detect changes in the source code when only defined macros have been
672 - Stale files in the internal temporary directory (`<ccache_dir>/tmp`) are now
673 cleaned up if they are older than one hour.
679 - Fixed path canonicalization in `make_relative_path()` when path doesn't
682 - Fixed bug in `common_dir_prefix_length()`. This corrects the `CCACHE_BASEDIR`
685 - ccache no longer tries to create the cache directory when `CCACHE_DISABLE` is
688 - Fixed bug when reading manifests with a very large number of file info
691 - Fixed problem with logging of current working directory.
696 Release date: 2013-01-06
702 - The EAGAIN signal is now handled correctly when emitting cached stderr
703 output. This fixes a problem triggered by large error outputs from the
706 - Subdirectories in the cache are no longer created in read-only mode.
708 - Fixed so that ccache's log file descriptor is not made available to the
711 - Improved error reporting when failing to create temporary stdout/stderr files
712 when executing the compiler.
714 - Disappearing temporary stdout/stderr files are now handled gracefully.
720 - Fixed test suite to work on ecryptfs.
725 Release date: 2012-08-11
728 New features and enhancements
729 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
731 - Made paths to dependency files relative in order to increase cache hits.
733 - Added work-around to make ccache work with buggy GCC 4.1 when creating a
736 - Clang plugins are now hashed to catch plugin upgrades.
742 - Fixed crash when the current working directory has been removed.
744 - Fixed crash when stderr is closed.
746 - Corrected a corner case when parsing backslash escapes in string
749 - Paths are now correctly canonicalized when computing paths relative to the
756 - Made git version macro work when compiling outside of the source directory.
758 - Fixed `static_assert` macro definition clash with GCC 4.7.
763 Release date: 2012-01-08
769 - Non-writable `CCACHE_DIR` is now handled gracefully when `CCACHE_READONLY` is
772 - Made failure to create files (typically due to bad directory permissions) in
773 the cache directory fatal. Previously, such failures were silently and
774 erroneously flagged as "compiler produced stdout".
776 - Both the `-specs=file` and `--specs=file` forms are now recognized.
778 - Added recognition and hashing of GCC plugins specified with `-fplugin=file`.
780 - `CCACHE_COMPILERCHECK` now also determines how to hash explicit specs files
783 - Added `CPATH`, `C_INCLUDE_PATH` and similar environment variables to the hash
784 to avoid false cache hits when such variables have changed.
786 - Corrected log message when unify mode is enabled.
788 - Reverted the GCC bug compatibility introduced in ccache 3.1.5 for `-MT`/`-MQ`
789 options with concatenated arguments. (The bug is fixed in recent GCC
796 - Corrected license header for `mdfour.c`.
798 - Improved documentation on how to fix bad object files in the cache.
804 Release date: 2011-08-21
807 New features and enhancements
808 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
810 - Rewrite argument to `--sysroot` if `CCACHE_BASEDIR` is used.
816 - Don't crash if `getcwd()` fails.
818 - Fixed alignment of ``called for preprocessing'' counter.
823 Release date: 2011-05-29
826 New features and enhancements
827 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
829 - Added a new statistics counter named ``called for preprocessing''.
831 - The original command line is now logged to the file specified with
834 - Improved error logging when system calls fail.
836 - Added support for rewriting absolute paths in `-F`/`-iframework` GCC
839 - Improved order of statistics counters in `ccache -s` output.
845 - The `-MF`/`-MT`/`-MQ` options with concatenated argument are now handled
846 correctly when they are last on the command line.
848 - ccache is now bug compatible with GCC for the `-MT`/`-MQ` options with
849 concatenated arguments.
851 - Fixed a minor memory leak.
853 - Systems that lack (and don't need to be linked with) libm are now supported.
858 Release date: 2011-01-09
864 - Made a work-around for a bug in `gzputc()` in zlib 1.2.5.
866 - Corrupt manifest files are now removed so that they won't block direct mode
869 - ccache now copes with file systems that don't know about symbolic links.
871 - The file handle in now correctly closed on write error when trying to create
877 Release date: 2010-11-28
883 - The -MFarg, -MTarg and -MQarg compiler options (i.e, without space between
884 option and argument) are now handled correctly.
890 - Portability fixes for HP-UX 11.00 and other esoteric systems.
895 Release date: 2010-11-21
901 - Bail out on too hard compiler options `-fdump-*`.
903 - NULL return values from malloc/calloc of zero bytes are now handled
906 - Fixed issue when parsing precompiler output on AIX.
912 - Improved documentation on which information is included in the hash sum.
914 - Made the ``too new header file'' test case work on file systems with
915 unsynchronized clocks.
917 - The test suite now also works on systems that lack a /dev/zero.
922 Release date: 2010-11-07
928 - ccache now falls back to preprocessor mode when a non-regular include file
929 (device, socket, etc) has been detected so that potential hanging due to
930 blocking reads is avoided.
932 - CRC errors are now detected when decompressing compressed files in the cache.
934 - Fixed potential object file corruption race on NFS.
936 - Minor documentation corrections.
938 - Fixed configure detection of ar.
940 - ccache development version (set by dev.mk) now works with gits whose
941 `describe` command doesn't understand `--dirty`.
947 - Minor debug log message improvements.
952 Release date: 2010-09-16
955 New features and enhancements
956 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
958 - Added support for hashing the output of a custom command (e.g. `%compiler%
959 --version`) to identify the compiler instead of stat-ing or hashing the
960 compiler binary. This can improve robustness when the compiler (as seen by
961 ccache) actually isn't the real compiler but another compiler wrapper.
963 - Added support for caching compilations that use precompiled headers. (See the
964 manual for important instructions regarding this.)
966 - Locking of the files containing statistics counters is now done using
967 symlinks instead of POSIX locks. This should make ccache behave a lot better
968 on file systems where POSIX locks are slow or broken (e.g. NFS on some
971 - Manifest files are now updated without the need of taking locks.
973 - Updates of statistics counters are now always done in one of the sub-level
974 statistics files. This reduces lock contention, which especially improves
975 performance on slow NFS mounts.
977 - Reading and writing of statistics counters has been made forward-compatible
978 (unknown counters are retained).
980 - Files are now read without using `mmap()`. This has two benefits: it's more
981 robust against file changes during reading and it improves performance on
982 poor systems where `mmap()` doesn't use the disk cache.
984 - Added `.cp` and `.CP` as known C++ suffixes.
988 - Added `-install_name` as an option known to take an argument. (This improves
989 statistics when using the Darwin linker.)
995 - Non-fatal error messages are now never printed to stderr but logged instead.
997 - Fixed a bug affecting failing commands when `--ccache-skip` is used.
999 - Made `--ccache-skip` work for all options.
1001 - EINTR is now handled correctly.
1007 - Work on porting ccache to win32 (native), mostly done by Ramiro Polla. The
1008 port is not yet finished, but will hopefully be complete in some subsequent
1011 - Added a `--nostats` flag to the performance benchmark program.
1013 - Made the performance benchmark program more accurate when measuring cache
1016 - Added a new test framework for unit tests written in C.
1018 - Got rid of `configure-dev`; dev mode is now given by `dev.mk.in` presence.
1020 - Improved documentation on how to combine ccache with other compiler wrappers
1023 - New `LICENSE.txt` file with licensing and copyright details about bundled
1026 - New `AUTHORS.txt` file with a list of ccache contributors.
1028 - New `HACKING.txt` file with some notes about ccache code conventions.
1033 Release date: 2010-07-15
1039 - The statistics counter ``called for link'' is now correctly updated when
1040 linking with a single object file.
1042 - Fixed a problem with out-of-source builds.
1047 Release date: 2010-06-20
1053 - ccache is now licensed under the GNU General Public License (GPL) version 3
1060 - The way the hashes are calculated has changed, so you won't get cache hits
1061 for compilation results stored by older ccache versions. Because of this, you
1062 might as well clear the old cache directory with `ccache --clear` if you
1063 want, unless you plan to keep using an older ccache version.
1066 New features and enhancements
1067 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1069 - ccache now has a ``direct mode'' where it computes a hash of the source code
1070 (including all included files) and compiler options without running the
1071 preprocessor. By not running the preprocessor, CPU usage is reduced; the
1072 speed is somewhere between 1 and 5 times that of ccache running in
1073 traditional mode, depending on the circumstances. The speedup will be higher
1074 when I/O is fast (e.g., when files are in the disk cache). The direct mode
1075 can be disabled by setting +CCACHE_NODIRECT+.
1077 - Support has been added for rewriting absolute paths to relative paths when
1078 hashing, in order to increase cache hit rate when building the same source
1079 code in different directories even when compiling with `-g` and when using
1080 absolute include directory paths. This is done by setting the
1081 `CCACHE_BASEDIR` environment variable to an absolute path that specifies
1082 which paths to rewrite.
1084 - Object files are now optionally stored compressed in the cache. The runtime
1085 cost is negligible, and more files will fit in the ccache directory and in
1086 the disk cache. Set `CCACHE_COMPRESS` to enable object file compression. Note
1087 that you can't use compression in combination with the hard link feature.
1089 - A `CCACHE_COMPILERCHECK` option has been added. This option tells ccache what
1090 compiler-identifying information to hash to ensure that results retrieved
1091 from the cache are accurate. Possible values are: none (don't hash anything),
1092 mtime (hash the compiler's mtime and size) and content (hash the content of
1093 the compiler binary). The default is mtime.
1095 - It is now possible to specify extra files whose contents should be included
1096 in the hash sum by setting the `CCACHE_EXTRAFILES` option.
1098 - Added support for Objective-C and Objective-C\+\+. The statistics counter
1099 ``not a C/C++ file'' has been renamed to ``unsupported source language''.
1101 - Added support for the `-x` compiler option.
1103 - Added support for long command-line options.
1105 - A `CACHEDIR.TAG` file is now created in the cache directory. See
1106 <http://www.brynosaurus.com/cachedir/>.
1108 - Messages printed to the debug log (specified by `CCACHE_LOGFILE`) have been
1111 - You can relax some checks that ccache does in direct mode by setting
1112 `CCACHE_SLOPPINESS`. See the manual for more information.
1114 - `CCACHE_TEMPDIR` no longer needs to be on the same filesystem as
1117 - The default value of `CCACHE_TEMPDIR` has been changed to `$CCACHE_DIR/tmp`
1118 to avoid cluttering the top directory.
1120 - Temporary files that later will be moved into the cache are now created in
1121 the cache directory they will end up in. This makes ccache more friendly to
1122 Linux's directory layout.
1124 - Improved the test suite and added tests for most of the new functionality.
1125 It's now also possible to specify a subset of tests to run.
1127 - Standard error output from the compiler is now only stored in the cache if
1130 - If the compiler produces no object file or an empty object file, but gives a
1131 zero exit status (could be due to a file system problem, a buggy program
1132 specified by `CCACHE_PREFIX`, etc.), ccache copes with it properly.
1134 - Added `installcheck` and `distcheck` make targets.
1136 - Clarified cache size limit options' and cleanup semantics.
1138 - Improved display of cache max size values.
1140 - The following options are no longer hashed in the preprocessor mode:
1141 `-imacros`, `-imultilib`, `-iprefix`, `-iquote`, `-isysroot`, `-iwithprefix`,
1142 `-iwithprefixbefore`, `-nostdinc`, `-nostdinc++` and `-U`.
1148 - Various portability improvements.
1150 - Improved detection of home directory.
1152 - User-defined `CPPFLAGS` and `LDFLAGS` are now respected in the Makefile.
1156 - Computation of the hash sum has been improved to decrease the risk of hash
1157 collisions. For instance, the compiler options `-X -Y` and `-X-Y` previously
1158 contributed equally to the hash sum.
1160 - Bail out on too hard compiler options `--coverage`, `-fprofile-arcs`,
1161 `-fprofile-generate`, `-fprofile-use`, `-frepo`, `-ftest-coverage` and
1162 `-save-temps`. Also bail out on `@file` style options.
1164 - Errors when using multiple `-arch` compiler options are now noted as
1165 ``unsupported compiler option''.
1167 - `-MD`/`-MMD` options without `-MT`/`-MF` are now handled correctly.
1169 - The `-finput-charset` option is now handled correctly.
1171 - Added support for `-Wp,-MD` and `-Wp,-MMD` options.
1173 - The compiler options `-Xassembler`, `-b`, `-G` and `-V` are now correctly
1174 recognized as taking an argument.
1176 - Debug information containing line numbers of predefined and command-line
1177 macros (enabled with the compiler option `-g3`) will now be correct.
1179 - Corrected LRU cleanup handling of object files.
1181 - `utimes()` is now used instead of `utime()` when available.
1183 - Non-writable cache directories are now handled gracefully.
1185 - Corrected documentation about sharing the cache directory.
1187 - Fixed compilation warnings from GCC 4.3.
1189 - The command specified by `CCACHE_PREFIX` is no longer part of the hash.
1191 - Fixed bad memory access spotted by Valgrind.
1193 - Fixed a bug in `x_realloc`.
1195 - Freed memory is no longer referenced when compiling a `.i`/`.ii` file and
1196 falling back to running the real compiler.
1198 - The test suite is now immune to external values of the `CCACHE_*` environment
1201 - Improved detection of recursive invocation.
1203 - The ccache binary is now not unconditionally stripped when installing.
1205 - Statistics counters are now correctly updated for -E option failures and
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