6 Release date: 2019-01-02
11 - Added missing getopt_long.c source file to release archive.
13 - Fixed (harmless) compiler warnings when building ccache object files.
15 - CFLAGS is no longer passed to the linker when linking ccache.
17 - Improved development mode build flags.
22 Release date: 2018-10-15
27 - Added a boolean `debug` (`CCACHE_DEBUG`) configuration option. When enabled,
28 ccache will create per-object debug files that are helpful e.g. when
29 debugging unexpected cache misses. See also the new ``Cache debugging''
30 section in the manual.
32 - Renamed `CCACHE_CC` to `CCACHE_COMPILER` (keeping the former as a deprecated
35 - Added a new command-line option `-k/--get-config` that prints the value of a
38 - It is now possible to let ccache hash a precomputed checksum file instead of
39 the full content of a precompiled header. This can save time for large
40 precompiled headers. Note that the build system needs to keep the checksum
41 file in sync with the precompiled header for this to work.
43 - Improved performance substantially when using `hash_dir = false` on platforms
44 like macOS where `getcwd()` is slow.
46 - Added ``stats updated'' timestamp in `ccache -s` output. This can be useful
47 if you wonder whether ccache actually was used for your last build.
49 - Renamed ``stats zero time'' to ``stats zeroed'' and documented it. The
50 counter is also now only present in `ccache -s` output when `ccache -z`
51 actually has been called.
53 - The content of the `-fsanitize-blacklist` file is now included in the hash,
54 so updates to the file will now correctly result in separate cache entries.
56 - It's now possible to opt out of building and installing man pages when
57 running `make install` in the source repository.
59 - If the compiler type can't be detected (e.g. if it is named *cc*), use safer
60 defaults that won't trip up Clang.
62 - Made the ccache test suite work on FreeBSD.
64 - Added `file_stat_matches_ctime` option to disable ctime check if
65 `file_stat_matches` is enabled.
67 - Made “./configure --without-bundled-zlib” do what’s intended.
72 Release date: 2018-09-02
77 - Fixed a race condition when creating the initial config file in the cache
80 - Bail out on too hard Clang option `-MJ`.
82 - Bail out on too hard option `-save-temps=obj`.
84 - Handle separate parameter to Clang option `-target` correctly.
86 - Upgraded bundled zlib to version 1.2.11.
91 Release date: 2018-03-25
96 - The cleanup algorithm has been fixed to not misbehave when files are removed
97 by another process while the cleanup process is running. Previously, too many
98 files could be removed from the cache if multiple cleanup processes were
99 triggered at the same time, in extreme cases trimming the cache to a much
100 smaller size than the configured limits.
102 - Correctly hash preprocessed headers located in a ``.gch directory''.
103 Previously, ccache would not pick up changes to such precompiled headers,
104 risking false positive cache hits.
106 - Fixed build failure when using the bundled zlib sources.
108 - ccache 3.3.5 added a workaround for not triggering Clang errors when a
109 precompiled header's dependency has an updated timestamp (but identical
110 content). That workaround is now only applied when the compiler is Clang.
112 - Made it possible to perform out-of-source builds in dev mode again.
117 Release date: 2018-02-11
122 - Fixed printing of version number in `ccache --version`.
127 Release date: 2018-02-11
129 New features and enhancements
130 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
132 - The compiler option form `--sysroot arg` is now handled like the documented
133 `--sysroot=arg` form.
135 - Added support for caching `.su` files generated by GCC flag `-fstack-usage`.
137 - ccache should now work with distcc's ``pump'' wrapper.
139 - The optional unifier is no longer disabled when the direct mode is enabled.
141 - Added support for NVCC compiler options `--compiler-bindir/-ccbin`,
142 `--output-directory/-odir` and `--libdevice-directory/-ldir`.
144 - Boolean environment variable settings no longer accept the following
145 (case-insensitive) values: `0`, `false`, `disable` and `no`. All other values
146 are accepted and taken to mean ``true''. This is to stop users from setting
147 e.g. `CCACHE_DISABLE=0` and then expect the cache to be used.
149 - Improved support for `run_second_cpp = false`: If combined with passing
150 `-fdirectives-only` (GCC) or `frewrite-includes` (Clang) to the compiler,
151 diagnostics warnings and similar will be correct.
153 - An implicit `-MQ` is now passed to the preprocessor only if the object file
154 extension is non-standard. This should make it easier to use EDG-based
155 compilers (e.g. GHS) which don't understand `-MQ`.
157 - ccache now treats an unreadable configuration file just like a missing
160 - Documented more pitfalls with enabling `hard_links` (`CCACHE_HARDLINK`).
162 - Documented caveats related to colored warnings from compilers.
168 - File size and number counters are now updated correctly when files are
169 overwritten in the cache, e.g. when using `CCACHE_RECACHE`.
171 - `run_second_cpp` is now forced for NVCC.
173 - Fixed how the NVCC options `-optf` and `-odir` are handled.
178 Release date: 2018-01-28
180 New features and enhancements
181 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
183 - Improved instructions on how to get cache hits between different working
190 - Fixed regression in ccache 3.3.5 related to the `UNCACHED_ERR_FD` feature.
195 Release date: 2018-01-13
198 New features and enhancements
199 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
201 - Documented how automatic cache cleanup works.
207 - Fixed a regression where the original order of debug options could be lost.
208 This reverts the ``Improved parsing of `-g*` options'' feature in ccache 3.3.
210 - Multiple `-fdebug-prefix-map` options should now be handled correctly.
212 - Fixed matching of directories in the `ignore_headers_in_manifest`
213 configuration option.
215 - Fixed detection of missing argument to `-opt`/`--options-file`.
217 - ccache now bails out when building a precompiled header if any of the
218 corresponding header files has an updated timestamp. This fixes complaints
221 - Fixed a bug related to erroneously storing a dependency file with absolute
222 paths in the cache on a preprocessed hit.
224 - `ccache -c/--cleanup` now works like documented: it just recalculates size
225 counters and trims the cache to not exceed the max size and file number
226 limits. Previously, the forced cleanup took ``limit_multiple'' into account,
227 so that `ccache -c/--cleanup` by default would trim the cache to 80% of the
230 - ccache no longer ignores linker arguments for Clang since Clang warns about
233 - Plugged a couple of file descriptor leaks.
235 - Fixed a bug where ccache would skip hashing the compiler argument following a
236 `-fno-working-directory`, `-fworking-directory`, `-nostdinc`, `-nostdinc++`,
237 `-remap` or `-trigraphs` option in preprocessor mode.
242 Release date: 2017-02-17
244 New features and enhancements
245 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
247 - Documented the different cache statistics counters.
253 - Fixed a regression in ccache 3.3 related to potentially bad content of
254 dependency files when compiling identical source code but with different
255 source paths. This was only partially fixed in 3.3.2 and reverts the new
256 ``Names of included files are no longer included in the hash of the
257 compiler's preprocessed output'' feature in 3.3.
259 - Corrected statistics counter for `-optf`/`--options-file` failure.
261 - Fixed undefined behavior warnings in ccache found by `-fsanitize=undefined`.
265 Release date: 2016-10-26
270 - ccache now detects usage of `.incbin` assembler directives in the source code
271 and avoids caching such compilations.
276 Release date: 2016-09-28
281 - Fixed a regression in ccache 3.3 related to potentially bad content of
282 dependency files when compiling identical source code but with different
285 - Fixed a regression in ccache 3.3.1: ccache could get confused when using the
286 compiler option `-Wp,` to pass multiple options to the preprocessor,
287 resulting in missing dependency files from direct mode cache hits.
292 Release date: 2016-09-07
297 - Fixed a problem in the ``multiple `-arch` options'' support introduced in
298 3.3. When using the direct mode (the default), different combinations of
299 `-arch` options were not detected properly.
301 - Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
302 path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
303 (`CCACHE_CPP2`) is enabled.
308 Release date: 2016-08-27
313 - A C99-compatible compiler is now required to build ccache.
316 New features and enhancements
317 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
319 - The configuration option `run_second_cpp` (`CCACHE_CPP2`) now defaults to
320 true. This improves ccache's out-of-the-box experience for compilers that
321 can't compile their own preprocessed output with the same outcome as if they
322 compiled the real source code directly, e.g. newer versions of GCC and Clang.
324 - The configuration option `hash_dir` (`CCACHE_HASHDIR`) now defaults to true.
326 - Added a new `ignore_headers_in_manifest` configuration option, which
327 specifies headers that should be ignored in the direct mode.
329 - Added a new `prefix_command_cpp` (`CCACHE_PREFIX_CPP`) configuration option,
330 which specifies one or several prefixes to add to the command line ccache
331 uses when invoking the preprocessor.
333 - Added a new `limit_multiple` (`CCACHE_LIMIT_MULTIPLE`) configuration option,
334 which specifies how much of the cache to remove when cleaning.
336 - Added a new `keep_comments_cpp` (`CCACHE_COMMENTS`) configuration option,
337 which tells ccache not to discard the comments before hashing preprocessor
338 output. This can be used to check documentation with *-Wdocumentation*.
340 - Added a new sloppiness option `no_system_headers`, which tells ccache not to
341 include system headers in manifest files.
343 - Added a new statistics counter that tracks the number of performed cleanups
344 due to the cache size being over the limit. The value is shown in the output
347 - Added support for relocating debug info directory using `-fdebug-prefix-map`.
348 This allows for cache hits even when `hash_dir` is used in combination with
351 - Added a new ``cache hit rate'' field to the output of ``ccache -s''.
353 - Added support for caching compilation of assembler code produced by e.g.
356 - Added support for cuda including the -optf/--options-file option.
358 - Added support for Fortran 77.
360 - Added support for multiple `-arch` options to produce "fat binaries".
362 - Multiple identical `-arch` arguments are now handled without bailing.
364 - The concatenated form of some long compiler options is now recognized, for
365 example when using `-isystemPATH` instead of `-isystem PATH`.
367 - If hard-linking is enabled and but fails (e.g. due to cross-device linking),
368 ccache now falls back to copying instead of running the compiler.
370 - Made the `hash_dir` option only have effect when generating debug info.
372 - ccache now knows how to convert absolute paths to relative paths inside
373 dependency files when using `base_dir`.
375 - Improved parsing of `-g*` options.
377 - Made ccache understand `-Wp,-D*` options.
379 - ccache now understands the undocumented `-coverage` (only one dash) GCC
382 - Names of included files are no longer included in the hash of the compiler's
383 preprocessed output. This leads to more potential cache hits when not using
386 - Increased buffer size used when reading file data. This improves performance
393 - Bail out on too hard compiler option `-P`.
395 - Fixed Clang test suite when running on Linux.
397 - Fixed build and test for MinGW32 and Windows.
402 Release date: 2016-09-28
407 - Fixed a regression in ccache 3.2.8: ccache could get confused when using the
408 compiler option `-Wp,` to pass multiple options to the preprocessor,
409 resulting in missing dependency files from direct mode cache hits.
414 Release date: 2016-09-07
419 - Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
420 path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
421 (`CCACHE_CPP2`) is enabled.
423 - ccache now understands the undocumented `-coverage` (only one dash) GCC
429 Release date: 2016-07-20
434 - Fixed a bug which could lead to false cache hits for compiler command lines
435 with a missing argument to an option that takes an argument.
437 - ccache now knows how to work around a glitch in the output of GCC 6's
443 Release date: 2016-07-12
448 - Fixed build problem on QNX, which lacks ``SA_RESTART''.
450 - Bail out on compiler option `-fstack-usage` since it creates a `.su` file
451 which ccache currently doesn't handle.
453 - Fixed a bug where (due to ccache rewriting paths) the compiler could choose
454 incorrect include files if `CCACHE_BASEDIR` is used and the source file path
455 is absolute and is a symlink.
460 Release date: 2016-04-17
463 New features and enhancements
464 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
466 - Only pass Clang-specific `-stdlib=` to the preprocessor.
468 - Improved handling of stale NFS handles.
470 - Made it harder to misinterpret documentation of boolean environment settings'
477 - Include m4 files used by configure.ac in the source dist archives.
479 - Corrected "Performance" section in the manual regarding `__DATE_`, `__TIME__`
480 and `__FILE__` macros.
482 - Fixed build on Solaris 10+ and AIX 7.
484 - Fixed failure to create directories on QNX.
486 - Don't (try to) update manifest file in ``read-only'' and ``read-only direct''
489 - Fixed a bug in caching of `stat` system calls in ``file_stat_matches
492 - Fixed bug in hashing of Clang plugins, leading to unnecessary cache misses.
494 - Fixed --print-config to show ``pch_defines sloppiness''.
496 - The man page is now built when running ``make install'' from Git repository
502 Release date: 2015-10-08
508 - Fixed build error related to zlib on systems with older make versions
509 (regression in ccache 3.2.3).
511 - Made conversion-to-bool explicit to avoid build warnings (and potential
512 runtime errors) on legacy systems.
514 - Improved signal handling: Kill compiler on SIGTERM; wait for compiler to exit
515 before exiting; die appropriately.
517 - Minor fixes related to Windows support.
519 - The correct compression level is now used if compression is requested.
521 - Fixed a bug where cache cleanup could be run too early for caches larger than
522 64 GiB on 32-bit systems.
527 Release date: 2015-08-16
530 New features and enhancements
531 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
533 - Added support for compiler option `-gsplit-dwarf`.
539 - Support external zlib in nonstandard directory.
541 - Avoid calling `exit()` inside an exit handler.
543 - Let exit handler terminate properly.
545 - Bail out on compiler option `--save-temps` in addition to `-save-temps`.
547 - Only log "Disabling direct mode" once when failing to read potential include
553 Release date: 2015-05-10
556 New features and enhancements
557 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
559 - Added support for `CCACHE_COMPILERCHECK=string:<value>`. This is a faster
560 alternative to `CCACHE_COMPILERCHECK=<command>` if the command's output can
561 be precalculated by the build system.
563 - Add support for caching code coverage results (compiling for gcov).
569 - Made hash of cached result created with and without `CCACHE_CPP2` different.
570 This makes it possible to rebuild with `CCACHE_CPP2` set without having to
571 clear the cache to get new results.
573 - Don't try to reset a non-existing stats file. This avoids ``No such file or
574 directory'' messages in the ccache log when the cache directory doesn't
577 - Fixed a bug where ccache deleted Clang diagnostics after compiler failures.
579 - Avoid performing an unnecessary copy of the object file on a cache miss.
581 - Bail out on too hard compiler option `-fmodules`.
583 - Bail out on too hard compiler option `-fplugin=libcc1plugin` (interaction
586 - Fixed build error when compiling ccache with recent Clang versions.
588 - Removed signal-unsafe code from signal handler.
590 - Corrected logic for when to output cached stderr.
592 - Wipe the whole cached result on failure retrieving a cached file.
594 - Fixed build error when compiling ccache with recent Clang versions.
599 Release date: 2014-12-10
605 - Fixed regression in temporary file handling, which lead to incorrect
606 permissions for stats, manifest and ccache.conf files in the cache.
608 - `CACHEDIR.TAG` files are now created in the [0-9a-f] subdirectories so that
609 ccache.conf is not lost in backups.
611 - Made the default cache size suffix `G`, as previously documented.
613 - `-fdiagnostics-color=auto` is now passed to the compiler even if stderr is
614 redirected. This fixes a problem when, for instance, a configure test probes
615 if the compiler (wrapped via ccache) supports `-fdiagnostics-color=auto`.
617 - Added missing documentation for `max_files` and `max_size` configuration
623 Release date: 2014-11-17
626 New features and enhancements
627 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
629 - Added support for configuring ccache via one or several configuration files
630 instead of via environment variables. Environment variables still have
631 priority but are no longer the recommended way of customizing ccache
632 behavior. See the manual for more information.
634 - Added support for compiler error/warning messages with color.
636 - Made creation of temporary directories and cache directories smarter to avoid
637 unnecessary `stat` calls.
639 - Improved efficiency of the algorithm that scans for `__DATE_` and `__TIME__`
640 tokens in the hashed source code.
642 - Added support for several binaries (separated by space) in `CCACHE_PREFIX`.
644 - The `-c` option is no longer passed to the preprocessor. This fixes problems
645 with Clang and Solaris's C++ compiler.
647 - ccache no longer passes preprocessor options like `-D` and `-I` to the
648 compiler when compiling preprocessed output. This fixes warnings emitted by
651 - Compiler options `-fprofile-generate`, `-fprofile-arcs`, `-fprofile-use` and
652 `-fbranch-probabilities` are now handled without bailing.
654 - Added support for Clang's `--serialize-diagnostic` option, storing the
655 diagnostic file (`.dia`) in the cache.
657 - Added support for precompiled headers when using Clang.
659 - Added support for Clang `.pth` (pretokenized header) files.
661 - Changed the `-x` language option to use the new objective C standard for GCC
664 - On a cache miss, ccache now instructs the compiler to create the object file
665 at the real destination and then copies the file into the cache instead of
666 the other way around. This is needed to support compiler options like
667 `-fprofile-arcs` and `--serialize-diagnostics`.
669 - ccache now checks that included files' ctimes aren't too new. This check can
670 be turned off by adding `include_file_ctime` to the ``ccache sloppiness''
673 - Added possibility to get cache hits based on filename, size, mtime and ctime
674 only. On other words, source code files are not even read, only stat-ed. This
675 operation mode is opt-in by adding `file_stat_matches` to the ``ccache
676 sloppiness'' setting.
678 - The filename part of options like `-Wp,-MDfilename` is no longer included in
679 the hash since the filename doesn't have any bearing on the result.
681 - Added a ``read-only direct'' configuration setting, which is like the
682 ordinary read-only setting except that ccache will only try to retrieve
683 results from the cache using the direct mode, not the preprocessor mode.
685 - The display and interpretation of cache size has been changed to use SI
688 - Default cache size is now 5 GB (was previously 1 GiB).
690 - Added configuration option to set the compression level of compressed object
693 - Added support for `@file` and `-@file` arguments (reading options from a
696 - `-Wl,` options are no longer included in the hash since they don't affect
699 - Bail out on too hard compiler option `-Wp,-P`.
701 - Optimized MD4 calculation code on little-endian systems.
703 - Various improvements and fixes on win32.
705 - Improved logging to the ccache log file.
707 - Added `--dump-manifest` command-line option for debugging purposes.
709 - Added `--with-bundled-zlib` configure option.
711 - Upgraded bundled zlib to version 1.2.8.
713 - Improved `dev.mk` to be more platform independent.
715 - Made the test suite work with Clang and gcc-llvm on OS X.
717 - Various other improvements of the test suite.
723 - Any previous `.stderr` is now removed from the cache when recaching.
725 - Fixed an issue when handling the `-arch` compiler option with an argument.
727 - Fixed race condition when creating the initial cache directory.
729 - Fixed test suite failures when `CC` is a ccache-wrapped compiler.
734 Release date: 2016-07-12
740 - Fixed a bug where (due to ccache rewriting paths) the compiler could choose
741 incorrect include files if `CCACHE_BASEDIR` is used and the source file path
742 is absolute and is a symlink.
747 Release date: 2015-03-07
753 - Fixed bug which could result in false cache hits when source code contains
754 `'"'` followed by `" /*"` or `" //"` (with variations).
756 - Made hash of cached result created with and without `CCACHE_CPP2` different.
757 This makes it possible to rebuild with `CCACHE_CPP2` set without having to
758 clear the cache to get new results.
760 - Don't try to reset a non-existing stats file. This avoids ``No such file or
761 directory'' messages in the ccache log when the cache directory doesn't
767 Release date: 2014-10-19
770 New features and enhancements
771 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
773 - Added support for the `-Xclang` compiler option.
775 - Improved handling of exit code of internally executed processes.
777 - Zero length object files in the cache are now rejected as invalid.
779 - Bail out on option `-gsplit-dwarf` (since it produces multiple output files).
781 - Compiler option `-fdebug-prefix-map` is now ignored (not part of the hash).
782 (The `-fdebug-prefix-map` option may be used in combination with
783 `CCACHE_BASEDIR` to reuse results across different directories.)
785 - Added note in documentation that `--ccache-skip` currently does not mean
786 ``don't hash the following option''.
788 - To enable support for precompiled headers (PCH), `CCACHE_SLOPPINESS` now also
789 needs to include the new `pch_defines` sloppiness. This is because ccache
790 can't detect changes in the source code when only defined macros have been
793 - Stale files in the internal temporary directory (`<ccache_dir>/tmp`) are now
794 cleaned up if they are older than one hour.
800 - Fixed path canonicalization in `make_relative_path()` when path doesn't
803 - Fixed bug in `common_dir_prefix_length()`. This corrects the `CCACHE_BASEDIR`
806 - ccache no longer tries to create the cache directory when `CCACHE_DISABLE` is
809 - Fixed bug when reading manifests with a very large number of file info
812 - Fixed problem with logging of current working directory.
817 Release date: 2013-01-06
823 - The EAGAIN signal is now handled correctly when emitting cached stderr
824 output. This fixes a problem triggered by large error outputs from the
827 - Subdirectories in the cache are no longer created in read-only mode.
829 - Fixed so that ccache's log file descriptor is not made available to the
832 - Improved error reporting when failing to create temporary stdout/stderr files
833 when executing the compiler.
835 - Disappearing temporary stdout/stderr files are now handled gracefully.
841 - Fixed test suite to work on ecryptfs.
846 Release date: 2012-08-11
849 New features and enhancements
850 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
852 - Made paths to dependency files relative in order to increase cache hits.
854 - Added work-around to make ccache work with buggy GCC 4.1 when creating a
857 - Clang plugins are now hashed to catch plugin upgrades.
863 - Fixed crash when the current working directory has been removed.
865 - Fixed crash when stderr is closed.
867 - Corrected a corner case when parsing backslash escapes in string
870 - Paths are now correctly canonicalized when computing paths relative to the
877 - Made git version macro work when compiling outside of the source directory.
879 - Fixed `static_assert` macro definition clash with GCC 4.7.
884 Release date: 2012-01-08
890 - Non-writable `CCACHE_DIR` is now handled gracefully when `CCACHE_READONLY` is
893 - Made failure to create files (typically due to bad directory permissions) in
894 the cache directory fatal. Previously, such failures were silently and
895 erroneously flagged as "compiler produced stdout".
897 - Both the `-specs=file` and `--specs=file` forms are now recognized.
899 - Added recognition and hashing of GCC plugins specified with `-fplugin=file`.
901 - `CCACHE_COMPILERCHECK` now also determines how to hash explicit specs files
904 - Added `CPATH`, `C_INCLUDE_PATH` and similar environment variables to the hash
905 to avoid false cache hits when such variables have changed.
907 - Corrected log message when unify mode is enabled.
909 - Reverted the GCC bug compatibility introduced in ccache 3.1.5 for `-MT`/`-MQ`
910 options with concatenated arguments. (The bug is fixed in recent GCC
917 - Corrected license header for `mdfour.c`.
919 - Improved documentation on how to fix bad object files in the cache.
925 Release date: 2011-08-21
928 New features and enhancements
929 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
931 - Rewrite argument to `--sysroot` if `CCACHE_BASEDIR` is used.
937 - Don't crash if `getcwd()` fails.
939 - Fixed alignment of ``called for preprocessing'' counter.
944 Release date: 2011-05-29
947 New features and enhancements
948 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
950 - Added a new statistics counter named ``called for preprocessing''.
952 - The original command line is now logged to the file specified with
955 - Improved error logging when system calls fail.
957 - Added support for rewriting absolute paths in `-F`/`-iframework` GCC
960 - Improved order of statistics counters in `ccache -s` output.
966 - The `-MF`/`-MT`/`-MQ` options with concatenated argument are now handled
967 correctly when they are last on the command line.
969 - ccache is now bug compatible with GCC for the `-MT`/`-MQ` options with
970 concatenated arguments.
972 - Fixed a minor memory leak.
974 - Systems that lack (and don't need to be linked with) libm are now supported.
979 Release date: 2011-01-09
985 - Made a work-around for a bug in `gzputc()` in zlib 1.2.5.
987 - Corrupt manifest files are now removed so that they won't block direct mode
990 - ccache now copes with file systems that don't know about symbolic links.
992 - The file handle in now correctly closed on write error when trying to create
998 Release date: 2010-11-28
1004 - The -MFarg, -MTarg and -MQarg compiler options (i.e, without space between
1005 option and argument) are now handled correctly.
1011 - Portability fixes for HP-UX 11.00 and other esoteric systems.
1016 Release date: 2010-11-21
1022 - Bail out on too hard compiler options `-fdump-*`.
1024 - NULL return values from malloc/calloc of zero bytes are now handled
1027 - Fixed issue when parsing precompiler output on AIX.
1033 - Improved documentation on which information is included in the hash sum.
1035 - Made the ``too new header file'' test case work on file systems with
1036 unsynchronized clocks.
1038 - The test suite now also works on systems that lack a /dev/zero.
1043 Release date: 2010-11-07
1049 - ccache now falls back to preprocessor mode when a non-regular include file
1050 (device, socket, etc) has been detected so that potential hanging due to
1051 blocking reads is avoided.
1053 - CRC errors are now detected when decompressing compressed files in the cache.
1055 - Fixed potential object file corruption race on NFS.
1057 - Minor documentation corrections.
1059 - Fixed configure detection of ar.
1061 - ccache development version (set by dev.mk) now works with gits whose
1062 `describe` command doesn't understand `--dirty`.
1068 - Minor debug log message improvements.
1073 Release date: 2010-09-16
1076 New features and enhancements
1077 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1079 - Added support for hashing the output of a custom command (e.g. `%compiler%
1080 --version`) to identify the compiler instead of stat-ing or hashing the
1081 compiler binary. This can improve robustness when the compiler (as seen by
1082 ccache) actually isn't the real compiler but another compiler wrapper.
1084 - Added support for caching compilations that use precompiled headers. (See the
1085 manual for important instructions regarding this.)
1087 - Locking of the files containing statistics counters is now done using
1088 symlinks instead of POSIX locks. This should make ccache behave a lot better
1089 on file systems where POSIX locks are slow or broken (e.g. NFS on some
1092 - Manifest files are now updated without the need of taking locks.
1094 - Updates of statistics counters are now always done in one of the sub-level
1095 statistics files. This reduces lock contention, which especially improves
1096 performance on slow NFS mounts.
1098 - Reading and writing of statistics counters has been made forward-compatible
1099 (unknown counters are retained).
1101 - Files are now read without using `mmap()`. This has two benefits: it's more
1102 robust against file changes during reading and it improves performance on
1103 poor systems where `mmap()` doesn't use the disk cache.
1105 - Added `.cp` and `.CP` as known C++ suffixes.
1109 - Added `-install_name` as an option known to take an argument. (This improves
1110 statistics when using the Darwin linker.)
1116 - Non-fatal error messages are now never printed to stderr but logged instead.
1118 - Fixed a bug affecting failing commands when `--ccache-skip` is used.
1120 - Made `--ccache-skip` work for all options.
1122 - EINTR is now handled correctly.
1128 - Work on porting ccache to win32 (native), mostly done by Ramiro Polla. The
1129 port is not yet finished, but will hopefully be complete in some subsequent
1132 - Added a `--nostats` flag to the performance benchmark program.
1134 - Made the performance benchmark program more accurate when measuring cache
1137 - Added a new test framework for unit tests written in C.
1139 - Got rid of `configure-dev`; dev mode is now given by `dev.mk.in` presence.
1141 - Improved documentation on how to combine ccache with other compiler wrappers
1144 - New `LICENSE.txt` file with licensing and copyright details about bundled
1147 - New `AUTHORS.txt` file with a list of ccache contributors.
1149 - New `HACKING.txt` file with some notes about ccache code conventions.
1154 Release date: 2010-07-15
1160 - The statistics counter ``called for link'' is now correctly updated when
1161 linking with a single object file.
1163 - Fixed a problem with out-of-source builds.
1168 Release date: 2010-06-20
1174 - ccache is now licensed under the GNU General Public License (GPL) version 3
1181 - The way the hashes are calculated has changed, so you won't get cache hits
1182 for compilation results stored by older ccache versions. Because of this, you
1183 might as well clear the old cache directory with `ccache --clear` if you
1184 want, unless you plan to keep using an older ccache version.
1187 New features and enhancements
1188 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1190 - ccache now has a ``direct mode'' where it computes a hash of the source code
1191 (including all included files) and compiler options without running the
1192 preprocessor. By not running the preprocessor, CPU usage is reduced; the
1193 speed is somewhere between 1 and 5 times that of ccache running in
1194 traditional mode, depending on the circumstances. The speedup will be higher
1195 when I/O is fast (e.g., when files are in the disk cache). The direct mode
1196 can be disabled by setting +CCACHE_NODIRECT+.
1198 - Support has been added for rewriting absolute paths to relative paths when
1199 hashing, in order to increase cache hit rate when building the same source
1200 code in different directories even when compiling with `-g` and when using
1201 absolute include directory paths. This is done by setting the
1202 `CCACHE_BASEDIR` environment variable to an absolute path that specifies
1203 which paths to rewrite.
1205 - Object files are now optionally stored compressed in the cache. The runtime
1206 cost is negligible, and more files will fit in the ccache directory and in
1207 the disk cache. Set `CCACHE_COMPRESS` to enable object file compression. Note
1208 that you can't use compression in combination with the hard link feature.
1210 - A `CCACHE_COMPILERCHECK` option has been added. This option tells ccache what
1211 compiler-identifying information to hash to ensure that results retrieved
1212 from the cache are accurate. Possible values are: none (don't hash anything),
1213 mtime (hash the compiler's mtime and size) and content (hash the content of
1214 the compiler binary). The default is mtime.
1216 - It is now possible to specify extra files whose contents should be included
1217 in the hash sum by setting the `CCACHE_EXTRAFILES` option.
1219 - Added support for Objective-C and Objective-C\+\+. The statistics counter
1220 ``not a C/C++ file'' has been renamed to ``unsupported source language''.
1222 - Added support for the `-x` compiler option.
1224 - Added support for long command-line options.
1226 - A `CACHEDIR.TAG` file is now created in the cache directory. See
1227 <http://www.brynosaurus.com/cachedir/>.
1229 - Messages printed to the debug log (specified by `CCACHE_LOGFILE`) have been
1232 - You can relax some checks that ccache does in direct mode by setting
1233 `CCACHE_SLOPPINESS`. See the manual for more information.
1235 - `CCACHE_TEMPDIR` no longer needs to be on the same filesystem as
1238 - The default value of `CCACHE_TEMPDIR` has been changed to `$CCACHE_DIR/tmp`
1239 to avoid cluttering the top directory.
1241 - Temporary files that later will be moved into the cache are now created in
1242 the cache directory they will end up in. This makes ccache more friendly to
1243 Linux's directory layout.
1245 - Improved the test suite and added tests for most of the new functionality.
1246 It's now also possible to specify a subset of tests to run.
1248 - Standard error output from the compiler is now only stored in the cache if
1251 - If the compiler produces no object file or an empty object file, but gives a
1252 zero exit status (could be due to a file system problem, a buggy program
1253 specified by `CCACHE_PREFIX`, etc.), ccache copes with it properly.
1255 - Added `installcheck` and `distcheck` make targets.
1257 - Clarified cache size limit options' and cleanup semantics.
1259 - Improved display of cache max size values.
1261 - The following options are no longer hashed in the preprocessor mode:
1262 `-imacros`, `-imultilib`, `-iprefix`, `-iquote`, `-isysroot`, `-iwithprefix`,
1263 `-iwithprefixbefore`, `-nostdinc`, `-nostdinc++` and `-U`.
1269 - Various portability improvements.
1271 - Improved detection of home directory.
1273 - User-defined `CPPFLAGS` and `LDFLAGS` are now respected in the Makefile.
1277 - Computation of the hash sum has been improved to decrease the risk of hash
1278 collisions. For instance, the compiler options `-X -Y` and `-X-Y` previously
1279 contributed equally to the hash sum.
1281 - Bail out on too hard compiler options `--coverage`, `-fprofile-arcs`,
1282 `-fprofile-generate`, `-fprofile-use`, `-frepo`, `-ftest-coverage` and
1283 `-save-temps`. Also bail out on `@file` style options.
1285 - Errors when using multiple `-arch` compiler options are now noted as
1286 ``unsupported compiler option''.
1288 - `-MD`/`-MMD` options without `-MT`/`-MF` are now handled correctly.
1290 - The `-finput-charset` option is now handled correctly.
1292 - Added support for `-Wp,-MD` and `-Wp,-MMD` options.
1294 - The compiler options `-Xassembler`, `-b`, `-G` and `-V` are now correctly
1295 recognized as taking an argument.
1297 - Debug information containing line numbers of predefined and command-line
1298 macros (enabled with the compiler option `-g3`) will now be correct.
1300 - Corrected LRU cleanup handling of object files.
1302 - `utimes()` is now used instead of `utime()` when available.
1304 - Non-writable cache directories are now handled gracefully.
1306 - Corrected documentation about sharing the cache directory.
1308 - Fixed compilation warnings from GCC 4.3.
1310 - The command specified by `CCACHE_PREFIX` is no longer part of the hash.
1312 - Fixed bad memory access spotted by Valgrind.
1314 - Fixed a bug in `x_realloc`.
1316 - Freed memory is no longer referenced when compiling a `.i`/`.ii` file and
1317 falling back to running the real compiler.
1319 - The test suite is now immune to external values of the `CCACHE_*` environment
1322 - Improved detection of recursive invocation.
1324 - The ccache binary is now not unconditionally stripped when installing.
1326 - Statistics counters are now correctly updated for -E option failures and
projects / platform / upstream / ccache.git / blob