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NEWS.txt
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ccache news
===========
ccache 3.4
----------
Unreleased
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- The compiler option form `--sysroot arg` is now handled like the documented
`--sysroot=arg` form.
- Added support for caching `.su` files generated by GCC flag `-fstack-usage`.
- Configuration errors are now treated as warnings instead of fatal errors.
- ccache should now work with distcc's ``pump'' wrapper.
- The optional unifier is no longer disabled when the direct mode is enabled.
ccache 3.3.5
------------
Not yet released
Bug fixes
~~~~~~~~~
- Fixed a regression where the original order of debug options could be lost.
This reverts the ``Improved parsing of `-g*` options'' feature in ccache 3.3.
- Multiple `-fdebug-prefix-map` options should now be handled correctly.
- Fixed matching of directories in the `ignore_headers_in_manifest`
configuration option.
- Fixed detection of missing argument to `-opt`/`--options-file`.
ccache 3.3.4
------------
Release date: 2017-02-17
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Documented the different cache statistics counters.
Bug fixes
~~~~~~~~~
- Fixed a regression in ccache 3.3 related to potentially bad content of
dependency files when compiling identical source code but with different
source paths. This was only partially fixed in 3.3.2 and reverts the new
``Names of included files are no longer included in the hash of the
compiler's preprocessed output'' feature in 3.3.
- Corrected statistics counter for `-optf`/`--options-file` failure.
- Fixed undefined behavior warnings in ccache found by `-fsanitize=undefined`.
ccache 3.3.3
------------
Release date: 2016-10-26
Bug fixes
~~~~~~~~~
- ccache now detects usage of `.incbin` assembler directives in the source code
and avoids caching such compilations.
ccache 3.3.2
------------
Release date: 2016-09-28
Bug fixes
~~~~~~~~~
- Fixed a regression in ccache 3.3 related to potentially bad content of
dependency files when compiling identical source code but with different
source paths.
- Fixed a regression in ccache 3.3.1: ccache could get confused when using the
compiler option `-Wp,` to pass multiple options to the preprocessor,
resulting in missing dependency files from direct mode cache hits.
ccache 3.3.1
------------
Release date: 2016-09-07
Bug fixes
~~~~~~~~~
- Fixed a problem in the ``multiple `-arch` options'' support introduced in
3.3. When using the direct mode (the default), different combinations of
`-arch` options were not detected properly.
- Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
(`CCACHE_CPP2`) is enabled.
ccache 3.3
----------
Release date: 2016-08-27
Notes
~~~~~
- A C99-compatible compiler is now required to build ccache.
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- The configuration option `run_second_cpp` (`CCACHE_CPP2`) now defaults to
true. This improves ccache's out-of-the-box experience for compilers that
can't compile their own preprocessed output with the same outcome as if they
compiled the real source code directly, e.g. newer versions of GCC and Clang.
- The configuration option `hash_dir` (`CCACHE_HASHDIR`) now defaults to true.
- Added a new `ignore_headers_in_manifest` configuration option, which
specifies headers that should be ignored in the direct mode.
- Added a new `prefix_command_cpp` (`CCACHE_PREFIX_CPP`) configuration option,
which specifies one or several prefixes to add to the command line ccache
uses when invoking the preprocessor.
- Added a new `limit_multiple` (`CCACHE_LIMIT_MULTIPLE`) configuration option,
which specifies how much of the cache to remove when cleaning.
- Added a new `keep_comments_cpp` (`CCACHE_COMMENTS`) configuration option,
which tells ccache not to discard the comments before hashing preprocessor
output. This can be used to check documentation with *-Wdocumentation*.
- Added a new sloppiness option `no_system_headers`, which tells ccache not to
include system headers in manifest files.
- Added a new statistics counter that tracks the number of performed cleanups
due to the cache size being over the limit. The value is shown in the output
of ``ccache -s''.
- Added support for relocating debug info directory using `-fdebug-prefix-map`.
This allows for cache hits even when `hash_dir` is used in combination with
`base_dir`.
- Added a new ``cache hit rate'' field to the output of ``ccache -s''.
- Added support for caching compilation of assembler code produced by e.g.
``gcc -S file.c''.
- Added support for cuda including the -optf/--options-file option.
- Added support for Fortran 77.
- Added support for multiple `-arch` options to produce "fat binaries".
- Multiple identical `-arch` arguments are now handled without bailing.
- The concatenated form of some long compiler options is now recognized, for
example when using `-isystemPATH` instead of `-isystem PATH`.
- If hard-linking is enabled and but fails (e.g. due to cross-device linking),
ccache now falls back to copying instead of running the compiler.
- Made the `hash_dir` option only have effect when generating debug info.
- ccache now knows how to convert absolute paths to relative paths inside
dependency files when using `base_dir`.
- Improved parsing of `-g*` options.
- Made ccache understand `-Wp,-D*` options.
- ccache now understands the undocumented `-coverage` (only one dash) GCC
option.
- Names of included files are no longer included in the hash of the compiler's
preprocessed output. This leads to more potential cache hits when not using
the direct mode.
- Increased buffer size used when reading file data. This improves performance
slightly.
Bug fixes
~~~~~~~~~
- Bail out on too hard compiler option `-P`.
- Fixed clang test suite when running on Linux.
- Fixed build and test for MinGW32 and Windows.
ccache 3.2.9
------------
Release date: 2016-09-28
Bug fixes
~~~~~~~~~
- Fixed a regression in ccache 3.2.8: ccache could get confused when using the
compiler option `-Wp,` to pass multiple options to the preprocessor,
resulting in missing dependency files from direct mode cache hits.
ccache 3.2.8
------------
Release date: 2016-09-07
Bug fixes
~~~~~~~~~
- Fixed an issue when compiler option `-Wp,-MT,path` is used instead of `-MT
path` (and similar for `-MF`, `-MP` and `-MQ`) and `run_second_cpp`
(`CCACHE_CPP2`) is enabled.
- ccache now understands the undocumented `-coverage` (only one dash) GCC
option.
ccache 3.2.7
------------
Release date: 2016-07-20
Bug fixes
~~~~~~~~~
- Fixed a bug which could lead to false cache hits for compiler command lines
with a missing argument to an option that takes an argument.
- ccache now knows how to work around a glitch in the output of GCC 6's
preprocessor.
ccache 3.2.6
------------
Release date: 2016-07-12
Bug fixes
~~~~~~~~~
- Fixed build problem on QNX, which lacks ``SA_RESTART''.
- Bail out on compiler option `-fstack-usage` since it creates a `.su` file
which ccache currently doesn't handle.
- Fixed a bug where (due to ccache rewriting paths) the compiler could choose
incorrect include files if `CCACHE_BASEDIR` is used and the source file path
is absolute and is a symlink.
ccache 3.2.5
------------
Release date: 2016-04-17
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Only pass clang-specific `-stdlib=` to the preprocessor.
- Improved handling of stale NFS handles.
- Made it harder to misinterpret documentation of boolean environment settings'
semantics.
Bug fixes
~~~~~~~~~
- Include m4 files used by configure.ac in the source dist archives.
- Corrected "Performance" section in the manual regarding `__DATE_`, `__TIME__`
and `__FILE__` macros.
- Fixed build on Solaris 10+ and AIX 7.
- Fixed failure to create directories on QNX.
- Don't (try to) update manifest file in ``read-only'' and ``read-only direct''
modes.
- Fixed a bug in caching of `stat` system calls in ``file_stat_matches
sloppiness mode''.
- Fixed bug in hashing of clang plugins, leading to unnecessary cache misses.
- Fixed --print-config to show ``pch_defines sloppiness''.
- The man page is now built when running ``make install'' from Git repository
sources.
ccache 3.2.4
------------
Release date: 2015-10-08
Bug fixes
~~~~~~~~~
- Fixed build error related to zlib on systems with older make versions
(regression in ccache 3.2.3).
- Made conversion-to-bool explicit to avoid build warnings (and potential
runtime errors) on legacy systems.
- Improved signal handling: Kill compiler on SIGTERM; wait for compiler to exit
before exiting; die appropriately.
- Minor fixes related to Windows support.
- The correct compression level is now used if compression is requested.
- Fixed a bug where cache cleanup could be run too early for caches larger than
64 GiB on 32-bit systems.
ccache 3.2.3
------------
Release date: 2015-08-16
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added support for compiler option `-gsplit-dwarf`.
Bug fixes
~~~~~~~~~
- Support external zlib in nonstandard directory.
- Avoid calling `exit()` inside an exit handler.
- Let exit handler terminate properly.
- Bail out on compiler option `--save-temps` in addition to `-save-temps`.
- Only log "Disabling direct mode" once when failing to read potential include
files.
ccache 3.2.2
------------
Release date: 2015-05-10
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added support for `CCACHE_COMPILERCHECK=string:<value>`. This is a faster
alternative to `CCACHE_COMPILERCHECK=<command>` if the command's output can
be precalculated by the build system.
- Add support for caching code coverage results (compiling for gcov).
Bug fixes
~~~~~~~~~
- Made hash of cached result created with and without `CCACHE_CPP2` different.
This makes it possible to rebuild with `CCACHE_CPP2` set without having to
clear the cache to get new results.
- Don't try to reset a non-existing stats file. This avoids ``No such file or
directory'' messages in the ccache log when the cache directory doesn't
exist.
- Fixed a bug where ccache deleted clang diagnostics after compiler failures.
- Avoid performing an unnecessary copy of the object file on a cache miss.
- Bail out on too hard compiler option `-fmodules`.
- Bail out on too hard compiler option `-fplugin=libcc1plugin` (interaction
with GDB).
- Fixed build error when compiling ccache with recent clang versions.
- Removed signal-unsafe code from signal handler.
- Corrected logic for when to output cached stderr.
- Wipe the whole cached result on failure retrieving a cached file.
- Fixed build error when compiling ccache with recent clang versions.
ccache 3.2.1
------------
Release date: 2014-12-10
Bug fixes
~~~~~~~~~
- Fixed regression in temporary file handling, which lead to incorrect
permissions for stats, manifest and ccache.conf files in the cache.
- `CACHEDIR.TAG` files are now created in the [0-9a-f] subdirectories so that
ccache.conf is not lost in backups.
- Made the default cache size suffix `G`, as previously documented.
- `-fdiagnostics-color=auto` is now passed to the compiler even if stderr is
redirected. This fixes a problem when, for instance, a configure test probes
if the compiler (wrapped via ccache) supports `-fdiagnostics-color=auto`.
- Added missing documentation for `max_files` and `max_size` configuration
options.
ccache 3.2
----------
Release date: 2014-11-17
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added support for configuring ccache via one or several configuration files
instead of via environment variables. Environment variables still have
priority but are no longer the recommended way of customizing ccache
behavior. See the manual for more information.
- Added support for compiler error/warning messages with color.
- Made creation of temporary directories and cache directories smarter to avoid
unnecessary `stat` calls.
- Improved efficiency of the algorithm that scans for `__DATE_` and `__TIME__`
tokens in the hashed source code.
- Added support for several binaries (separated by space) in `CCACHE_PREFIX`.
- The `-c` option is no longer passed to the preprocessor. This fixes problems
with clang and Solaris's C++ compiler.
- ccache no longer passes preprocessor options like `-D` and `-I` to the
compiler when compiling preprocessed output. This fixes warnings emitted by
clang.
- Compiler options `-fprofile-generate`, `-fprofile-arcs`, `-fprofile-use` and
`-fbranch-probabilities` are now handled without bailing.
- Added support for clang's `--serialize-diagnostic` option, storing the
diagnostic file (`.dia`) in the cache.
- Added support for precompiled headers when using clang.
- Added support for clang `.pth` (pretokenized header) files.
- Changed the `-x` language option to use the new objective C standard for GCC
and clang.
- On a cache miss, ccache now instructs the compiler to create the object file
at the real destination and then copies the file into the cache instead of
the other way around. This is needed to support compiler options like
`-fprofile-arcs` and `--serialize-diagnostics`.
- ccache now checks that included files' ctimes aren't too new. This check can
be turned off by adding `include_file_ctime` to the ``ccache sloppiness''
setting.
- Added possibility to get cache hits based on filename, size, mtime and ctime
only. On other words, source code files are not even read, only stat-ed. This
operation mode is opt-in by adding `file_stat_matches` to the ``ccache
sloppiness'' setting.
- The filename part of options like `-Wp,-MDfilename` is no longer included in
the hash since the filename doesn't have any bearing on the result.
- Added a ``read-only direct'' configuration setting, which is like the
ordinary read-only setting except that ccache will only try to retrieve
results from the cache using the direct mode, not the preprocessor mode.
- The display and interpretation of cache size has been changed to use SI
units.
- Default cache size is now 5 GB (was previously 1 GiB).
- Added configuration option to set the compression level of compressed object
files in the cache.
- Added support for `@file` and `-@file` arguments (reading options from a
file).
- `-Wl,` options are no longer included in the hash since they don't affect
compilation.
- Bail out on too hard compiler option `-Wp,-P`.
- Optimized MD4 calculation code on little-endian systems.
- Various improvements and fixes on win32.
- Improved logging to the ccache log file.
- Added `--dump-manifest` command-line option for debugging purposes.
- Added `--with-bundled-zlib` configure option.
- Upgraded bundled zlib to version 1.2.8.
- Improved `dev.mk` to be more platform independent.
- Made the test suite work with clang and gcc-llvm on OS X.
- Various other improvements of the test suite.
Bug fixes
~~~~~~~~~
- Any previous `.stderr` is now removed from the cache when recaching.
- Fixed an issue when handling the `-arch` compiler option with an argument.
- Fixed race condition when creating the initial cache directory.
- Fixed test suite failures when `CC` is a ccache-wrapped compiler.
ccache 3.1.12
-------------
Release date: 2016-07-12
Bug fixes
~~~~~~~~~
- Fixed a bug where (due to ccache rewriting paths) the compiler could choose
incorrect include files if `CCACHE_BASEDIR` is used and the source file path
is absolute and is a symlink.
ccache 3.1.11
-------------
Release date: 2015-03-07
Bug fixes
~~~~~~~~~
- Fixed bug which could result in false cache hits when source code contains
`'"'` followed by `" /*"` or `" //"` (with variations).
- Made hash of cached result created with and without `CCACHE_CPP2` different.
This makes it possible to rebuild with `CCACHE_CPP2` set without having to
clear the cache to get new results.
- Don't try to reset a non-existing stats file. This avoids ``No such file or
directory'' messages in the ccache log when the cache directory doesn't
exist.
ccache 3.1.10
-------------
Release date: 2014-10-19
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added support for the `-Xclang` compiler option.
- Improved handling of exit code of internally executed processes.
- Zero length object files in the cache are now rejected as invalid.
- Bail out on option `-gsplit-dwarf` (since it produces multiple output files).
- Compiler option `-fdebug-prefix-map` is now ignored (not part of the hash).
(The `-fdebug-prefix-map` option may be used in combination with
`CCACHE_BASEDIR` to reuse results across different directories.)
- Added note in documentation that `--ccache-skip` currently does not mean
``don't hash the following option''.
- To enable support for precompiled headers (PCH), `CCACHE_SLOPPINESS` now also
needs to include the new `pch_defines` sloppiness. This is because ccache
can't detect changes in the source code when only defined macros have been
changed.
- Stale files in the internal temporary directory (`<ccache_dir>/tmp`) are now
cleaned up if they are older than one hour.
Bug fixes
~~~~~~~~~
- Fixed path canonicalization in `make_relative_path()` when path doesn't
exist.
- Fixed bug in `common_dir_prefix_length()`. This corrects the `CCACHE_BASEDIR`
behavior.
- ccache no longer tries to create the cache directory when `CCACHE_DISABLE` is
set.
- Fixed bug when reading manifests with a very large number of file info
entries.
- Fixed problem with logging of current working directory.
ccache 3.1.9
------------
Release date: 2013-01-06
Bug fixes
~~~~~~~~~
- The EAGAIN signal is now handled correctly when emitting cached stderr
output. This fixes a problem triggered by large error outputs from the
compiler.
- Subdirectories in the cache are no longer created in read-only mode.
- Fixed so that ccache's log file descriptor is not made available to the
compiler.
- Improved error reporting when failing to create temporary stdout/stderr files
when executing the compiler.
- Disappearing temporary stdout/stderr files are now handled gracefully.
Other
~~~~~
- Fixed test suite to work on ecryptfs.
ccache 3.1.8
------------
Release date: 2012-08-11
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Made paths to dependency files relative in order to increase cache hits.
- Added work-around to make ccache work with buggy GCC 4.1 when creating a
pre-compiled header.
- Clang plugins are now hashed to catch plugin upgrades.
Bug fixes
~~~~~~~~~
- Fixed crash when the current working directory has been removed.
- Fixed crash when stderr is closed.
- Corrected a corner case when parsing backslash escapes in string
literals.
- Paths are now correctly canonicalized when computing paths relative to the
base directory.
Other
~~~~~
- Made git version macro work when compiling outside of the source directory.
- Fixed `static_assert` macro definition clash with GCC 4.7.
ccache 3.1.7
------------
Release date: 2012-01-08
Bug fixes
~~~~~~~~~
- Non-writable `CCACHE_DIR` is now handled gracefully when `CCACHE_READONLY` is
set.
- Made failure to create files (typically due to bad directory permissions) in
the cache directory fatal. Previously, such failures were silently and
erroneously flagged as "compiler produced stdout".
- Both the `-specs=file` and `--specs=file` forms are now recognized.
- Added recognition and hashing of GCC plugins specified with `-fplugin=file`.
- `CCACHE_COMPILERCHECK` now also determines how to hash explicit specs files
(`-specs=file`).
- Added `CPATH`, `C_INCLUDE_PATH` and similar environment variables to the hash
to avoid false cache hits when such variables have changed.
- Corrected log message when unify mode is enabled.
- Reverted the GCC bug compatibility introduced in ccache 3.1.5 for `-MT`/`-MQ`
options with concatenated arguments. (The bug is fixed in recent GCC
versions.)
Other
~~~~~
- Corrected license header for `mdfour.c`.
- Improved documentation on how to fix bad object files in the cache.
ccache 3.1.6
------------
Release date: 2011-08-21
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Rewrite argument to `--sysroot` if `CCACHE_BASEDIR` is used.
Bug fixes
~~~~~~~~~
- Don't crash if `getcwd()` fails.
- Fixed alignment of ``called for preprocessing'' counter.
ccache 3.1.5
------------
Release date: 2011-05-29
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added a new statistics counter named ``called for preprocessing''.
- The original command line is now logged to the file specified with
`CCACHE_LOGFILE`.
- Improved error logging when system calls fail.
- Added support for rewriting absolute paths in `-F`/`-iframework` GCC
options.
- Improved order of statistics counters in `ccache -s` output.
Bug fixes
~~~~~~~~~
- The `-MF`/`-MT`/`-MQ` options with concatenated argument are now handled
correctly when they are last on the command line.
- ccache is now bug compatible with GCC for the `-MT`/`-MQ` options with
concatenated arguments.
- Fixed a minor memory leak.
- Systems that lack (and don't need to be linked with) libm are now supported.
ccache 3.1.4
------------
Release date: 2011-01-09
Bug fixes
~~~~~~~~~
- Made a work-around for a bug in `gzputc()` in zlib 1.2.5.
- Corrupt manifest files are now removed so that they won't block direct mode
hits.
- ccache now copes with file systems that don't know about symbolic links.
- The file handle in now correctly closed on write error when trying to create
a cache dir tag.
ccache 3.1.3
------------
Release date: 2010-11-28
Bug fixes
~~~~~~~~~
- The -MFarg, -MTarg and -MQarg compiler options (i.e, without space between
option and argument) are now handled correctly.
Other
~~~~~
- Portability fixes for HP-UX 11.00 and other esoteric systems.
ccache 3.1.2
------------
Release date: 2010-11-21
Bug fixes
~~~~~~~~~
- Bail out on too hard compiler options `-fdump-*`.
- NULL return values from malloc/calloc of zero bytes are now handled
correctly.
- Fixed issue when parsing precompiler output on AIX.
Other
~~~~~
- Improved documentation on which information is included in the hash sum.
- Made the ``too new header file'' test case work on file systems with
unsynchronized clocks.
- The test suite now also works on systems that lack a /dev/zero.
ccache 3.1.1
------------
Release date: 2010-11-07
Bug fixes
~~~~~~~~~
- ccache now falls back to preprocessor mode when a non-regular include file
(device, socket, etc) has been detected so that potential hanging due to
blocking reads is avoided.
- CRC errors are now detected when decompressing compressed files in the cache.
- Fixed potential object file corruption race on NFS.
- Minor documentation corrections.
- Fixed configure detection of ar.
- ccache development version (set by dev.mk) now works with gits whose
`describe` command doesn't understand `--dirty`.
Other
~~~~~
- Minor debug log message improvements.
ccache 3.1
----------
Release date: 2010-09-16
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added support for hashing the output of a custom command (e.g. `%compiler%
--version`) to identify the compiler instead of stat-ing or hashing the
compiler binary. This can improve robustness when the compiler (as seen by
ccache) actually isn't the real compiler but another compiler wrapper.
- Added support for caching compilations that use precompiled headers. (See the
manual for important instructions regarding this.)
- Locking of the files containing statistics counters is now done using
symlinks instead of POSIX locks. This should make ccache behave a lot better
on file systems where POSIX locks are slow or broken (e.g. NFS on some
systems).
- Manifest files are now updated without the need of taking locks.
- Updates of statistics counters are now always done in one of the sub-level
statistics files. This reduces lock contention, which especially improves
performance on slow NFS mounts.
- Reading and writing of statistics counters has been made forward-compatible
(unknown counters are retained).
- Files are now read without using `mmap()`. This has two benefits: it's more
robust against file changes during reading and it improves performance on
poor systems where `mmap()` doesn't use the disk cache.
- Added `.cp` and `.CP` as known C++ suffixes.
- Improved logging.
- Added `-install_name` as an option known to take an argument. (This improves
statistics when using the Darwin linker.)
Bug fixes
~~~~~~~~~
- Non-fatal error messages are now never printed to stderr but logged instead.
- Fixed a bug affecting failing commands when `--ccache-skip` is used.
- Made `--ccache-skip` work for all options.
- EINTR is now handled correctly.
Other
~~~~~
- Work on porting ccache to win32 (native), mostly done by Ramiro Polla. The
port is not yet finished, but will hopefully be complete in some subsequent
release.
- Added a `--nostats` flag to the performance benchmark program.
- Made the performance benchmark program more accurate when measuring cache
hits.
- Added a new test framework for unit tests written in C.
- Got rid of `configure-dev`; dev mode is now given by `dev.mk.in` presence.
- Improved documentation on how to combine ccache with other compiler wrappers
(like `distcc`).
- New `LICENSE.txt` file with licensing and copyright details about bundled
source code.
- New `AUTHORS.txt` file with a list of ccache contributors.
- New `HACKING.txt` file with some notes about ccache code conventions.
ccache 3.0.1
------------
Release date: 2010-07-15
Bug fixes
~~~~~~~~~
- The statistics counter ``called for link'' is now correctly updated when
linking with a single object file.
- Fixed a problem with out-of-source builds.
ccache 3.0
----------
Release date: 2010-06-20
General
~~~~~~~
- ccache is now licensed under the GNU General Public License (GPL) version 3
or later.
Upgrade notes
~~~~~~~~~~~~~
- The way the hashes are calculated has changed, so you won't get cache hits
for compilation results stored by older ccache versions. Because of this, you
might as well clear the old cache directory with `ccache --clear` if you
want, unless you plan to keep using an older ccache version.
New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- ccache now has a ``direct mode'' where it computes a hash of the source code
(including all included files) and compiler options without running the
preprocessor. By not running the preprocessor, CPU usage is reduced; the
speed is somewhere between 1 and 5 times that of ccache running in
traditional mode, depending on the circumstances. The speedup will be higher
when I/O is fast (e.g., when files are in the disk cache). The direct mode
can be disabled by setting +CCACHE_NODIRECT+.
- Support has been added for rewriting absolute paths to relative paths when
hashing, in order to increase cache hit rate when building the same source