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150 lines
5.5 KiB
Plaintext
150 lines
5.5 KiB
Plaintext
ccache news
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===========
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ccache 3.0pre1 (unreleased)
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---------------------------
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Changes since version 2.4.
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General
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~~~~~~~
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- ccache is now licensed under the GNU Public License (GPL) version 3 or
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later.
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Upgrade notes
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~~~~~~~~~~~~~
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- The way the hashes are calculated has changed, so you won't get cache
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hits for compilation results stored by older ccache versions.
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- The statistics counters ``files in cache'' and ``cache size'' now only
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count object files. (Previously, files containing cached standard error
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output were counted as well.) The existing values of the two counters
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will be erroneous at first after the upgrade, but will correct themselves
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eventually when enough cleanups have been made, or when you run +ccache
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--cleanup+.
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- The ``max file'' and ``max cache size'' settings now specify thresholds
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for object files count and size.
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- Because of the changes mentioned above, you might as well clear the old
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cache directory with `ccache --cleanup` if you want, unless you plan to
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keep using an older ccache version.
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New features and improvements
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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- ccache now has a ``direct mode'' where it computes a hash of the source
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code and compiler arguments without running the preprocessor. By not
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running the preprocessor, CPU usage is reduced; the runtime is about
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0.2-1.0 times that of ccache running in traditional mode. The relative
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speedup will be higher when I/O is fast (e.g., when files are in the disk
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cache). The direct mode can be disabled by setting +CCACHE_NODIRECT+.
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- When hashing the output from the preprocessor, absolute paths are
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rewritten to relative paths, but only for paths under the directory
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specified by `CCACHE_BASEDIR`. Paths specified by `-I` and similar
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options get the same treatment. This is done to get cache hits even when
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compiling with `-g` and when using absolute include directory paths.
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Absolute paths in the standard error text will also be more accurate. The
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default value of `CCACHE_BASEDIR` is the current working directory. To
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disable the rewriting, set `CCACHE_BASEDIR` to the empty string.
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- Object files are now by default stored compressed in the cache. The
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runtime cost is negligible, and more files will fit in the ccache
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directory and in the disk cache. `CCACHE_NOCOMPRESS` can be set to
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disable object file compression.
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- A `CCACHE_COMPILERCHECK` option has been added. This option tells ccache
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what compiler-identifying information to hash to ensure that results
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retrieved from the cache are accurate. Possible values are: none (don't
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hash anything), mtime (hash the compiler's mtime and size) and content
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(hash the content of the compiler binary). The default is mtime.
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- Temporary files are now created in the directory they will end up in.
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This makes ccache more friendly to Linux's directory layout.
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- Added support for long command-line options.
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- A `CACHEDIR.TAG` file is now created in the cache directory. See
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<http://www.brynosaurus.com/cachedir/>.
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- Messages printed to the debug log (specified by `CCACHE_LOGFILE`) have
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been improved.
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- By default, ccache now puts temporary files in `$CCACHE_DIR/tmp` to avoid
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cluttering the top directory.
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- Improved the test suite and added tests for most of the new
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functionality. It's now also possible to specify a subset of tests to
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run.
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- Standard error output from the compiler is now only stored in the cache
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if it's non-empty.
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- If the compiler produces no object file or an empty object file, but
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gives a zero exit status (could be due to a file system problem, a buggy
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program specified by `CCACHE_PREFIX`, etc.), ccache copes with it
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properly.
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- Added installcheck and distcheck make targets.
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- Clarified cache size limit options' semantics.
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- Improved display of cache max size values.
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- For debugging purposes, the variable `CCACHE_VERBOSE` may now be set to
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make ccache print executed commands to standard output.
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Bug fixes
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~~~~~~~~~
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- Fixed build on FreeBSD.
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- Improved detection of home directory.
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- User-defined `CPPFLAGS` and `LDFLAGS` are now respected in the Makefile.
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- Fixed NFS issues.
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- Bail out on too hard compiler options `--coverage`, `-fprofile-arcs`,
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`-fprofile-generate`, `-fprofile-use`, `-ftest-coverage` and
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`-save-temps`. Also bail out on `@file` style options.
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- `-MD`/`-MMD` options without `-MT`/`-MF` are now handled correctly.
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- The `-finput-charset` option is now handled correctly.
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- Added support for `-Wp,-MD` and `-Wp,-MMD` options.
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- Debug information containing line numbers of predefined and command-line
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macros (enabled with the compiler option `-g3`) will now be correct.
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- Corrected LRU cleanup handling of object files.
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- `utimes()` is now used instead of `utime()` when available.
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- Non-writable cache directories are now handled gracefully.
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- Corrected documentation about sharing the cache directory.
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- Fixed compilation warnings from GCC 4.3.
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- The command specified by `CCACHE_PREFIX` is no longer part of the hash.
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- Fixed bad memory access spotted by Valgrind.
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- Fixed a bug in `x_realloc`.
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- Freed memory is no longer referenced when compiling a `.i`/`.ii` file and
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falling back to running the real compiler.
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- The test suite is now immune to external values of the `CCACHE_*`
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environment variables.
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