Add news for version 3.1

diff --git a/NEWS.txt b/NEWS.txt
index cd06d42745c56ae5d92ccfa05c4a9c5094beb9b3..374b756c1c36d29ac11b0879446ebdb5f91774a9 100644 (file)
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -2,6 +2,67 @@ ccache news
 ===========
 
 
+ccache 3.1pre1
+--------------
+Release date: TBD
+
+New features and improvements
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    - Added support for hashing the output of a custom command 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 compilations using 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 (e.g. NFS) where broken POSIX locks are slow or
+      broken.
+    - Locks are no longer taken when updating manifest files. (A race between
+      two writing processes will only result in one lost entry, which is not a
+      big deal, and it's also very unlikely.)
+    - 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 is now 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 bug affecting failing commands when `--ccache-skip` is used.
+
+
+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 detail 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