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NEWS
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distcc-3.z 2024-6-10
UNRELEASED FEATURES:
* (Linux) Added dcc_free_mem reporting of available system memory in the
"stats" output. PR #523 (Whisperity)
distcc-3.4 "Lax lexer" 2021-4-11
FEATURES:
* distccmon-gnome ported from gtk2 to gtk3
* Remove debug lag in spawning new threads. (better multi-core performance)
* Bug fixes.
distcc-3.3 "Charlie the unicorn" 2018-3-3
FEATURES:
* Use masquerade as compiler white-list. Bug #155 d849ca2. (Shawn Landden)
* New --allow-private (the default) which allows non-global
IP and IPv6 addresses. (Shawn Landden)
* Cross-compilation support. PR #244. (Shawn Landden)
* Fix parsing of IPv6 addresses. PR #175 (Bing Sun)
* Python 3, not python 2.
* Can build without python (and without pump mode or tests).
distcc-3.2 "Back in black" 2011-10-11
FEATURES:
* IPv6 support (adshea, Benjamin R. Haskell, Bob Ham).
* Optional support for GSS-API authentication (Ian Baker at CERN)
* Added an environment variable DISTCC_SKIP_LOCAL_RETRY for skipping
the local retry in case of a remote compilation failure (Ryan Burns).
* Some constants that were previously hard-coded in the
sources are now configurable via environment variables:
DISTCC_MAX_DISCREPANCY, DISTCC_IO_TIMEOUT (Lei Zhang).
BUG FIXES:
* Fixed the following 20 issues <http://code.google.com/p/distcc/issues/list>:
30: 3.0 on OSX: ValueError: Expected absolute path, but got '(framework'.
33: distcc --scan-includes dumps core
34: Zeroconf fails if avahi supports IPv6
35: Include server internal error: '<class 'sre_constants.error'>: ('bogus escape (end of line)',)'
36: distcc-mon-gnome displays multiple rows for same host/slot
39: build with gcc 4.1 snprintf.h error "expected declaration specifiers"
42: distcc --show-hosts fails when using Avahi with IPv6 support and +zeroconf for distcc.
43: Remove duplicate hosts from zeroconf list
44: Failed tests on make check (gentoo gcc-4.3.3)
46: Add TAGS target to Makefile.in
49: make check fails on PreprocessAsm_Case
57: Fix warnings
58: PUMP mode can`t PARSE the HOSTS
60: CPlusPlus test case fails with GCC 4.4.1
61: Gdb tests fail in pumped mode on Ubuntu 9.10 amd64
66: pump mode fails to compile certain KDE-4 packages, finds/looks for incorrect headers
70: variable overlapping causing errors..
75: include_server documentation, distcc_fallback flag incorrect
81: distcc 3.1 will not compile correctly with current version of gcc
distcc-3.1 "Humming along" 2008-11-21
FEATURES:
* New "--scan-includes" option to distcc. This shows which
headers distcc would send to the remote machine in pump mode,
without actually compiling anything. This provides a simple
interface to the include server.
* New "--disable-Werror" option to configure.
This disables the use of gcc's -Werror option when building
distcc, allowing compilation of distcc to succeed even if
gcc issues warnings.
DOCUMENTATION:
* Document all of the exit codes in the man page
(Carsten Wolff <[email protected]>, via Debian).
BUG FIXES:
* Handle "-Wp,-MMD,...".
* Report a better error message if a host specification contains ",cpp"
but not ",lzo".
* Fix a bug where the "m4" directory wasn't included in the
source distribution tarball, which caused it to stop working
if you ran autogen.sh.
PORTABILITY:
* Fixed a bug where the pump script was hard-coding /etc/distcc/hosts
rather than using the prefix specified to configure.
* Fixed build errors on Gentoo Linux and some other systems
(Matsuu Takuto).
distcc-3.0 "The moment has arrived" 2008-08-06
DOCUMENTATION:
* Minor improvements to the man pages.
distcc-3.0rc4 "Pump up the volume" 2008-08-04
BUG FIXES:
* Fixed a bug in 3.0rc3 that broke pump mode for C++ compilations
that use -I options that refer to a subdirectory of one of the
default system include directories, e.g. -I/usr/include/foo.
distcc-3.0rc3 "Third time lucky?" 2008-07-31
FEATURES:
* New "--without-avahi" option to configure (Lei Zhang).
BUG FIXES:
* Fixed a problem where pump mode was falling back to local compilation
when compiling with -I options that refer to a subdirectory of one
of the default system include directories (Nils Klarlund, Fergus Henderson).
* Allow distcc to distribute commands that use "-MF<filename>"
rather than "-MF <filename>", and likewise for "-MT<target>".
PORTABILITY:
* Fixed a build problem on ARM and Solaris systems.
* Fixed a build problem on some Linux systems reported by Daisuke Nishikawa.
* Fixed failure of "make install" on Cygwin.
distcc-3.0rc2 "Anti-aliasing." 2008-06-19
BUG FIXES:
* Fallback to local compilation for "-march=native" or "mtune=native"
(Maks Verver).
* Fix for deadlock in pump mode.
distcc-3.0rc1 "My prices are insane." 2008-06-09
FEATURES:
* New protocol, version 3, allowing for preprocessing on distcc
servers ("pump" mode).
* New component: an include server for incremental static analysis of include
dependencies. This software is written in Python 2.4.
* Support for getting hosts via avahi (Lennart Poettering)
BUG FIXES:
* gcc debug option -d must be run locally because it produces
secondary files. Reported by Nadim Khemir.
* Improved checking for errors on socket connection. Patch
from Dan Kegel.
PORTABILITY:
* "Pump" code tested under Linux only. Processing of object code
rewrites debug info (so server paths are replaced with client
paths), but this works for ELF code only.
* Fix failure of 'make maintainer-check' in non-English locales.
(Niklaus Giger)
* Locks taken through F_SETLK or lockf() must be explicitly released,
because closing the file does not do so.
(Sascha Demetrio)
* Use python2.4 if available.
* Execute compiler with correctly redirected output using win32 apis on
Cygwin/Mingw. Place temporary files using GetTempPath. (Alex Besogonov)
* Make distccmon-gnome link properly with gnu ld's new --as-needed
flag. (Ben Skeggs, Lisa Seelye)
OTHER CHANGES:
* New web site: <http://distcc.googlecode.com>.
* New repository: <http://distcc.googlecode.com/svn/trunk/>.
* New maintainer: Fergus Henderson.
distcc-2.18.3 "Porsche safari" 2004-11-30
BUG FIXES:
* Fix for incorrect handling of -x and -specs from Michal Welnicki.
TESTS:
* Fix false pass in tests for -x and -specs.
distcc-2.18.2 "Bees and lavender" 2004-11-12
BUG FIXES:
* Fix problem in checking errno after connect(). Fix by Jean
Delvare and Dan Kegel.
PORTABILITY:
* Fix prototype problem causing build failure on amd64. Patch
from Andreas Jochens. (Debian #280399, #280644).
distcc-2.18.1 "Reality-based computing" 2004-11-03
BUG FIXES:
* Fix run-time warnings about gtk_tree_model_row_changed() when
built with recent versions of GTK+.
* gcc option -specs= must be run locally so that it can read the
local spec file. Reported by Chris Yeoh.
PORTABILITY:
* Fix Solaris build problem reported by Dimitri Papadopoulos.
* Fix problem with reading hosts files in DOS CRLF format.
Reported by Sebastien Perochon.
distcc-2.18 "Billionaires on stilts" 2004-10-12
BUG FIXES:
* Fix longjmp() bug that can cause distcc to crash when a timeout
elapses.
* Fix compile-time problem with dcc_trace when configured with
--enable-rfc2553. Reported by Greg Earle.
* Fix warning about warn_unused_result for older versions of gcc.
* No timeout on local preprocessing or on compilation. No
timeouts on DNS lookups other than whatever is built in to the
DNS resolver. There are timeouts on network transmission and on
opening connections.
* Remove mmap() for receive of uncompressed data, to avoid various
problems.
CHANGES:
* The --allow option is now mandatory for daemon mode. As a
security feature, distccd will refuse to run without an IP
access control list.
* conftest.* built by autoconf is always done locally, to make
configure tests faster and safer.
DOCUMENTATION:
* Better description of use with ccache.
PORTABILITY:
* Fix various warnings reported by Dimitri Papadopoulos.
* Fix Tru64 build problem reported by Gary V. Vaughan.
distcc-2.17 "Divers Alarums" 2004-07-31
FEATURES:
* Performance improvements for distccmon-gnome.
* Added timeous for connection to servers, transmission of jobs
and remote compilation. If the timeout expires, the job is run
locally. This should make distcc cope better if some or all of
the servers are unreachable or failing.
* Also add timeouts in server to kick out stalled or disconnected
clients.
BUG FIXES:
* If remote compilation fails because of a signal in a later phase
of the compilation causing an exit with code >=128, retry
compilation locally. Patch from Jakub Stachowski.
DOCUMENTATION:
* Manpage fix from Jean Delvare.
PORTABILITY:
* Cygwin portability fix for WCOREDUMP, reported by Eric Frias.
distcc-2.16 "Salt" 2004-07-08
SECURITY:
* Fix bug that might cause IP-based access control rules not to be
interpreted correctly on 64-bit platforms. (CAN-2004-0601)
BUG FIXES:
* Fix small memory leaks in distccmon-gnome and distccmon-text.
FEATURES:
* Use a GNOME status bar with a grab handle for distccmon-gnome.
Patch from Nathan Fredrickson.
PORTABILITY:
* Better detection of systems with a popt library installed but
no popt.h. Reported by Sean Kelly.
* Fix bug in reporting crashed daemon children that showed up on
systems without strsignal, such as Mac OS 10.2. Reported by
Benjamin Reed.
* Update testdistcc.py to work on ia64 linux.
INTERNAL:
* Simplify dcc_log_child_exited.
* Include copyright and licence in --version output, as suggested
by GNU programs.
distcc-2.15 "feel good for ten seconds" 2004-07-06
BUG FIXES:
* Fix crash bug in receiving LZO compressed data into a mmapped
file. Reported by Arkadiusz Miskiewicz.
* Remove redundant temporary file cleanup in non-forking mode.
FEATURES:
* Client calculates and can display the overall throughput in
preprocessed bytes per second for remote jobs.
REMOVALS:
* The deprecated fork-after-exec mode controlled by the
--no-prefork option has been removed.
* mmap is no longer used for compressed data to simplify the code.
PORTABILITY:
* Additional fixes to Red Hat / Fedora scripts, by Colins Walters.
INTERNAL:
* Daemon now chdirs to $TMPDIR at startup rather than /. This
allows dumping core, among other things.
distcc-2.14 "Lake Albina" 2004-05-02
FEATURES:
* The host file is looked up in $DISTCC_DIR/hosts, not hardcoded
to ~/.distcc/hosts. The default for $DISTCC_DIR is still
~/.distcc. Suggested by Sebastien Perochon.
* Source file name is included in success/failure messages, e.g.
distcc[6655] ERROR: compile ./cases/bad.c on cardhu failed
* distcc can now be built with a build directory separate from the
source directory. Patch from Dennis Henriksen.
* Added --randomize option to host list to help spread the load
across large shared clusters. From patch by Google
(Josh Hyman <[email protected]>).
DOCUMENTATION:
* Add documentation of DISTCC_DIR, and other fixes. Patch from
Thomas Schwinge.
* Slightly improved distcc --help.
BUG FIXES:
* Decompression buffer can dynamically resize to allow for very
gassy files. From a patch by Joe Buehler.
PORTABILITY:
* Add sample scripts for Red Hat / Fedora, by Colin Walters.
* mmap is always disabled on HP-UX, because the inconsistent page
case is a bit dangerous for the way distcc uses mmap. Suggested
by Joe Buehler.
distcc-2.13 "Carnal Bunt" 2004-03-02
SECURITY:
* Enforce IPv4 access control lists when the daemon is listening
on an IPv6 port. This only applies when the server was compiled
using --enable-rfc2553 and run with --allow.
FEATURES:
* Hash comments are allowed in host list files.
INTERNAL:
* Use TCP_DEFER_ACCEPT on Linux to avoid some wasted context
switching when a new connection comes in to the server.
BUG FIXES:
* Some fixes for connections over SSH when built using
--enable-rfc2553. Reported by Jeff Rizzo.
* Handle arguments like "-xcpp" and "-Wa,-xarch=v8". Suggested by
Ben Scarlet.
* Fix resource exhaustion when DISTCC_SAVE_TEMPS is set. Reported
by Mark DeGeorge.
* Fix problems in running IPv6-enabled builds on kernels without
IPv6 support. Reported by Lisa Seelye.
DOCUMENTATION:
* More instructions for distributors/packagers.
PORTABILITY:
* Many portability patches from Albert Chin. These patches were
tested on: AIX 4.3.2, 5.1; HP-UX 10.20, 11.00, 11i; IRIX 6.5;
Redhat Linux 7.1, 9; Solaris 2.5.1, 2.6, 7, 8, 9; Tru64 UNIX
4.0D, 5.1.
* Possibly fix mmap problem on HP-UX with compressed transfers.
Reported by Joe Buehler.
TESTING:
* Add test for compilation with compression.
* Testsuite portability patch from Albert Chin. The tests pass
on: HP-UX 10.20, 11.00, 11i; IRIX 6.5; Redhat Linux7.1, 9;
Solaris 7, 8, 9; Tru64 UNIX 4.0d, 5.1.
distcc-2.12.1 "Shatner's Bassoon" 2004-01-09
BUG FIXES:
* When checking if a process exists, accept EPERM as indicating it
exists but isn't ours. This allows watching the directory of a
different user, subject only to filesystem permissions.
Reported by Ernst Bachmann.
* Correct a bug introduced in 2.12 that made distccd fail to start
when run by root because setgid failed. Fix from Wayne Davison.
* --without-gnome, --without-gtk now turn those options off rather
than on.
DOCUMENTATION:
* New man page for distccmon-text, by Shri Shrikumar and Martin
Pool.
distcc-2.12 "Figgy Pudding" 2003-12-19
FEATURES:
* New --log-level feature allows logging of only errors rather
than messages for each connection.
* IPv6 support now works better when distcc is configured with
--enable-rfc2553. The server can normally accept either IPv4 or
IPv6 connections.
* New --with-docdir configure option to set install location for
documents. The default is the same as previously. Patch from
Harold L Hunt II.
INTERNAL:
* GNU-style ChangeLog is now included in the package. Please keep
it up to date if you make your own changes!
PORTABILITY:
* setgroups() was broken by Mac OS X Panther so that it will not
accept setgroups(0, NULL) to clear the group list. Instead we
now set the group list to our single primary gid. Suggestion
from Wayne Davison.
* sendfile problems on FreeBSD 4.9-RC fixed. Patch from Allan
Saddi.
* MAXPATHLEN is provided if it's not defined, which is the case on
GNU Hurd. Reported by Santiago Vila as Debian #219600.
BUG FIXES:
* Check pkg-config information GNOME/GTK+ is now checked at
configure time, not build time. This is a bit quicker than
running the script for every file we build, and means that
PKG_CONFIG_PATH only needs to be set for configure.
DOCUMENTATION:
* Small documentation corrections.
distcc-2.11.2 "Muscovado" 2003-10-23
BUG FIXES:
* Correct the handling of --without-gnome. Reported by Dimitri
Papadopoulos.
* Fatal signal handlers for client and daemon should reset the
signal vector before doing anything else, to protect against an
(unlikely) spin if the signal is re-sent.
* Corrections to .desktop file from Dag Wieers.
INTERNAL:
* Remove dependency on libglade for GTK+ and GNOME monitor
programs.
PORTABILITY:
* IRIX portability fixes from Dimitri Papadopoulos.
* Use AC_TYPE_SIGNAL to generate correct signal handler return
types. (It can be either int or void.)
DOCUMENTATION:
* Various manual updates.
* Update to xinetd example from Dag Wieers.
distcc-2.11.1 "Burnt sugar" 2003-10-08
FEATURES:
* The graphical monitor can now be configured with either
--with-gnome or --with-gtk. In the second case, the GNOME
libraries are not used. In both cases the resulting program is
called distccmon-gnome and the functional differences are fairly
small.
BUG FIXES:
* An error message is emitted and compilation fails if distcc
cannot use the specified TMPDIR. This can happen if distccd is
started by root with a TMPDIR only accessible to root.
Reported by Brett Dikeman.
* GNOME data files are now only installed when the application is
configured with --with-gnome or --with-gtk. Files are installed
into a distcc/ subdirectory of the configured data directory.
(By default this is /usr/local/share/distcc/). Reported by Erik
Jan Tromp and Noe`l Ko"the.
* Fix bug in sending compressed files where errors were ignored.
* C++ compilation using -frepo must be local. Reported by Andrew
Slater.
PORTABILITY:
* Don't use stdint.h, which is not available on FreeBSD 4-STABLE,
IRIX or Solaris. Reported by Frerich Raabe.
DOCUMENTATION:
* Corrections to distcc manpage reported by Lionel Sausin.
* Documentation of how to write monitor programs, from Frerich
Raabe.
INTERNAL:
* Fix state.h for use with C++. Patch from Frerich Raabe.
distcc-2.11 "Sugar fix" 2003-09-23
INCOMPATIBILITIES:
* The GNOME monitor is now configured using --with-gnome (not
--enable-gnome) to be more consistent with GNU standards.
* The state file format has changed, so old distcc monitor
programs will not see new compiler processes and vice versa.
FEATURES:
* Nice new GNOME monitor, showing strip-charts (or "scarves") of
the state of each processor slot over time.
* --allow 0.0.0.0/0 is accepted as meaning "allow access from
anywhere". Debian #207831, suggested by Matthijs Kooijman.
BUG FIXES:
* If we fail to determine the number of CPUs on the machine,
assume it is 1. This may fix problems on exotic machines where
the detection call is almost but not quite right.
* In non-forking mode, make sure to close the accepted fd after
processing a request.
* Use "safe" LZO1 decompression for protection against program or
network errors.
* Lock and state files are created with the weakest permissions
permitted by the umask. This is intended to reduce problems
seen when $DISTCC_DIR is shared between two users, such as when
compiling as root during program installation.
* Client deletes temporary files when interrupted.
INTERNAL:
* Add debugging option DISTCC_MMAP, which can be set to 0 to
disable use of mmap for receiving files.
* New --enable-profile configure option to turn on gprof.
* Many changes to the representation of the client state to make
it easier to draw a history. State is now stored as a natively
encoded struct in a disk file, rather than using our network
protocol.
PERFORMANCE:
* Sleep only one second when blocked waiting for a CPU, to try to
reduce idle time when recovering from an overloaded period.
DOCUMENTATION:
* Document problems with "no_subtree_check" on NFS.
* The GNU Free Documentation License is no longer distributed,
because the documentation is now included under the GNU GPL.
* Document bad Makefiles or mismatched compilers as common causes
of failure.
* Describe where to put "localhost" in the host list.
PORTABILITY:
* Fixes for BSD/OS (BSDi) from Nick Amato.
* Fixes for portability issues in autogen.sh from Lisa Seelye and
Alexandre Oliva.
distcc-2.10.1 2003-08-12
BUG FIXES:
* Fix problem in "make clean" reported by Lisa Seelye.
distcc-2.10 "Hunger is the best sauce" 2003-08-11
SECURITY:
* Fix issues in temporary file handling that could allow a local
attacker to interfere with another user's distcc processes.
FEATURES:
* Daemon niceness is incremented by +5 by default. (This can be
changed by --nice.)
* The per-user configuration directory can be set by $DISTCC_DIR.
It defaults to the old value of ~/.distcc/.
* For regular compile failure, don't say "with exit code 1".
BUG FIXES:
* The server now emits warnings to the log and to the client if
its PATH is set such that it will recursively run a distcc
client. This check is done at run time for the requested
compiler name. The server's $PATH is not modified in other
ways. This may help reduce problems with finding the right
remote compiler.
PORTABILITY:
* SCO/Caldera operating systems are no longer supported due to
their recent absurd attacks against Linux and IBM.
* TMPDIR is no longer required to start with '/', so that Cygwin
paths starting with a drive letter may be used. Reported by
Heiko Elger.
DOCUMENTATION:
* Various man page updates.
INTERNAL:
* Daemon now sits in the root directory while running, not the
temporary directory.
* Temporary directory is gone. Working files are created directly
under $TMPDIR.
* Lock files and state files are stored under DISTCC_DIR, rather
than in /tmp.
TESTING:
* Test cases are more robust in choosing a daemon port number.
distcc-2.9 "Grace under pressure" 2003-07-21
FEATURES:
* Optional LZO1X compression of network traffic, to make distcc
faster on slow or overloaded networks. This is turned on by
appending ",lzo" to each host specification.
Both client and server must be updated for this to work. Old
clients and servers are supported when compression is off, which
is the default.
Compression is probably only worthwhile on networks slower than
100Mbps, but it will depend on the usual factors of CPU, network
and code complexity. Thanks to Markus F.X.J. Oberhumer for the
LZO library.
BUG FIXES:
* Handle invocations like "distcc foo.o -o foo", which can be
generated by Mozilla.
* Handle invocations like "distcc -Wa,-al=foo.lst -c foo.c", which
write an assembler listing to a file and cannot be run remotely.
* When trimming the path to avoid recursive invocations, stop as
soon as we find one non-symlink compiler. This should help
avoid the path getting trimmed down far too much on the server.
Patch from Wayne Davison.
PERFORMANCE:
* The daemon by default allows 2+NCPUS, rather than 3*NCPUS. The
two extras are to allow for some processes to be blocked on
network IO, but allowing more than two of them is probably not
useful on multiprocessor machines.
* Larger files are sent and received using memory mappings where
possible.
* Use of mmap and compression makes distcc substantially faster in
at least some cases.
DOCUMENTATION:
* Convert the documentation to a series of regular Unix manpages
for easier reference and so they can be used more easily on
diverse platforms. The Linuxdoc-SGML manual has been removed
from the distribution. Thanks to Tim Potter for review
suggestions.
TESTING:
* Add tests for new -o and -Wa,-al handling.
distcc-2.8 "Play in the traffic" 2003-07-09
FEATURES:
* Small enhancements to GNOME monitor appearance.
BUG FIXES:
* Fix problem with nonblocking IO for SSH connections that causes
a busy spin. SSH connections are now far more efficient.
Reported by Marcelo Matus.
* distccmon-text flushes output after each line, even if stdout is
not a terminal. This allows it to more easily be run in polling
mode under another program. Suggestion from Hamish Rodda.
* distccd now works properly with SSH servers that use pipes
rather than socketpairs to run the daemon. Previously it would
fail with an error when trying to write to stdin. Suggestion
from Felix Lee.
* Correctly handle invocations like "gcc -ofoo.o -c foo.c", where
the output filename is run on to the -o option. Based on a
patch from Tsutomu Yasuda.
INTERNAL:
* mon.h is now safe for inclusion in C++ programs, and protected
against multiple inclusion. Suggestion from Frédérick Forjan.
* Increased timeout for nonblocking network IO apart from
connections to 5 minutes.
PORTABILITY:
* Detect and avoid Apple gcc cpp-precomp brokenness. Patch from
Matt Watson.
* Better handling of builds on machines which do not have the
linuxdoc-sgml toolchain. Suggestion from Frerich Raabe.
DOCUMENTATION:
* Include an example xinetd configuration file from Andrew Morton.
distcc-2.7.1 "Expedition" 2003-06-25
PORTABILITY:
* distccmon-gnome now depends only on GTK+ 2.0, not on the GNOME
libraries.
* Fix for compilation of the GNOME monitor on BSD.
* Fix for compilation of the monitor on Cygwin.
distcc-2.7 "The Hard Way" 2003-06-16
FEATURES:
* Graphical compile monitor for GNOME 2.x. Configure with
--enable-gnome to build it.
PORTABILITY:
* Possible fix for compilation on HP-UX.
INTERNAL:
* Sanity check GNOME libraries during configuration if
--enable-gnome was specified.
distcc-2.6 "The Watcher in the Water" 2003-06-12
FEATURES:
* New program distccmon-text shows the state of any distcc
processes run by the current user. It can be run by hand or
read by a shell script. Should be popular with vmstat fans.
* New environment variable $UNCACHED_ERR_FD allows client errors
to be redirected from stderr to another file descriptor, so that
distcc errors are not cached by ccache. This is an improvment
because (almost?) all distcc messages are transient things such
as failure to connect to a remote host, and it is confusing to
have them cached.
(This needs a corresponding patch to ccache to set this, or for
it to be assigned to a duplicate of stderr before invoking
cccache.)
* In compilation log message, just show the basename of the file
to make it more compact.
BUG FIXES:
* If an compiler cannot be executed then try searching the path
for the basename of the compiler. This can fix cases where the
compiler is invoked with an absolute name but it is in a
different directory on the server. Patch from Paul Russell.
PORTABILITY:
* Fix build on platforms that don't have hstrerror(), such as
Solaris 2.6.
* Handle sysconf(_SC_NPROCESSORS_ONLN) returning 0 processors,
which has been observed on ARM Linux and previously threw
distccd into a spin. Patch from Sean MacLennan.
INTERNAL:
* New mon.c interface for writing compilation monitors.
* State directory name includes hostname for robustness when the
temporary directory is shared.
* Client writes out notes about its state to files that can be
watched by external monitor programs.
* Partial GNOME-based monitor interface, built when distcc is
configured with --enable-gnome.