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# __COPYRIGHT__
# __FILE__ __REVISION__ __DATE__ __DEVELOPER__
SCons - a software construction tool
Release Notes
This is a beta release of SCons, a tool for building software (and other
files). SCons is implemented in Python, and its "configuration files"
are actually Python scripts, allowing you to use the full power of a
real scripting language to solve build problems. You do not, however,
need to know Python to use SCons effectively.
So that everyone using SCons can help each other learn how to use it
more effectively, please sign up for the scons-users mailing list at:
http://lists.sourceforge.net/lists/listinfo/scons-users
RELEASE 0.93 - Thu, 23 Oct 2003 07:26:55 -0500
This is the fourth beta release of SCons. Please consult the
CHANGES.txt file for a list of specific changes since last release.
Please note the following important changes since release 0.92:
- Construction variables are now expanded anywhere within a
target or source name, as well as in the arguments to the following
Environment methods: AlwaysBuild(), Depends(), Ignore(), Install(),
InstallAs(), Precious(), SideEffect() and SourceCode().
If you have any files or directories that actually contain one or
more dollar signs ($), you must now precede the dollar sign with
another dollar sign ($$) when referring to the file or directory
as part of calling a Builder, or any of the above methods.
- The ParseConfig() global function has now been deprecated in favor
of using the env.ParseConfig() method. The global function will be
removed in some future release of SCons.
Please note the following important changes since release 0.91:
- The Debian package available from the SCons web site now
uses Python version 2.2.
SCons is developed with an extensive regression test suite, and a
rigorous development methodology for continually improving that suite.
Because of this, SCons is of sufficient quality that you can use it
for real work. The "beta" status of the release reflects that we
still may change interfaces in future releases, which may require
modifications to your SConscript files. We strive to hold these
changes to a minimum.
Nevertheless, please heed the following disclaimers:
- Please report any bugs or other problems that you find to our bug
tracker at our SourceForge project page:
http://sourceforge.net/tracker/?func=add&group_id=30337&atid=398971
We have a reliable bug-fixing methodology already in place and
strive to respond to problems relatively quickly.
- Documentation is spottier than we'd like. You may need to dive
into the source code to figure out how to do something. Asking
questions on the scons-users mailing list is also welcome. We
will be addressing the documentation in upcoming releases, but
would be more than glad to have your assistance in correcting this
problem... :-)
In particular, the "SCons Design" documentation on the SCons web
site is currently out of date, as we made significant changes to
portions of the interface as we figured out what worked and what
didn't during implementation.
- There may be performance issues. Improving SCons performance
is an ongoing priority. If you still find the performance
unacceptable, we would very much like to hear from you and learn
more about your configuration so we can optimize the right things.
- Error messages don't always exist where they'd be helpful.
Please let us know about any errors you ran into that would
have benefitted from a (more) descriptive message.
KNOWN PROBLEMS IN THIS RELEASE:
For a complete list of known problems, consult the SCons bug tracker
page at SourceForge:
http://sourceforge.net/tracker/?atid=398971&group_id=30337&func=browse
- Support for parallel builds (-j) does not work on WIN32 systems
prior to *official* Python release 2.2 (not 2.2 pre-releases).
Prior to Python 2.2, there is a bug in Python's Win32
implementation such that when a thread spawns an external command,
it blocks all threads from running. This breaks the SCons
multithreading architecture used to support -j builds.
We have included a patch file, os_spawnv_fix.diff, that you can
use if you you want to fix your version of Python to support
parallel builds in SCons.
- Again, the "SCons Design" documentation on the SCons web
site is currently out of date. Take what you read there with a
grain of salt.
- If a file is specified to be built in multiple ways, the last
processed builder specification overwrites all other builders,
without any warning.
- On Win32 systems, you must put a space between the redirection
characters < and >, and the specified files (or construction
variable expansions):
command < $SOURCE > $TARGET
If you don't supply a space (for example, "<$SOURCE"), SCons will
not recognize the redirection.
- People have reported problems with SCons not stopping a build when
an interrupt (CTRL+C) is received. A fix was checked in to 0.11
that should fix this behavior on many systems, but there are
issues with the underlying Python os.system() call that suggest
this fix does not work on all systems or in all circumstances.
We're working to try to find a universal solution.
- Modifying a construction environment in a subsidiary SConscript
file modifies the global environment.
- MSVC .res files are not rebuilt when icons change.
- The -c option does not clean up .sconsign files or directories
created as part of the build, and also does not clean up
SideEffect files (for example, Visual Studio .pdb files).
- Switching content signatures from "MD5" to "timestamp" and back
again can cause unusual errors. These errors can be cleared up by
removing all .sconsign files.
- On Win32, SCons does not recognize that a target specified as
(for example) \some\target is the same as X:\some\target (for your
current volume X:).
- Using a construction variable in its own expansion can cause
an infinite loop.
- Appending values to construction variables may suffer from type
errors if, for example, you try to append a string to list or
vice versa.
- When using multiple Repositories, changing the name of an include
file can cause an old version of the file to be used.
- There is currently no way to force use of a relative path (../*)
for directories outside the top-level SConstruct file.
- The Jar() Builder will, on its second or subsequent invocation,
package up the .sconsign files that SCons uses to track
signatures.
- SCons does not currently have a way to detect that an intermediate
file has been corrupted from outside and should be rebuilt.
- Unicode characters in path names do not work in all circumstances.
- A stray source file in a BuildDir can prevent targets from being
(re)built when they should.
- No support yet for the following planned command-line options:
-d -e -l --list-actions --list-derived --list-where
-o --override -p -r -R -w --write-filenames
-W --warn-undefined-variables
Thank you for your interest, and please let us know how we can help
improve SCons for your needs.
Steven Knight
knight at baldmt dot com
http://www.baldmt.com/~knight/
With plenty of help from the SCons Development team:
Chad Austin
Charles Crain
Steve Leblanc
Gary Oberbrunner
Anthony Roach
Greg Spencer
Christoph Wiedemann
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