# __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