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# __COPYRIGHT__
# __FILE__ __REVISION__ __DATE__ __DEVELOPER__
SCons - a software construction tool
Release Notes
This is an alpha 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 0.12 - XXX
This is the twelfth alpha 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 0.10:
- The default suffix for shared object files when using gcc has
now been changed to '.os'. This is to make library builds more
convenient by allowing both static (compiled without -fPIC) and
shared object files (compiled with -fPIC) to exist side-by-side.
If you want to preserve the old behavior of using .o files for
shared objects, you must now explicitly reset the SHOBJSUFFIX
value in your construction environment as follows:
env = Environment(SHOBJSUFFIX = '.o')
- The default behavior when no targets are specified has been changed
to be like Make: everything in the current directory and below will
be built. This can be disabled by specifying "Default(None)" in an
SConscript, in which case there will be no default targets and
SCons will print an appropriate error message.
- Setting the BUILDERS construction variable now properly clears
the previous Builder attributes from the construction Environment.
Before, you could initialize BUILDERS like so:
env = Environment(BUILDERS = {'NewBuilder' : foo})
And still use the canned default Builders like env.Program(),
env.Object(), env.StaticLibrary(), etc. No more. Beginning with
SCons 0.10, an initialization like that above will create an
Environment with only the env.NewBuilder() Builder.
So now, if you want to use a new builder in addition to the default
builders, you should explicitly append your new builder to the
existing ones using techniques like the following:
env.Append(BUILDERS = {'NewBuilder' : foo})
env['BUILDERS']['newbuilder'] = foo
- An "env" argument has been added to the calls to all functions that
return a string for a Python function Action. This makes the string
function and build function calls take the same arguments:
def build_it(target, source, env):
# build the target from the source
return 0
def string_it(target, source, env):
return "building '%s' from '%s'" % (target[0], source[0])
a = Action(build_it, string_it)
If you have defined a strfunction() for a Python function Action,
you will need to add a third "env" argument to your function call.
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 "alpha" 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:
- There may, of course, be bugs. 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.
- Executing the -u or -U option from a source directory that has an
associated BuildDir() does not build the targets in the BuildDir().
- Modifying a construction environment in a subsidiary SConscript
file modifies the global environment.
- PDB files on Win32 in a build that uses BuildDir() are built in
the source directory, not the build directory.
- 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.
- No support yet for the following planned command-line options:
-d -e -l --list-actions --list-derived --list-where
-o --override -p -r -R --random -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
Anthony Roach
Terrel Shumway
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