[Scons-dev] SCons 2.4.0 Released
William Blevins
wblevins001 at gmail.com
Mon Sep 21 20:06:00 EDT 2015
Never mind. I am apparently illiterate. I think I need more rest or
something.
Thanks for the hard work!
On Tue, Sep 22, 2015 at 1:02 AM, William Blevins <wblevins001 at gmail.com>
wrote:
> Looks like some of the docs refer to 2.3.6 rather than 2.4.0. I wouldn't
> release over it, but it might be something to fix for the next release(s).
>
> Can we do an announcement for CL support?
>
> V/R,
> William
>
> On Mon, Sep 21, 2015 at 7:18 PM, Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
>>
>>
>> SCons - a software construction tool
>>
>> Release Notes
>>
>>
>> This is 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.
>>
>> Please go to http://www.scons.org/download.php to get the latest
>> production
>> release of SCons.
>>
>> So that everyone using SCons can help each other learn how to use it more
>> effectively, please go to http://scons.org/lists.php#users to sign up for
>> the scons-users mailing list.
>>
>> ==============IMPORTANT NOTICE===========
>>
>> As has been pre-announced in SCons's mailing lists:
>>
>> * https://pairlist4.pair.net/pipermail/scons-users/2014-July/002734.html
>> ,
>> *
>> https://pairlist2.pair.net/pipermail/scons-dev/2014-December/002107.html
>> *
>> https://pairlist4.pair.net/pipermail/scons-users/2015-February/003454.html
>>
>> We're planning to switch the Node class to using "slots" in the core
>> sources,
>> mainly to reduce memory consumption by up to 35% in large build projects.
>>
>> This feature has been tested extensively and we don't expect any problems
>> for you.
>> However as with all major changes it would be wise to test V2.4.0 when it
>> is
>> released. Especially if you are directly using the Node class.
>>
>> =================================================================
>>
>>
>> RELEASE 2.4.0 - Mon, 21 Sep 2015 09:07:51 -0700
>>
>> Please consult the RELEASE.txt file for a summary of changes since the
>> last
>> release and consult the CHANGES.txt file for complete a list of changes
>> since last release. This announcement highlights only the important
>> changes.
>>
>> Please note the following important changes since release 2.3.6:
>> - Switch several core classes to use "slots" to reduce memory
>> usage. (PR #2180, #2178, #2198)
>>
>> Please note the following important changes since release 2.3.5:
>> - Support for Visual Studio 2015
>>
>> Please note the following important changes since release 2.3.4:
>> - Documentation fixes for libraries.xml and
>> builders-writing.xml (#2989 and #2990)
>> - Extended docs for InstallVersionedLib/SharedLibrary,
>> and added SKIP_WIN_PACKAGES argument to build script
>> bootstrap.py (PR #230, #3002).
>> - Fixed symlink support (PR #227, #2395).
>> - Updated debug-count test case (PR #229).
>> - Fixed incomplete LIBS flattening and substitution in
>> Program scanner(PR #205, #2954).
>> - Added new method rentry_exists_on_disk to Node.FS (PR #193).
>> - Fixed several D tests under the different OS.
>> - Add support for f08 file extensions for Fortran 2008 code.
>> - Show --config choices if no argument is specified (PR #202).
>> - Fixed build crash when XML toolchain isn't installed, and
>> activated compression for ZIP archives.
>> - Fix for VersionedSharedLibrary under 'sunos' platform.
>> - Fixed dll link with precompiled headers on MSVC 2012
>> - Added an 'exclude' parameter to Glob()
>> - Support for multiple cmdargs (one per variant) in VS project files.
>> - Various improvements for TempFileMunge class.
>> - Added an implementation for Visual Studio users files (PR #209).
>> - Added support for the 'PlatformToolset' tag in VS project files
>> (#2978).
>> - Added support for '-isystem' to ParseFlags.
>>
>>
>> Please note the following important changes since release 2.3.3:
>>
>> -- Fix for EnsureSConsVersion regression in 2.3.3.
>>
>> -- Fix for interactive mode with Configure contexts
>>
>> Please note the following important changes since release 2.3.2:
>>
>> -- On Windows, .def files did not work as sources to shared
>> libraries or executables, due to a regression which is
>> corrected in 2.3.3.
>>
>> Please note the following important changes since release 2.3.0:
>>
>> -- BitKeeper, CVS, Perforce, RCS, SCCS are deprecated from the
>> default toolset and will be removed from the default toolset
>> in future SCons versions to speed up SCons initialization.
>> The tools themselves continue to be supported.
>>
>> -- Support for Visual Studio 12.0Exp and 2013
>>
>> -- Revamp of D language support, focusing on D v2.
>> D v1 is now deprecated.
>>
>> -- Fixed NoClean() for multi-target builders.
>>
>> -- RPM and m4 are no longer in the default toolset on Windows.
>> Should improve startup speed.
>>
>> -- TeX fixes: -synctex=1 and cleaning auxiliary files.
>>
>> -- Fixes to the Docbook tool.
>>
>> Please note the following important changes since release 2.3.0:
>>
>> -- Fix failure to relink when LINKCOM or libs change, introduced in
>> 2.3.0.
>>
>> -- Fix MSVC defaulting TARGET_ARCH to HOST_ARCH and other MSVC
>> issues.
>>
>> -- Reduced memory consumption in large builds, which should speed
>> them up as well.
>>
>> -- Add new cyglink linker for use with cygwin.
>>
>> -- Fix leaking file handles to subprocesses
>>
>> -- Support read-only cache (--cache-readonly)
>>
>> -- Add Pseudo command to mark targets that shouldn't exist after
>> building
>>
>> Please note the following important changes since release 2.2.0:
>>
>> -- SUPPORT FOR PYTHON VERSIONS BEFORE 2.7 IS NOW DEPRECATED
>>
>> ***IMPORTANT***: This release is the last version of SCons to
>> support
>> Python versions older than 2.7. This release will warn if you are
>> running on Python 2.6 or older; future releases will probably not
>> work at all, as we are moving toward supporting Python 3.
>> Use --warn=no-python-version to suppress the warning if needed.
>>
>> -- A lot of python pre-2.4 compatibility code was removed
>> in this release. 2.4 is the official floor for SCons,
>> but this release will likely enforce it more rigidly.
>>
>> -- Spawning subprocesses on Windows should now be more reliable with
>> -jN
>>
>> -- MSVC10 and MSVC11 support improved, and fixed MSVS11 solution
>> generation.
>>
>> -- Various TeX/LaTeX builder improvements
>>
>> -- Support for versioned shared libs on Linux and Mac, via
>> SHLIBVERSION and InstallVersionedLib.
>>
>> -- WiX builder updates
>>
>> Please note the following important changes since release 2.1.0:
>>
>> -- New gettext toolset for internationalization
>>
>> -- Support for Visual Studio 11
>>
>> -- Support for Intel C/C++ compiler v12 on Linux and Mac
>>
>> -- LaTeX support for multibib, biblatex and biber
>>
>> Please note the following important changes since release 2.0.0:
>>
>> -- Support for Windows manifest generation
>>
>> -- SCons now searches sitewide dirs for site_scons
>>
>> -- Support for Latex bibunits package has been added along with
>> support for tex files generated by other builders
>>
>>
>> Please note the following important changes since release 1.3.0:
>>
>> -- SUPPORT FOR PYTHON VERSIONS PRIOR TO 2.4 HAS BEEN REMOVED
>>
>> Although SCons is still tested with Python 2.3, use of Python
>> versions prior to 2.4 is deprecated.
>>
>> -- DEPRECATED FEATURES WILL GENERATE MANDATORY WARNINGS IN 2.0.0
>>
>> In keeping with our deprecation cycle, the following deprecated
>> features will still be supported in 2.0.0 but will generate
>> mandatory, non-disableable warnings:
>>
>> -- The overrides= keyword argument to the Builder() call.
>> -- The scanner= keyword argument to the Builder() call.
>> -- The BuildDir() function and env.BuildDir() method.
>> -- The env.Copy() method.
>> -- The SourceSignatures() function and
>> env.SourceSignatures() method.
>> -- The TargetSignatures() function and
>> env.TargetSignatures() method.
>> -- The Sig module (now an unnused stub).
>> -- The --debug=dtree, --debug=stree and --debug=tree options.
>> -- The --debug=nomemoizer option.
>> -- The Options object and the related BoolOption(),
>> EnumOption(), ListOption(), PackageOption() and
>> PathOption() functions.
>>
>> The mandatory warnings will be issued in order to make sure
>> users of 1.3.0 notice *prior* to the release of SCons 2.0.0, that
>> these features will be removed. In SCons 2.0.0 these features
>> will no longer work at all, and will instead generate specific
>> fatal errors when anyone tries to use them.
>>
>> Please note the following important changes since release 1.2.0:
>>
>> -- MICROSOFT VISUAL STUDIO VERSION/ARCH DETECTION HAS CHANGED
>>
>> The way SCons detects Visual Studio on Windows has changed in
>> 1.3. By default, it should now use the latest installed
>> Visual Studio version on your machine, and compile for 32 or
>> 64 bits according to whether your OS is 32 or 64 bits (32/64
>> bit Python makes no difference).
>>
>> Two new variables control Visual Studio: MSVC_VERSION and
>> TARGET_ARCH. These variables ONLY take effect when passed to
>> the Environment() constructor; setting them later has no
>> effect. To use a non-default Visual Studio version, set
>> MSVC_VERSION to e.g. "8.0" or "7.1". Setting it to "xxx" (or
>> any nonexistent value) will make it print out the valid
>> versions on your system. To use a non-default architecture,
>> set TARGET_ARCH to "x86" or "x86_64" (various synonyms are
>> accepted).
>>
>> Note that if you use MSVS_VERSION to build Visual Studio
>> projects from your SConstructs, MSVS_VERSION must be set to
>> the same version as MSVC_VERSION.
>>
>> Support for HOST_OS,HOST_ARCH,TARGET_OS, TARGET_ARCH has been
>> added to allow specifying different target arch than the host
>> system. This is only supported for Visual Studio/Visual C++
>> at this time.
>>
>> -- Support for Latex glossaries and acronyms has been added
>>
>> -- VISUAL C/C++ PRECOMPILED HEADERS WILL BE REBUILT
>>
>> Precompiled header files built with Visual C/C++ will be
>> rebuilt after upgrading from 1.2.0 to a later release.
>>
>> This rebuild is normal and will occur because the command line
>> defined by the $PCHCOM construction variable has had the $CCFLAGS
>> variable added, and has been rearranged to put the "/Fo" output
>> flag towards the beginning of the line, consistent with the
>> related command lines for $CCCOM, $CXXCOM, etc.
>>
>> -- CHANGES TO SOME LINKER COMMAND LINES WILL CAUSE RELINKING
>>
>> Changes to the command line definitions for the Microsoft link.exe
>> linker, the OS/2 ilink linker and the Phar Lap linkloc linker
>> will cause targets built with those tools be to be rebuilt after
>> upgrading from 1.2.0 to a later release.
>>
>> This relink is normal and will occur because the command lines for
>> these tools have been redefined to remove unnecessary nested $(
>> and $) character strings.
>>
>> -- MSVS_USE_MFC_DIRS and MSVS_IGNORE_IDE_PATHS are obsoleted and
>> have no effect.
>>
>> Please note the following important changes since release 1.1.0:
>>
>> -- THE $CHANGED_SOURCES, $CHANGED_TARGETS, $UNCHANGED_SOURCES
>> AND $UNCHANGED_TARGETS VARIABLES WILL BECOME RESERVED
>>
>> A future release (probably 1.3.0) will make the construction
>> variable names $CHANGED_SOURCES, $CHANGED_TARGETS,
>> $UNCHANGED_SOURCES and $UNCHANGED_TARGETS into reserved
>> construction variable names controlled by SCons itself (like
>> the current $SOURCE, $TARGETS, etc.).
>>
>> Setting these variable names in the current release will generate
>> a warning but still set the variables. When they become reserved
>> variable names, they will generate a different warning message
>> and attempts to set these variables will be ignored.
>>
>> SCons configurations that happen to use these variable names
>> should be changed to use different variable names, in order
>> to ensure that the configuration continues to work with future
>> versions of SCons.
>>
>> -- THE Options OBJECT AND RELATED FUNCTIONS NOW GENERATE WARNINGS
>>
>> Use of the Options object, and related functions BoolOption(),
>> EnumOption(), ListOption(), PackageOption() and PathOption()
>> were announced as deprecated in release 0.98.1. Since then,
>> however, no warning messages were ever implemented for the
>> use of these deprecated functions.
>>
>> By default, release 1.2.0 prints warning messages when these
>> deprecated features are used. Warnings about all deprecated
>> features may be suppressed by using the --warn=no-deprecated
>> command-line option:
>>
>> $ scons --warn=no-deprecated
>>
>> Or by using the appropriate SetOption() call in any SConscript
>> file:
>>
>> SetOption('warn', 'no-deprecated')
>>
>> You may optionally disable just warnings about the deprecation
>> of the Options object and its related functions as follows:
>>
>> SetOption('warn', 'no-deprecated-options')
>>
>> The current plan is for these warnings to become mandatory
>> (non-suppressible) in release 1.3.0, and for the use of Options
>> and its related functions to generate errors in release 2.0.
>>
>> Please note the following important changes since release 0.98.4:
>>
>> -- scons.bat NOW RETURNS THE REAL SCONS EXIT STATUS
>>
>> The scons.bat script shipped with SCons used to exit with
>> a status of 1 when it detected any failed (non-zero) exit
>> status from the underlying Python execution of SCons itself.
>> The scons.bat script now exits with the actual status
>> returned by SCons.
>>
>> -- SCONS NOW WARNS WHEN TRYING TO LINK C++ AND FORTRAN OBJECT FILES
>>
>> Some C++ toolchains do not understand Fortran runtimes and create
>> unpredictable executables when linking C++ and Fortran object
>> files together. SCons now issues a warning if you try to link
>> C++ and Fortran object files into the same executable:
>>
>> scons: warning: Using $CXX to link Fortran and C++ code
>> together.
>> This may generate a buggy executable if the
>> '/usr/bin/gcc'
>> compiler does not know how to deal with Fortran
>> runtimes.
>>
>> The warning may be suppressed with either the --warning=no-link
>> or --warning=no-fortran-cxx-mix command line options, or by
>> adding either of the following lines to a SConscript file:
>>
>> SetOption('warn', 'no-link')
>> SetOption('warn', 'no-fortran-cxx-mix')
>>
>> Please note the following important changes since release 0.98:
>>
>> -- SCONS NO LONGER SETS THE GNU TOOLCHAIN -fPIC FLAG IN $SHCXXFLAGS
>>
>> The GNU toolchain support in previous versions of SCons would
>> add the -fPIC flag to the $SHCXXFLAGS construction variable.
>> The -fPIC flag has now been removed from the default
>> $SHCXXFLAGS setting. Instead, the $SHCXXCOM construction variable
>> (the default SCons command line for compiling shared objects
>> from C++ source files) has been changed to add the $SHCCFLAGS
>> variable, which contains the -fPIC flag.
>>
>> This change was made in order to make the behavior of the default
>> C++ compilation line including $SHCCFLAGS consistent with the
>> default C compilation line including $CCFLAGS.
>>
>> This change should have no impact on configurations that use
>> the default $SHCXXCOM command line. It may have an impact on
>> configurations that were using the default $SHCXXFLAGS value
>> *without* the $SHCCFLAGS variable to get the -fPIC flag into a
>> custom command line. You can fix these by adding the $SHCCFLAGS
>> to the custom command line.
>>
>> Adding $SHCCFLAGS is backwards compatible with older SCons
>> releases, although it might cause the -fPIC flag to be repeated
>> on the command line if you execute it on an older version of
>> SCons that sets -fPIC in both the $SHCCLAFGS and $SHCXXFLAGS
>> variables. Duplicating the -fPIC flag on the g++ command line
>> will not cause any compilation problems, but the change to the
>> command line may cause SCons to rebuild object files.
>>
>> -- FORTRAN NOW COMPILES .f FILES WITH gfortran BY DEFAULT
>>
>> The Fortran Tool modules have had a major overhaul with the intent
>> of making them work as-is for most configurations. In general,
>> most configurations that use default settings should not see
>> any noticeable difference.
>>
>> One configuration that has changed is if you have both a gfortran
>> and g77 compiler installed. In this case, previous versions of
>> SCons would, by default, use g77 by default to compile files with
>> a .f suffix, while SCons 0.98.1 will use the gfortran compiler
>> by default. The old behavior may be preserved by explicitly
>> initializing construction environments with the 'g77' Tool module:
>>
>> env = Environment(tools = ['g77', 'default'])
>>
>> The above code is backwards compatible to older versions of SCons.
>>
>> If you notice any other changes in the behavior of default
>> Fortran support, please let us know so we can document them in
>> these release notes for other users.
>>
>> Please note the following important changes since release
>> 0.97.0d20071212:
>>
>> -- SUPPORT FOR PYTHON VERSIONS BEFORE 2.2 IS NOW DEPRECATED
>>
>> SCons now prints the following warning when it is run by any
>> Python 1.5, 2.0 or 2.1 release or sub-release:
>>
>> scons: warning: Support for pre-2.2 Python (VERSION) is
>> deprecated.
>> If this will cause hardship, contact scons-dev at scons.org
>>
>> You may disable all warnings about deprecated features by adding
>> the option "--warn=no-deprecated" to the command line or to the
>> $SCONSFLAGS environment variable:
>>
>> $ scons --warn=no-deprecated
>>
>> Using '--warn=no-deprecated' is compatible with earlier versions
>> of SCons.
>>
>> You may also, as of this version of SCons, disable all warnings
>> about deprecated features by adding the following to any
>> SConscript file:
>>
>> SetOption('warn', 'no-deprecated')
>>
>> You may disable only the specific warning about running under
>> a deprecated Python version by adding the following to any
>> SConscript file:
>>
>> SetOption('warn', 'no-python-version')
>>
>> The warning may also be suppressed on the command line:
>>
>> $ scons --warn=no-python-version
>>
>> Or by specifying the --warn=no-python-version option in the
>> $SCONSFLAGS environment variable.
>>
>> Using SetOption('warn', ...), and the 'no-python-version'
>> command-line option for suppressing this specific warning,
>> are *not* backwards-compatible to earlier versions of SCons.
>>
>> -- THE env.Copy() METHOD IS NOW OFFICIALLY DEPRECATED
>>
>> The env.Copy() method is now officially deprecated and will
>> be removed in a future release. Using the env.Copy() method
>> now generates the following message:
>>
>> scons: warning: The env.Copy() method is deprecated; use the
>> env.Clone() method instead.
>>
>> You may disable all warnings about deprecated features by adding
>> the option "--warn=no-deprecated" to the command line or to the
>> $SCONSFLAGS environment variable:
>>
>> $ scons --warn=no-deprecated
>>
>> Using '--warn=no-deprecated' is compatible with earlier versions
>> of SCons.
>>
>> You may also, as of this version of SCons, disable all warnings
>> about deprecated features by adding the following to any
>> SConscript file:
>>
>> SetOption('warn', 'no-deprecated')
>>
>> You may disable only the specific warning about the deprecated
>> env.Copy() method by adding the following to any SConscript
>> file:
>>
>> SetOption('warn', 'no-deprecated-copy')
>>
>> The warning may also be suppressed on the command line:
>>
>> $ scons --warn=no-deprecated-copy
>>
>> Or by specifying the --warn=no-deprecated-copy option in the
>> $SCONSFLAGS environment variable.
>>
>> Using SetOption('warn', ...), and the 'no-deprecated-copy'
>> command-line option for suppressing this specific warning,
>> are *not* backwards-compatible to earlier versions of SCons.
>>
>> -- THE --debug=dtree, --debug=stree AND --debug=tree OPTIONS ARE
>> DEPRECATED
>>
>> The --debug=dtree, --debug=stree and --debug=tree methods
>> are now officially deprecated and will be removed in a
>> future release. Using these options now generate a warning
>> message recommending use of the --tree=derived, --tree=all,status
>> and --tree=all options, respectively.
>>
>> You may disable these warnings, and all warnings about
>> deprecated features, by adding the option "--warn=no-deprecated"
>> to the command line or to the $SCONSFLAGS environment
>> variable:
>>
>> $ scons --warn=no-deprecated
>>
>> Using '--warn=no-deprecated' is compatible with earlier versions
>> of SCons.
>>
>> -- THE TargetSignatures() AND SourceSignatures() FUNCTIONS ARE
>> DEPRECATED
>>
>> The TargetSignatures() and SourceSignatures() functions,
>> and their corresponding env.TargetSignatures() and
>> env.SourceSignatures() methods, are now officially deprecated
>> and will be be removed in a future release. Using ahy of
>> these functions or methods now generates a message
>> similar to the following:
>>
>> scons: warning: The env.TargetSignatures() method is
>> deprecated;
>> convert your build to use the env.Decider() method
>> instead.
>>
>> You may disable all warnings about deprecated features by adding
>> the option "--warn=no-deprecated" to the command line or to the
>> $SCONSFLAGS environment variable:
>>
>> $ scons --warn=no-deprecated
>>
>> Using '--warn=no-deprecated' is compatible with earlier versions
>> of SCons.
>>
>> You may also, as of this version of SCons, disable all warnings
>> about deprecated features by adding the following to any
>> SConscript file:
>>
>> SetOption('warn', 'no-deprecated')
>>
>> You may disable only the specific warning about the use of
>> TargetSignatures() or SourceSignatures() by adding the
>> following to any SConscript file:
>>
>> SetOption('warn', 'no-deprecated-target-signatures')
>> SetOption('warn', 'no-deprecated-source-signatures')
>>
>> The warnings may also be suppressed on the command line:
>>
>> $ scons --warn=no-deprecated-target-signatures
>> --warn=no-deprecated-source-signatures
>>
>> Or by specifying these options in the $SCONSFLAGS environment
>> variable.
>>
>> Using SetOption('warn', ...), or the command-line options
>> for suppressing these warnings, is *not* backwards-compatible
>> to earlier versions of SCons.
>>
>> -- File(), Dir() and Entry() NOW RETURN A LIST WHEN THE INPUT IS A
>> SEQUENCE
>>
>> Previously, if these methods were passed a list, the list was
>> substituted and stringified, then passed as a single string to
>> create a File/Dir/Entry Node. This rarely if ever worked with
>> more than one element in the list. They now return a list of
>> Nodes when passed a list.
>>
>> One case that works differently now is a passing in a
>> single-element sequence; that formerly was stringified
>> (returning its only element) and then a single Node would be
>> returned. Now a single-element list containing the Node will
>> be returned, for consistency.
>>
>> -- THE env.subst() METHOD NOW RETURNS A LIST WHEN THE INPUT IS A
>> SEQUENCE
>>
>> The env.subst() method now returns a list with the elements
>> expanded when given a list as input. Previously, the env.subst()
>> method would always turn its result into a string.
>>
>> This behavior was changed because it interfered with being able
>> to include things like lists within the expansion of variables
>> like $CPPPATH and then have SCons understand that the elements
>> of the "internal" lists still needed to be treated separately.
>> This would cause a $CPPPATH list like ['subdir1', 'subdir']
>> to show up in a command line as "-Isubdir1 subdir".
>>
>> -- THE Jar() BUILDER NOW USES THE Java() BUILDER CLASSDIR BY DEFAULT
>>
>> By default, the Jar() Builder will now use the class directory
>> specified when the Java() builder is called. So the following
>> input:
>>
>> classes = env.Java('classes', 'src')
>> env.Jar('out.jar', classes)
>>
>> Will cause "-C classes" to be passed the "jar" command invocation,
>> and the Java classes in the "out.jar" file will not be prefixed
>> "classes/".
>>
>> Explicitly setting the $JARCHDIR variable overrides this default
>> behavior. The old behavior of not passing any -C option to the
>> "jar" command can be preserved by explicitly setting $JARCHDIR
>> to None:
>>
>> env = Environment(JARCHDIR = None)
>>
>> The above setting is compatible with older versions of SCons.
>>
>> Please note the following important changes since release
>> 0.97.0d20070918:
>>
>> -- SCons REDEFINES PYTHON open() AND file() ON Windows TO NOT PASS
>> ON OPEN FILE HANDLES TO CREATED PROCESSES
>>
>> On Windows systems, SCons now redefines the Python open()
>> and file() functions so that, if the Python Win32 extensions
>> are available, the file handles for any opened files will *not*
>> be inherited by subprocesses, such as the spawned compilers and
>> other tools invoked to build the software.
>>
>> This prevents certain race conditions where a file handle for
>> a file opened by Python (either in a Python function action,
>> or directly in a SConscript file) could be inherited and help
>> open by a subprocess, interfering with the ability of other
>> processes to create or modify the file.
>>
>> In general, this should not cause problems for the vast majority
>> of configurations. The only time this would be a problem would be
>> in the unlikely event that a process spawned by SCons specifically
>> *expected* to use an inherited file handle opened by SCons.
>>
>> If the Python Win32 extensions are not installed or are an
>> earlier version that does not have the ability to disable file
>> handle inheritance, SCons will print a warning message when the
>> -j option is used. The warning message may be suppressed by
>> specifying --warn=no-parallel-support.
>>
>> Please note the following important changes since release
>> 0.97.0d20070809:
>>
>> -- "content" SIGNATURES ARE NOW THE DEFAULT BEHAVIOR
>>
>> The default behavior of SCons is now to use the MD5 checksum of
>> all file contents to decide if any files have changed and should
>> cause rebuilds of their source files. This means that SCons may
>> decide not to rebuild "downstream" targets if a a given input
>> file is rebuilt to the exact same contents as the last time.
>> The old behavior may preserved by explicity specifying:
>>
>> TargetSignatures("build")
>>
>> In any of your SConscript files.
>>
>> -- TARGETS NOW IMPLICITLY DEPEND ON THE COMMAND THAT BUILDS THEM
>>
>> For all targets built by calling external commands (such as a
>> compiler or other utility), SCons now adds an implicit dependency
>> on the command(s) used to build the target.
>>
>> This will cause rebuilds of all targets built by external commands
>> when running SCons in a tree built by previous version of SCons,
>> in order to update the recorded signatures.
>>
>> The old behavior of not having targets depend on the external
>> commands that build them can be preserved by setting a new
>> $IMPLICIT_COMMAND_DEPENDENCIES construction variable to a
>> non-True value:
>>
>> env = Environment(IMPLICIT_COMMAND_DEPENDENCIES = 0)
>>
>> or by adding Ignore() calls for any targets where the behavior
>> is desired:
>>
>> Ignore('/usr/bin/gcc', 'foo.o')
>>
>> Both of these settings are compatible with older versions
>> of SCons.
>>
>> -- CHANGING SourceSignature() MAY CAUSE "UNECESSARY" REBUILDS
>>
>> If you change the SourceSignature() value from 'timestamp' to
>> 'MD5', SCons will now rebuild targets that were already up-to-date
>> with respect to their source files.
>>
>> This will happen because SCons did not record the content
>> signatures of the input source files when the target was last
>> built--it only recorded the timestamps--and it must record them
>> to make sure the signature information is correct. However,
>> the content of source files may have changed since the last
>> timestamp build was performed, and SCons would not have any way to
>> verify that. (It would have had to open up the file and record
>> a content signature, which is one of the things you're trying to
>> avoid by specifying use of timestamps....) So in order to make
>> sure the built targets reflect the contents of the source files,
>> the targets must be rebuilt.
>>
>> Change the SourceSignature() value from 'MD5' to 'timestamp'
>> should correctly not rebuild target files, because the timestamp
>> of the files is always recorded.
>>
>> In previous versions of SCons, changing the SourceSignature()
>> value would lead to unpredictable behavior, usually including
>> rebuilding targets.
>>
>> -- THE Return() FUNCTION NOW ACTUALLY RETURNS IMMEDIATELY
>>
>> The Return() function now immediately stops processing the
>> SConscript file in which it appears and returns the values of the
>> variables named in its arguments. It used to continue processing
>> the rest of the SConscript file, and then return the values of the
>> specified variables at the point the Return() function was called.
>>
>> The old behavior may be requested by adding a "stop=False"
>> keyword argument to the Return() call:
>>
>> Return('value', stop=False)
>>
>> The "stop=" keyword argument is *not* compatible with SCons
>> versions 0.97.0d20070809 or earlier.
>>
>> Please note the following important changes since release 0.97:
>>
>> -- env.CacheDir() NOW ONLY AFFECTS CONSTRUCTION ENVIRONMENT TARGETS
>>
>> The env.CacheDir() method now only causes derived files to be
>> retrieved from the specified cache directory for targets built
>> with the specified specified construction environment ("env").
>>
>> Previously, any call to env.CacheDir() or CacheDir() would modify
>> a global setting and cause all built targets to be retrieved
>> from the specified cache directory. This behavior was changed so
>> that env.CacheDir() would be consistent with other construction
>> environment methods, which only affect targets built with the
>> specified construction environment.
>>
>> The old behavior of changing the global behavior may be preserved
>> by changing any env.CacheDir() calls to:
>>
>> CacheDir('/path/to/cache/directory')
>>
>> The above change is backwards-compatible and works in all earlier
>> versions of SCons that support CacheDir().
>>
>> -- INTERPRETATION OF SUFFIX-LESS SOURCE ARGUMENTS HAS CHANGED
>>
>> The interpretation of source arguments (files) without suffixes
>> has changed in one specific configuration.
>>
>> Previously, if a Builder had a src_suffix specified (indicating
>> that source files without suffixes should have that suffix
>> appended), the suffix would only be applied to suffix-less source
>> arguments if the Builder did *not* have one or more attached
>> source Builders (that is, the Builder was not a "multi-stage"
>> Builder). So in the following configuration:
>>
>> build_foo = Builder(src_suffix = '.foo')
>> build_bar = Builder(src_suffix = '.bar',
>> src_builder = build_bar)
>>
>> env = Environment(BUILDERS = {
>> 'Foo' : build_foo,
>> 'Boo' : build_bar,
>> })
>>
>> env.Foo('tgt1', 'src1')
>> env.Bar('tgt2', 'src2')
>>
>> SCons would have expected to find a source file 'src1.foo' for the
>> env.Foo() call, but a source file 'src2' for the env.Bar() call.
>>
>> This behavior has now been made consistent, so that the two
>> above calls would expect source files named 'src1.foo' and
>> 'src2.bar', respectively.
>>
>> Note that, if genuinely desired, the old behavior of building
>> from a source file without a suffix at all (when the Builder has
>> a src_suffix *and* a src_builder) can be specified explicity by
>> turning the string into a File Node directly:
>>
>> env.Bar('tgt2', File('src2'))
>>
>> The above use of File() is backwards-compatible and will work
>> on earlier versions of SCons.
>>
>> -- THE DEFAULT EXECUTION PATH FOR Solaris HAS CHANGED
>>
>> On Solaris systems, SCons now adds the "/opt/SUNWspro/bin"
>> directory to the default execution $PATH variable before the
>> "/usr/ccs/bin" directory. This was done to reflect the fact
>> that /opt/SUNWspro/ is the default for SUN tools, but it may
>> cause a different compiler to be used if you have compilers
>> installed in both directories.
>>
>> -- GENERATED config.h FILES NOW SAY "#define HAVE_{FEATURE} 1"
>>
>> When generating a "config.h" file, SCons now defines values that
>> record the existence of a feature with a "1" value:
>>
>> #define HAVE_FEATURE 1
>>
>> Instead of printing the line without a "1", as it used to:
>>
>> #define HAVE_FEATURE
>>
>> This should not cause any problems in the normal use of "#ifdef
>> HAVE_{FEATURE}" statements interpreted by a C preprocessor, but
>> might cause a compatibility issue if a script or other utility
>> looks for an exact match of the previous text.
>>
>> Please note the following planned, future changes:
>>
>> -- THE Options OBJECT AND RELATED FUNCTIONS WILL BE DEPRECATED
>>
>> The Options object is being replaced by a new Variables
>> object, which uses a new Variables.AddVariable() method
>> where the previous interface used Options.AddOptions().
>>
>> Similarly, the following utility functions are being replaced
>> by the following similarly-named functions:
>>
>> BoolOption() BoolVariable()
>> EnumOption() EnumVariable()
>> ListOption() ListVariable()
>> PackageOption() PackageVariable()
>> PathOption() PathVariable()
>>
>> And also related, the options= keyword argument when creating
>> construction environments with the Environment() functions is
>> being replaced with a variables= keyword argument.
>>
>> In some future release a deprecation warning will be added to
>> existing uses of the Options object, its methods, the above
>> utility functions, and the options= keyword argument of the
>> Environment() function. At some point after the deprecation
>> warning is added, the Options object, related functions and
>> options= keyword argument will be removed entirely.
>>
>> You can prepare for this by changing all your uses of the Options
>> object and related functions to the Variables object and the new
>> function names, and changing any uses of the options= keyword
>> argument to variables=.
>>
>> NOTE: CONVERTING TO USING THE NEW Variables OBJECT OR THE
>> RELATED *Variable() FUNCTIONS, OR USING THE NEW variable=
>> KEYWORD ARGUMENT, IS NOT BACKWARDS COMPATIBLE TO VERSIONS OF
>> SCons BEFORE 0.98. YOUR SConscript FILES WILL NOT WORK ON
>> EARLIER VERSIONS OF SCons AFTER MAKING THIS CHANGE.
>>
>> If you change SConscript files in software that you make available
>> for download or otherwise distribute, other users may try to
>> build your software with an earlier version of SCons that does
>> not have the Variables object or related *Variable() functions.
>> We recommend preparing for this in one of two ways:
>>
>> -- Make your SConscript files backwards-compatible by
>> modifying your calls with Python try:-except: blocks
>> as follows:
>>
>> try:
>> vars = Variables('custom.py', ARGUMENTS)
>> vars.AddVariables(
>> BoolVariable('WARNINGS', 'cmopile with
>> -Wall', 1),
>> EnumVariable('DEBUG', 'debug version', 'no'
>> allowed_values=('yes', 'no',
>> 'full'),
>> map={}, ignorecase=0),
>> ListVariable('SHAREDLIBS',
>> 'libraries to build shared',
>> 'all',
>> names = list_of_libs),
>> PackageVariable('X11',
>> 'use X11 from here',
>> '/usr/bin/X11'),
>> PathVariable('QTDIR', 'root of Qt', qtdir),
>> )
>> except NameError:
>> vars = Options('custom.py', ARGUMENTS)
>> vars.AddOptions(
>> BoolOption('WARNINGS', 'cmopile with -Wall',
>> 1),
>> EnumOption('DEBUG', 'debug version', 'no'
>> allowed_values=('yes', 'no',
>> 'full'),
>> map={}, ignorecase=0),
>> ListOption('SHAREDLIBS',
>> 'libraries to build shared',
>> 'all',
>> names = list_of_libs),
>> PackageOption('X11',
>> 'use X11 from here',
>> '/usr/bin/X11'),
>> PathOption('QTDIR', 'root of Qt', qtdir),
>> )
>>
>> Additionally, you can check for availability of the new
>> variables= keyword argument as follows:
>>
>> try:
>> env = Environment(variables=vars)
>> except TypeError:
>> env = Environment(options=vars)
>>
>> (Note that we plan to maintain the existing Options object
>> name for some time, to ensure backwards compatibility,
>> so in practice it may be easier to just continue to use
>> the old name until you're reasonably sure you won't have
>> people trying to build your software with versions of
>> SCons earlier than 0.98.1.)
>>
>> -- Use the EnsureSConsVersion() function to provide a
>> descriptive error message if your SConscript files
>> are executed by an earlier version of SCons:
>>
>> EnsureSConsVersion(0, 98, 1)
>>
>> -- THE BuildDir() METHOD AND FUNCTION WILL BE DEPRECATED
>>
>> The env.BuildDir() method and BuildDir() function are being
>> replaced by the new env.VariantDir() method and VariantDir()
>> function.
>>
>> In some future release a deprecation warning will be added
>> to existing uses of the env.BuildDir() method and BuildDir()
>> function. At some point after the deprecation warning, the
>> env.Builder() method and BuildDir() function will either
>> be removed entirely or have their behavior changed.
>>
>> You can prepare for this by changing all your uses of the
>> env.BuildDir() method to env.VariantDir() and uses of the
>> global BuildDir() function to VariantDir(). If you use a
>> named keyword argument of "build_dir" when calling
>> env.BuildDir() or BuildDir():
>>
>> env.BuildDir(build_dir='opt', src_dir='src')
>>
>> The keyword must be changed to "variant_dir":
>>
>> env.VariantDir(variant_dir='opt', src_dir='src')
>>
>> NOTE: CHANGING USES OF env.BuildDir() AND BuildDir() to
>> env.VariantDir() AND VariantDir() IS NOT BACKWARDS COMPATIBLE
>> TO VERSIONS OF SCons BEFORE 0.98. YOUR SConscript FILES
>> WILL NOT WORK ON EARLIER VERSIONS OF SCons AFTER MAKING
>> THIS CHANGE.
>>
>> If you change SConscript files in software that you make
>> available for download or otherwise distribute, other users
>> may try to build your software with an earlier version of
>> SCons that does not have the env.VariantDir() method or
>> VariantDir() fnction. We recommend preparing for this in
>> one of two ways:
>>
>> -- Make your SConscript files backwards-compatible by
>> including the following code near the beginning of your
>> top-level SConstruct file:
>>
>> import SCons.Environment
>> try:
>> SCons.Environment.Environment.VariantDir
>> except AttributeError:
>> SCons.Environment.Environment.VariantDir = \
>> SCons.Environment.Environment.BuildDir
>>
>> -- Use the EnsureSConsVersion() function to provide a
>> descriptive error message if your SConscript files
>> are executed by an earlier version of SCons:
>>
>> EnsureSConsVersion(0, 98)
>>
>> -- THE SConscript() "build_dir" KEYWORD ARGUMENT WILL BE DEPRECATED
>>
>> The "build_dir" keyword argument of the SConscript function
>> and env.SConscript() method are being replaced by a new
>> "variant_dir" keyword argument.
>>
>> In some future release a deprecation warning will be added
>> to existing uses of the SConscript()/env.SConscript()
>> "build_dir" keyword argument. At some point after the
>> deprecation warning, support for this keyword argument will
>> be removed entirely.
>>
>> You can prepare for this by changing all your uses of the
>> SConscript()/env.SConscript() 'build_dir" keyword argument:
>>
>> SConscript('src/SConscript', build_dir='opt')
>>
>> To use the new "variant_dir" keyword argument:
>>
>> SConscript('src/SConscript', variant_dir='opt')
>>
>> NOTE: USING THE NEW "variant_dir" KEYWORD IS NOT BACKWARDS
>> COMPATIBLE TO VERSIONS OF SCons BEFORE 0.98. YOUR SConscript
>> FILES WILL NOT WORK ON EARLIER VERSIONS OF SCons AFTER
>> MAKING THIS CHANGE.
>>
>> If you change SConscript files in software that you make
>> available for download or otherwise distribute, other users
>> may try to build your software with an earlier version of
>> SCons that does not support the "variant_dir" keyword.
>>
>> If you can insist that users use a recent version of SCons
>> that supports "variant_dir", we recommend using the
>> EnsureSConsVersion() function to provide a descriptive error
>> message if your SConscript files are executed by an earlier
>> version of SCons:
>>
>> EnsureSConsVersion(0, 98)
>>
>> If you want to make sure that your SConscript files will
>> still work with earlier versions of SCons, then your best
>> bet is to continue to use the "build_dir" keyword until the
>> support is removed (which, in all likelihood, won't happen
>> for quite some time).
>>
>> -- SCANNER NAMES HAVE BEEN DEPRECATED AND WILL BE REMOVED
>>
>> Several internal variable names in SCons.Defaults for various
>> pre-made default Scanner objects have been deprecated and will
>> be removed in a future revision. In their place are several new
>> global variable names that are now part of the publicly-supported
>> interface:
>>
>> NEW NAME DEPRECATED NAME
>> -------- ----------------------------
>> CScanner SCons.Defaults.CScan
>> DSCanner SCons.Defaults.DScan
>> SourceFileScanner SCons.Defaults.ObjSourceScan
>> ProgramScanner SCons.Defaults.ProgScan
>>
>> Of these, only ObjSourceScan was probably used at all, to add
>> new mappings of file suffixes to other scanners for use by the
>> Object() Builder. This should now be done as follows:
>>
>> SourceFileScanner.add_scanner('.x', XScanner)
>>
>> -- THE env.Copy() METHOD WILL CHANGE OR GO AWAY ENTIRELY
>>
>> The env.Copy() method (to make a copy of a construction
>> environment) is being replaced by the env.Clone() method.
>>
>> As of SCons 0.98, a deprecation warning has been added to
>> current uses of the env.Copy() method. At some point in
>> the future, the env.Copy() method will either be removed
>> entirely or have its behavior changed.
>>
>> You can prepare for this by changing all your uses of env.Copy()
>> to env.Clone(), which has the exact same calling arguments.
>>
>> NOTE: CHANGING USES OF env.Copy() TO env.Clone() WILL MAKE
>> YOUR SConscript FILES NOT WORK ON VERSIONS OF SCons BEFORE
>> 0.96.93.
>>
>> If you change SConscript files in software that you make
>> available for download or otherwise distribute, other users
>> may try to build your software with an earlier version of
>> SCons that does not have the env.Clone() method. We recommend
>> preparing for this in one of two ways:
>>
>> -- Make your SConscript files backwards-compatible by
>> including the following code near the beginning of your
>> top-level SConstruct file:
>>
>> import SCons.Environment
>> try:
>> SCons.Environment.Environment.Clone
>> except AttributeError:
>> SCons.Environment.Environment.Clone = \
>> SCons.Environment.Environment.Copy
>>
>> -- Use the EnsureSConsVersion() function to provide a
>> descriptive error message if your SConscript files
>> are executed by an earlier version of SCons:
>>
>> EnsureSConsVersion(0, 96, 93)
>>
>> -- THE CheckLib Configure TEST WILL CHANGE BEHAVIOR
>>
>> The CheckLib() Configure test appends the lib(s) to the
>> Environment's LIBS list in 1.3 and earlier. In 1.3 there is a
>> new CheckLib argument, append, which defaults to True to
>> preserve the old behavior. In a future release, append will
>> be changed to default to False, to conform with autoconf and
>> user expectations, since it is usually used to build up
>> library lists in a right-to-left way.
>>
>>
>>
>> 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 interfaces in release 1.0 will *not* be knowingly changed in
>> any new, future 1.x release. If an interface change should ever
>> become necessary due to extraordinary circumstances, the change
>> and an appropriate transition strategy will be documented in these
>> RELEASE notes.
>>
>> As you use SCons, please heed the following:
>>
>> - 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... :-)
>>
>> - The "SCons Design" documentation on the SCons web site is very
>> out of date, as we made significant changes to portions of the
>> interface as we figured out what worked and what didn't during the
>> extensive beta implementation. The "SCons Design" document should
>> be used only for historical purposes, or for just an extremely
>> general understanding of SCons' architectural goals.
>>
>> - 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 Issue Tracker
>> at tigris.org:
>>
>> http://scons.tigris.org/project_issues.html
>>
>> - 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
>> out of date. Take what you read there with a grain of salt.
>>
>> - 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.
>>
>> - 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).
>>
>> - 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.
>> You can work around this by using the SConsignFile() function
>> to collect all of the .sconsign information into a single file
>> outside of the directory being packaged by Jar().
>>
>> - 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.
>>
>> - SCons does not currently automatically check out SConstruct or
>> SConscript files from SCCS, RCS or BitKeeper.
>>
>> - 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.
>>
>> -- The SCons Development Team
>> Gary Oberbrunner and Bill Deegan, maintainers
>> Thanks to all the contributors for all your help!
>>
>> Copyright (c) 2001 - 2015 The SCons Foundation
>>
>>
>> _______________________________________________
>> Scons-dev mailing list
>> Scons-dev at scons.org
>> https://pairlist2.pair.net/mailman/listinfo/scons-dev
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist2.pair.net/pipermail/scons-dev/attachments/20150922/1b6467c8/attachment-0001.html>
More information about the Scons-dev
mailing list