# Copyright (c) 2001, 2002 Steven Knight # __FILE__ __REVISION__ __DATE__ __DEVELOPER__ SCons - a software construction tool Change Log RELEASE 0.10 - XXX From Derrick 'dman' Hudson: - Support Repositories on other file systems by symlinking or copying files when hard linking won't work. From Steven Knight: - Remove Python bytecode (*.pyc) files from the scons-local packages. - Have FunctionActions print a description of what they're doing (a representation of the Python call). - Fix the Install() method so that, like other actions, it prints what would have happened when the -n option is used. - Don't create duplicate source files in a BuildDir when the -n option is used. - Refactor the Scanner interface to eliminate unnecessary Scanner calls and make it easier to write efficient scanners. - Significant performance improvement from using a more efficient check, throughout the code, for whether a Node has a Builder. - Fix specifying only the source file to MultiStepBuilders such as the Program Builder. (Bug reported by Dean Bair.) - Fix an exception when building from a file with the same basename as the subdirectory in which it lives. (Bug reported by Gerard Patel.) - Fix automatic deduction of a target file name when there are multiple source files specified; the target is now deduced from just the first source file in the list. - Documentation fixes: better initial explanation of SConscript files; fix a misformatted "table" in the StaticObject explanation. From Steve Leblanc: - Add a Clean() method to support removing user-specified targets when using the -c option. From Lachlan O'Dea: - Make the Environment.get() method return None by default. From Anthony Roach: - Add SetJobs() and GetJobs() methods to allow configuration of the number of default jobs (still overridden by -j). - Convert the .sconsign file format from ASCII to a pickled Python data structure. - Error message cleanups: Made consistent the format of error messages (now all start with "scons: ***") and warning messages (now all start with "scons: warning:"). Caught more cases with the "Do not know how to build" error message. - Added support for the MinGW tool chain. RELEASE 0.09 - Thu, 5 Dec 2002 04:48:25 -0600 From Chad Austin: - Add a Prepend() method to Environments, to append values to the beginning of construction variables. From Matt Balvin: - Add long command-line support to the "lib" Tool (Microsoft library archiver), too. From Charles Crain: - Allow $$ in a string to be passed through as $. - Support file names with odd characters in them. - Add support for construction variable substition on scanner directories (in CPPPATH, F77PATH, LIBPATH, etc.). From Charles Crain and Steven Knight: - Add Repository() functionality, including the -Y option. From Steven Knight: - Fix auto-deduction of target names so that deduced targets end up in the same subdirectory as the source. - Don't remove source files specified on the command line! - Suport the Intel Fortran Compiler (ifl.exe). - Supply an error message if there are no command-line or Default() targets specified. - Fix the ASPPCOM values for the GNU assembler. (Bug reported by Brett Polivka.) - Fix an exception thrown when a Default() directory was specified when using the -U option. - Issue a warning when -c can't remove a target. - Eliminate unnecessary Scanner calls by checking for the existence of a file before scanning it. (This adds a generic hook to check an arbitrary condition before scanning.) - Add explicit messages to tell when we're "Reading SConscript files ...," "done reading SConscript files," "Building targets," and "done building targets." Add a -Q option to supress these. - Add separate $SHOBJPREFIX and $SHOBJSUFFIX construction variables (by default, the same as $OBJPREFIX and $OBJSUFFIX). - Add Make-like error messages when asked to build a source file, and before trying to build a file that doesn't have all its source files (including when an invalid drive letter is used on WIN32). - Add an scons-local-{version} package (in both .tar.gz and .zip flavors) to help people who want to ship SCons as a stand-alone build tool in their software packages. - Prevent SCons from unlinking files in certain situations when the -n option is used. - Change the name of Tool/lib.py to Tool/mslib.py. From Steven Knight and Anthony Roach: - Man page: document the fact that Builder calls return Node objects. From Steve LeBlanc: - Refactor option processing to use our own version of Greg Ward's Optik module, modified to run under Python 1.5.2. - Add a ParseConfig() command to modify an environment based on parsing output from a *-config command. From Jeff Petkau: - Fix interpretation of '#/../foo' on Win32 systems. From Anthony Roach: - Fixed use of command lines with spaces in their arguments, and use of Nodes with spaces in their string representation. - Make access and modification times of files in a BuildDir match the source file, even when hard linking isn't available. - Make -U be case insensitive on Win32 systems. - Issue a warning and continue when finding a corrupt .sconsign file. - Fix using an alias as a dependency of a target so that if one of the alias' dependencies gets rebuilt, the resulting target will, too. - Fix differently ordered targets causing unnecessary rebuilds on case insensitive systems. - Use os.system() to execute external commands whenever the "env" utility is available, which is much faster than fork()/exec(), and fixes the -j option on several platforms. - Fix use of -j with multiple targets. - Add an Options() object for friendlier accomodation of command- line arguments. - Add support for Microsoft VC++ precompiled header (.pch) files, debugger (.pdb) files, and resource (.rc) files. - Don't compute the $_CPPINCFLAGS, $_F77INCFLAGS, $_LIBFLAGS and $_LIBDIRFLAGS variables each time a command is executed, define them so they're computed only as needed. Add a new _concat function to the Environment that allows people to define their own similar variables. - Fix dependency scans when $LIBS is overridden. - Add EnsurePythonVersion() and EnsureSConsVersion() functions. - Fix the overly-verbose stack trace on ListBuilder build errors. - Add a SetContentSignatureType() function, allowing use of file timestamps instead of MD5 signatures. - Make -U and Default('source') fail gracefully. - Allow the File() and Dir() methods to take a path-name string as the starting directory, in addition to a Dir object. - Allow the command handler to be selected via the SPAWN, SHELL and ESCAPE construction variables. - Allow construction variables to be overridden when a Builder is called. From sam th: - Dynamically check for the existence of utilities with which to initialize Environments by default. RELEASE 0.08 - Mon, 15 Jul 2002 12:08:51 -0500 From Charles Crain: - Fixed a bug with relative CPPPATH dirs when using BuildDir(). (Bug reported by Bob Summerwill.) - Added a warnings framework and a --warn option to enable or disable warnings. - Make the C scanner warn users if files referenced by #include directives cannot be found and --warn=dependency is specified. - The BUILDERS construction variable should now be a dictionary that maps builder names to actions. Existing uses of lists, and the Builder name= keyword argument, generate warnings about use of deprecated features. - Removed the "shared" keyword argument from the Object and Library builders. - Added separated StaticObject, SharedObject, StaticLibrary and SharedLibrary builders. Made Object and Library synonyms for StaticObject and StaticLibrary, respectively. - Add LIBS and LIBPATH dependencies for shared libraries. - Removed support for the prefix, suffix and src_suffix arguments to Builder() to be callable functions. - Fix handling file names with multiple dots. - Allow a build directory to be outside of the SConstruct tree. - Add a FindFile() function that searches for a file node with a specified name. - Add $CPPFLAGS to the shared-object command lines for g++ and gcc. From Charles Crain and Steven Knight: - Add a "tools=" keyword argument to Environment instantiation, and a separate Tools() method, for more flexible specification of tool-specific environment changes. From Steven Knight: - Add a "platform=" keyword argument to Environment instantiation, and a separate Platform() method, for more flexible specification of platform-specific environment changes. - Updated README instructions and setup.py code to catch an installation failure from not having distutils installed. - Add descriptions to the -H help text for -D, -u and -U so people can tell them apart. - Remove the old feature of automatically splitting strings of file names on white space. - Add a dependency Scanner for native Fortran "include" statements, using a new "F77PATH" construction variable. - Fix C #include scanning to detect file names with characters like '-' in them. - Add more specific version / build output to the -v option. - Add support for the GNU as, Microsoft masm, and nasm assemblers. - Allow the "target" argument to a Builder call to be omitted, in which case the target(s) are deduced from the source file(s) and the Builder's specified suffix. - Add a tar archive builder. - Add preliminary support for the OS/2 Platform, including the icc and ilink Tools. From Jeff Petkau: - Fix --implicit-cache if the scanner returns an empty list. From Anthony Roach: - Add a "multi" keyword argument to Builder creation that specifies it's okay to call the builder multiple times for a target. - Set a "multi" on Aliases so multiple calls will append to an Alias. - Fix emitter functions' use of path names when using BuildDir or in subdirectories. - Fix --implicit-cache causing redundant rebuilds when the header file list changed. - Fix --implicit-cache when a file has no implicit dependencies and its source is generated. - Make the drive letters on Windows always be the same case, so that changes in the case of drive letters don't cause a rebuild. - Fall back to importing the SCons.TimeStamp module if the SCons.MD5 module can't be imported. - Fix interrupt handling to guarantee that a single interrupt will halt SCons both when using -j and not. - Fix .sconsign signature storage so that output files of one build can be safely used as input files to another build. - Added a --debug=time option to print SCons execution times. - Print an error message if a file can't be unlinked before being built, rather than just silently terminating the build. - Add a SideEffect() method that can be used to tell the build engine that a given file is created as a side effect of building a target. A file can be specified as a side effect of more than one build comand, in which case the commands will not be executed simultaneously. - Significant performance gains from not using our own version of the inefficient stock os.path.splitext() method, caching source suffix computation, code cleanup in MultiStepBuilder.__call__(), and replicating some logic in scons_subst(). - Add --implicit-deps-changed and --implicit-deps-unchanged options. - Add a GetLaunchDir() function. - Add a SetBuildSignatureType() function. From Zed Shaw: - Add an Append() method to Environments, to append values to construction variables. - Change the name of Update() to Replace(). Keep Update() as a deprecated synonym, at least for now. From Terrel Shumway: - Use a $PYTHON construction variable, initialized to sys.executable, when using Python to build parts of the SCons packages. - Use sys.prefix, not sys.exec_prefix, to find pdb.py. RELEASE 0.07 - Thu, 2 May 2002 13:37:16 -0500 From Chad Austin: - Changes to build SCons packages on IRIX (and other *NIces). - Don't create a directory Node when a file already exists there, and vice versa. - Add 'dirs' and 'names' keyword arguments to SConscript for easier specification of subsidiary SConscript files. From Charles Crain: - Internal cleanup of environment passing to function Actions. - Builders can now take arbitrary keyword arguments to create attributes to be passed to: command generator functions, FunctionAction functions, Builder emitter functions (below), and prefix/suffix generator functions (below). - Command generator functions can now return ANYTHING that can be converted into an Action (a function, a string, a CommandGenerator instance, even an ActionBase instance). - Actions now call get_contents() with the actual target and source nodes used for the build. - A new DictCmdGenerator class replaces CompositeBuilder to support more flexible Builder behavior internally. - Builders can now take an emitter= keyword argument. An emitter is a function that takes target, source, and env argument, then return a 2-tuple of (new sources, new targets). The emitter is called when the Builder is __call__'ed, allowing a user to modify source and target lists. - The prefix, suffix and src_suffix Builder arguments now take a callable as well a string. The callable is passed the Environment and any extra Builder keyword arguments and is expected to return the appropriate prefix or suffix. - CommandActions can now be a string, a list of command + argument strings, or a list of commands (strings or lists). - Added shared library support. The Object and Library Builders now take a "shared=1" keyword argument to specify that a shared object or shared library should be built. It is an error to try to build static objects into a shared library or vice versa. - Win32 support for .def files has been added. Added the Win32-specific construction variables $WIN32DEFPREFIX, $WIN32DEFSUFFIX, $WIN32DLLPREFIX and $WIN32IMPLIBPREFIX. When building a .dll, the new construction variable $WIN32_INSERT_DEF, controls whether the appropriately-named .def file is inserted into the target list (if not already present). A .lib file is always added to a Library build if not present in the list of targets. - ListBuilder now passes all targets to the action, not just the first. - Fix so that -c now deletes generated yacc .h files. - Builder actions and emitter functions can now be initialized, through construction variables, to things other than strings. - Make top-relative '#/dir' lookups work like '#dir'. - Fix for relative CPPPATH directories in subsidiary SConscript files (broken in 0.06). - Add a for_signature argument to command generators, so that generators that need to can return distinct values for the command signature and for executing the command. From Alex Jacques: - Create a better scons.bat file from a py2bat.py script on the Python mailing list two years ago (modeled after pl2bat.pl). From Steven Knight: - Fix so that -c -n does *not* remove the targets! - Man page: Add a hierarchical libraries + Program example. - Support long MSVC linker command lines through a builder action that writes to a temporary file and uses the magic MSVC "link @file" argument syntax if the line is longer than 2K characters. - Fix F77 command-line options on Win32 (use /Fo instead of -o). - Use the same action to build from .c (lower case) and .C (upper case) files on case-insensitive systems like Win32. - Support building a PDF file directly from a TeX or LaTeX file using pdftex or pdflatex. - Add a -x option to runtest.py to specify the script being tested. A -X option indicates it's an executable, not a script to feed to the Python interpreter. - Add a Split() function (identical to SCons.Util.argmunge()) for use in the next release, when Builders will no longer automatically split strings on white space. From Steve Leblanc: - Add the SConscriptChdir() method. From Anthony Roach: - Fix --debug=tree when used with directory targets. - Significant internal restructuring of Scanners and Taskmaster. - Added new --debug=dtree option. - Fixes for --profile option. - Performance improvement in construction variable substitution. - Implemented caching of content signatures, plus added --max-drift option to control caching. - Implemented caching of dependency signatures, enabled by new --implicit-cache option. - Added abspath construction variable modifier. - Added $SOURCE variable as a synonym for $SOURCES[0]. - Write out .sconsign files on error or interrupt so intermediate build results are saved. - Change the -U option to -D. Make a new -U that builds just the targets from the local SConscript file. - Fixed use of sys.path so Python modules can be imported from the SConscript directory. - Fix for using Aliases with the -u, -U and -D options. - Fix so that Nodes can be passed to SConscript files. From Moshe Zadka: - Changes for official Debian packaging. RELEASE 0.06 - Thu, 28 Mar 2002 01:24:29 -0600 From Charles Crain: - Fix command generators to expand construction variables. - Make FunctionAction arguments be Nodes, not strings. From Stephen Kennedy: - Performance: Use a dictionary, not a list, for a Node's parents. From Steven Knight: - Add .zip files to the packages we build. - Man page: document LIBS, fix a typo, document ARGUMENTS. - Added RANLIB and RANLIBFLAGS construction variables. Only use them in ARCOM if there's a "ranlib" program on the system. - Add a configurable CFILESUFFIX for the Builder of .l and .y files into C files. - Add a CXXFile Builder that turns .ll and .yy files into .cc files (configurable via a CXXFILESUFFIX construction variable). - Use the POSIX-standard lex -t flag, not the GNU-specific -o flag. (Bug reported by Russell Christensen.) - Fixed an exception when CPPPATH or LIBPATH is a null string. (Bug reported by Richard Kiss.) - Add a --profile=FILE option to make profiling SCons easier. - Modify the new DVI builder to create .dvi files from LaTeX (.ltx and .latex) files. - Add support for Aliases (phony targets). - Add a WhereIs() method for searching for path names to executables. - Add PDF and PostScript document builders. - Add support for compiling Fortran programs from a variety of suffixes (a la GNU Make): .f, .F, .for, .FOR, .fpp and .FPP - Support a CPPFLAGS variable on all default commands that use the C preprocessor. From Steve Leblanc: - Add support for the -U option. - Allow CPPPATH, LIBPATH and LIBS to be specified as white-space separated strings. - Add a document builder to create .dvi files from TeX (.tex) files. From Anthony Roach: - Fix: Construction variables with values of 0 were incorrectly interpolated as ''. - Support env['VAR'] to fetch construction variable values. - Man page: document Precious(). RELEASE 0.05 - Thu, 21 Feb 2002 16:50:03 -0600 From Chad Austin: - Set PROGSUFFIX to .exe under Cygwin. From Charles Crain: - Allow a library to specified as a command-line source file, not just in the LIBS construction variable. - Compensate for a bug in os.path.normpath() that returns '' for './' on WIN32. - More performance optimizations: cache #include lines from files, eliminate unnecessary calls. - If a prefix or suffix contains white space, treat the resulting concatenation as separate arguments. - Fix irregularities in the way we fetch DevStudio information from the Windows registry, and in our registry error handling. From Steven Knight: - Flush stdout after print so it intermixes correctly with stderr when redirected. - Allow Scanners to return a list of strings, and document how to write your own Scanners. - Look up implicit (scanned) dependencies relative to the directory of file being scanned. - Make writing .sconsign files more robust by first trying to write to a temp file that gets renamed. - Create all of the directories for a list of targets before trying to build any of the targets. - WIN32 portability fixes in tests. - Allow the list of variables exported to an SConscript file to be a UserList, too. - Document the overlooked LIBPATH construction variable. (Bug reported by Eicke Godehardt.) - Fix so that Ignore() ignores indirect, implicit dependencies (included files), not just direct dependencies. - Put the man page in the Debian distribution. - Run HTML docs through tidy to clean up the HTML (for Konqueror). - Add preliminary support for Unicode strings. - Efficiency: don't scan dependencies more than once during the walk of a tree. - Fix the -c option so it doesn't stop removing targets if one doesn't already exist. (Bug reported by Paul Connell.) - Fix the --debug=pdb option when run on Windows NT. (Bug reported by Paul Connell.) - Add support for the -q option. From Steve Leblanc: - Add support for the -u option. - Add .cc and .hh file suffixes to the C Scanner. From Anthony Roach: - Make the scons script return an error code on failures. - Add support for using code to generate a command to build a target. RELEASE 0.04 - Wed, 30 Jan 2002 11:09:42 -0600 From Charles Crain: - Significant performance improvements in the Node.FS and Scanner subsystems. - Fix signatures of binary files on Win32 systems. - Allow LIBS and LIBPATH to be strings, not just arrays. - Print a traceback if a Python-function builder throws an exception. From Steven Knight: - Fix using a directory as a Default(), and allow Default() to support white space in file names for strings in arrays. - Man page updates: corrected some mistakes, documented various missing Environment methods, alphabetized the construction variables and other functions, defined begin and end macros for the example sections, regularized white space separation, fixed the use of Export() in the Multiple Variants example. - Function action fixes: None is now a successful return value. Exceptions are now reported. Document function actions. - Add 'Action' and 'Scanner' to the global keywords so SConscript files can use them too. - Removed the Wrapper class between Nodes and Walkers. - Add examples using Library, LIBS, and LIBPATH. - The C Scanner now always returns a sorted list of dependencies so order changes don't cause unnecessary rebuilds. - Strip $(-$) bracketed text from command lines. Use this to surround $_INCDIRS and $_LIBDIRS so we don't rebuild in response to changes to -I or -L options. - Add the Ignore() method to ignore dependencies. - Provide an error message when a nonexistent target is specified on the command line. - Remove targets before building them, and add an Environment Precious() method to override that. - Eliminate redundant calls to the same builder when the target is a list of targets: Add a ListBuilder class that wraps Builders to handle lists atomically. Extend the Task class to support building and updating multiple targets in a single Task. Simplify the interface between Task and Taskmaster. - Add a --debug=pdb option to re-run SCons under the Python debugger. - Only compute a build signature once for each node. - Changes to our sys.path[] manipulation to support installation into an arbitrary --prefix value. From Steve Leblanc: - Add var=value command-line arguments. RELEASE 0.03 - Fri, 11 Jan 2002 01:09:30 -0600 From Charles Crain: - Performance improvements in the Node.FS and Sig.Calculator classes. - Add the InstallAs() method. - Execute commands through an external interpreter (sh, cmd.exe, or command.com) to handle redirection metacharacters. - Allow the user to supply a command handler. From Steven Knight: - Search both /usr/lib and /usr/local/lib for scons directories by adding them both to sys.path, with whichever is in sys.prefix first. - Fix interpreting strings of multiple white-space separated file names as separate file names, allowing prefixes and suffixes to be appended to each individually. - Refactor to move CompositeBuilder initialization logic from the factory wrapper to the __init__() method, and allow a Builder to have both an action and a src_builder (or array of them). - Refactor BuilderBase.__call__() to separate Node creation/lookup from initialization of the Node's builder information. - Add a CFile Builder object that supports turning lex (.l) and yacc (.y) files into .c files. - Document: variable interpretation attributes; how to propogate the user's environment variables to executed commands; how to build variants in multiple BuildDirs. - Collect String, Dict, and List type-checking in common utility routines so we can accept User{String,Dict,List}s all over. - Put the Action factory and classes into their own module. - Use one CPlusPlusAction in the Object Builder's action dictionary, instead of letting it create multiple identical instances. - Document the Install() and InstallAs() methods. From Steve Leblanc: - Require that a Builder be given a name argument, supplying a useful error message when it isn't. From Anthony Roach: - Add a "duplicate" keyword argument to BuildDir() that can be set to prevent linking/copying source files into build directories. - Add a "--debug=tree" option to print an ASCII dependency tree. - Fetch the location of the Microsoft Visual C++ compiler(s) from the Registry, instead of hard-coding the location. - Made Scanner objects take Nodes, not path names. - Have the C Scanner cache the #include file names instead of (re-)scanning the file each time it's called. - Created a separate class for parent "nodes" of file system roots, eliminating the need for separate is-parent-null checks everywhere. - Removed defined __hash__() and __cmp() methods from FS.Entry, in favor of Python's more efficient built-in identity comparisons. RELEASE 0.02 - Sun, 23 Dec 2001 19:05:09 -0600 From Charles Crain: - Added the Install(), BuildDir(), and Export() methods. - Fix the -C option by delaying setting the top of the FS tree. - Avoid putting the directory path on the libraries in the LIBS construction variable. - Added a GetBuildPath() method to return the full path to the Node for a specified string. - Fixed variable substitution in CPPPATH and LIBPATH. From Steven Knight: - Fixed the version comment in the scons.bat (the UNIX geek used # instead of @rem). - Fix to setup.py so it doesn't require a sys.argv[1] argument. - Provide make-like warning message for "command not found" and similar errors. - Added an EXAMPLES section to the man page. - Make Default() targets properly relative to their SConscript file's subdirectory. From Anthony Roach: - Documented CXXFLAGS, CXXCOM, and CPPPATH. - Fixed SCONS_LIB_DIR to work as documented. - Made Default() accept Nodes as arguments. - Changed Export() to make it easier to use. - Added the Import() and Return() methods. RELEASE 0.01 - Thu Dec 13 19:25:23 CST 2001 A brief overview of important functionality available in release 0.01: - C and C++ compilation on POSIX and Windows NT. - Automatic scanning of C/C++ source files for #include dependencies. - Support for building libraries; setting construction variables allows creation of shared libraries. - Library and C preprocessor search paths. - File changes detected using MD5 signatures. - User-definable Builder objects for building files. - User-definable Scanner objects for scanning for dependencies. - Parallel build (-j) support. - Dependency cycles detected. - Linux packages available in RPM and Debian format. - Windows installer available.