is an
Open Source software build tool. SCons is a substitute for the classic
Make utility with integrated functionality similar to
Autoconf /
Automake and compiler caches such as
Ccache . Compared to earlier tools, SCons aims to be easier to use, more reliable, and faster.
- Configuration files are Python scripts, which means that user-written builds have access to a complete general-purpose programming language.
- Automatic dependency analysis built-in for C , C++ and Fortran . Unlike make, no extra command like "make depend" or "make clean" is required to get all of the dependencies. Dependency analysis is easily extensible through user-defined dependency scanners for other languages or file types. Unlike Autotools , Gcc 's built in dependency analysis is not used. Instead, a Regexp scan for "#include" is done over all C/C++ source files. For a gcc based build, this means that dependency generation can be slower (i.e. an extra scan is always needed) and less reliable (in the sense that things like preprocessor flags, e.g. -DSOMETHING, are ignored), but it is more portable since the same scanner can be used for non-gcc compilers.
- Built-in support for C , C++ , D , Java , Fortran , Objective-C , Yacc , Lex , Qt and SWIG , and building TeX and LaTeX documents. Other languages or file types can be supported through user-defined Builders for other languages or file types.
- Building from central repositories of source code and/or pre-built targets.
- Built-in support for fetching source files from SCCS , RCS , CVS , Subversion , BitKeeper and Perforce .
- Built-in support for Microsoft Visual Studio .NET and past Visual Studio versions, including generation of .dsp, .dsw, .sln and .vcproj files.
- Detection of file content changes using MD5 signatures; optional, configurable support for traditional timestamps.
- Support for parallel builds which keeps the specified number of jobs running simultaneously regardless of directory hierarchy.
- Integrated Autoconf-like support for finding #include files, libraries, functions and typedefs.
- Global view of all dependencies, so multiple build passes or reordering targets is not required.
- Ability to share built files in a cache to speed up multiple builds - like ccache but for any type of target file, not just C/C++ compilation.
- Designed from the ground up for cross-platform builds, and known to work on Linux , other POSIX systems (including AIX , ---BSD Systems , HP-UX , IRIX and Solaris ), Windows NT , Mac OS X , and OS/2 .
Program('main.c')
When the user runs the 'scons' command, scons will build a 'main' executable (on
Linux ) or 'main.exe' (on
Windows ).
SCons began life as the 'ScCons' build tool design which won the
Software Carpentry SC Build competition in August
2000 . That design was in turn based on the
Cons software construction utility.
Waf , formerly known as "SCons/BKsys", is a tool inspired by SCons that emerged in the
KDE community. For some time, there were plans to use it as the build tool for KDE 4 and beyond, but they were later scrapped in favor of
CMake .
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