• Efficient parallel compilation
  • Local and network cache support
  • Lightning fast "nothing to build"
  • Unity/Blob builds with iteration enhancements
  • Distributed compilation
  • Build multiple platforms at once
  • Build multiple targets at once
  • Compile on Windows, OS X and Linux
  • Target Windows, OS X, Linux, IOS, Android, Xbox 360, Xbox One, Xbox Series S/X, PS3, PS4, PS5, Wii, WiiU, Switch and more
  • Supports MSVC, GCC, SNC, Clang, GreenHills, CodeWarrior, NVCC (CUDA), VBCC and more
  • Tiny, self-contained executable
  • Small run-time memory usage
  • No external dependencies
  • No installation required
Easy to use
  • Modern configuration syntax
  • Human readable errors
  • Visual studio and XCode compatible
  • Test support
  • Build statistics
  • Progress bar
  • Visual Studio and XCode Project generation


Efficient parallel compilation

FASTBuild was designed from the ground up to support parallel compilation. The highly optimized main build pipeline is designed to be as thin as possible, dispatching build tasks to worker threads to maximize parallelism.

FASTBuild has no artificial dependency bottlenecks like those present when compiling with Visual Studio/MSBuild. Unlike Visual Studio, FASTBuild is able to precisely manage the number of CPU cores used during a build avoiding excessive idle spots or excessive context switching due to spawning too many threads.

FASTBuild is a native Windows/OS X/Linux application, with all functionality built-in, avoiding the process-invocation overhead present in systems like make.

Processing and management of the build graph occurs in highly optimized C++ code, avoiding performance issues present in systems like Scons.

Built-in cache support

Build caching is supported as a built-in feature. A single line in the configuration file enables sharing of build results via a local or network cache. Caching can accelerate compile times up to 10x.

Lightning fast "nothing to build"

FASTBuild knows the entire dependency graph before the build starts and can perform the absolute minimum IO required to determine which files need building. The build state is saved between invocations to minimize work required for incremental and "nothing" builds. The build configuration file is only parsed when it changes. Performance of no-op build is important in automated testing and build scenarios.

FASTBuild supports automatically generated Unity/Blob builds. By including many cpp files into single a single Unity (or Blob) file, compilation and link times can be greatly reduced. Improvements of 10x or more are not uncommon. Unity in FASTBuild is compatible with network distribution and caching. Unity can automatically build "open for edit" (writable) files individually, allowing quicker iteration times when working.
Distributed Compilation

FASTBuild supports distributed compilation, allowing you to take advantage of unused CPU resources on your network to accelerate compilation. Speedups of 5x are common.


Tiny, self-contained executables
FASTBuild executables are small, weighing in at ~1MiB each. FASTBuild requires no external DLLs, libraries, 3rd party software or executables (other than those belonging to your compiler(s)). It runs on a clean install of Windows (7 or later), OS X (10.7+) or Linux.
Small run-time memory usage
FASTBuild uses very little memory, apart from some per-cpu work buffers. A typical 8 core machine has a footprint of under 100MB. More free memory means better IO caching by the OS.
No installation required
The single executable for FASTBuild does not need installation. It can simply be copied to a machine and run, or checked into revision control and versioned alongside your build (ideal for automated build systems).


Build multiple platforms at once
FASTBuild can target multiple (and any combination of) defined targets (or even all of them) simultaneously. This is ideal for building multiple platforms when verifying compilation before check-in, or as part of an automated build system. This is especially useful if some of your targets have large linking bottlenecks, such as those introduced by Link-Time Code Generation.
Build multiple targets at once
As with buiding multiple platforms simultaneously, FASTBuild can build multiple versions of the same platform simultaneously. For example you can build the "debug", "release" and "retail" configurations in parallel. Again, this is ideal for maximizing performance on automated build servers or during pre-submit "sanity-check" compiles.
Support Consoles, Windows, Linux, OS X, Smartphones and more
FASTBuild runs on Windows, Linux and OS X, targeting those platforms. It also supports targetting all major consoles, smartphones, tablets and retro systems. Supported compilers are MSVC, GCC, SNC, Clang, GreenHills, CodeWarrior & CUDA. It will also work with any other syntactically compatible command line compilers, preparing it for more platforms in the future.

Easy to Use

Modern configuration syntax
FASTBuild uses a bespoke configuration language, designed to simplify the configuration of code compilation. Configuration files are orders of magnitude smaller than Visual Studio project files or makefiles and are human readable.
Human readable errors
When FASTBuild fails to parse a configuration file, a human-readable error is emitted pinpointing the exact location of the error (in Visual Studio compatible) file(line:row) format.
Visual studio compatible
FASTBuild output, whether it be build progress or config parsing errors, is output in Visual Studio compatible format. If you want to route FASTBuild output through Visual Studio, you will have the same error integration as if you were compiling using Visual Studio itself.


Test support
FASTBuild contains built in support for running Tests. Tests are automatically compiled and executed only when relevant source is modified or other dependencies change.
Build statistics
FASTBuild gathers build statistics during the build and can report them upon completion. A short compilation summary can be provided, or a full build report can be generated. This information can be used to further improve compile times by targetting large compilation units or libraries, and clearly measuring gains as you optimize compilation.
Progress Bar
FASTBuild tracks build times across build and can use this information to estimate progress through the current build.
Visual Studio and XCode Project generation
FASTBuild can generate .vcxproj and .sln to integrate FASTBuild compilation into the Visual Studio IDE. Similarly, XCode projects can be generated to integrate FASTBuild compilation into the XCode IDE.