FASTBuild vs qmake

FASTBuild is an open-source build system for compiling software across Linux, macOS and Windows. It runs compilation work across worker threads, can reuse results from local or network caches, and can distribute builds among networked machines when their settings and worker setup are compatible. The maker says caching can accelerate compile times up to 10x. Some compiler settings do not support caching or distribution; FASTBuild handles affected objects without caching or builds them locally. Supported toolchains include MSVC, GCC, SNC, Clang, GreenHills, CodeWarrior and NVCC, plus syntactically compatible command-line compilers. It can combine C++ files into Unity or Blob builds, while allowing writable files to be built individually for quicker iteration. FASTBuild can generate Visual Studio and XCode project files. The maker describes it as a self-contained executable that needs no installation or dependencies beyond compiler tools. It is free, with commercial use and redistribution allowed under license conditions; the license provides the software without warranty. The listed current release is v1.20, released 26-Apr-2026.

qmake manages builds for applications, libraries and other components by turning project files into Makefiles. Its `.pro` files can define source files, configuration, libraries and include paths. It supplies build rules for Qt's moc and uic tools, with templates for applications, libraries and plugins. Projects can specify third-party libraries, and qmake can use pkg-config for supported libraries such as D-Bus and ogg. It can generate Microsoft Visual Studio project files and, on macOS, Xcode project files. Platform notes cover iOS universal binaries, frameworks and bundles. In Qt 6, qmake remains supported for building Qt applications, but cannot compile custom Qt plugins or libraries that rely on Qt 5 build-system internals. Qt warns that building an untrusted project can execute code on the build machine. The Qt Community Edition is free under LGPL or GPL terms, with source-code obligations and limited access to some Qt capabilities.