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SPECIFICTION
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Buck2 vs GNU Automake

Buck2

buck2.build

GNU Automake

gnu.org

Side by side

FigureBuck2GNU Automake
Price fromFreeFree
Free planYesYes
Free trial——
Open source——
WindowsYes—
macOSYes—
LinuxYes—
Self-hostedYes—
Plans published11
Spec score · Build Automation Software8.1 (#12)7.4 (#28)
IntegrationsThe project says BuildBarn, BuildBuddy, EngFlow, and NativeLink work with its distributed compilation support through the Bazel Remote Execution API.Automake works with Autoconf and documents building shared libraries using GNU Libtool.
PurposeBuck2 is a large-scale, fast, hermetic, multi-language build system and the successor to Buck.GNU Automake generates GNU Coding Standards compliant Makefile.in files from Makefile.am templates.
SupportThe project directs users to report issues through GitHub and provides a community Discord server.Automake provides public mailing lists for discussion, patches, and bug reports.

Plans

Buck2

  • Open sourceFree

Buck2 pricing →

GNU Automake

  • GNU AutomakeFree

GNU Automake pricing →

In their own words

Buck2

Buck2 is a free build system from Meta for large-scale repositories that combine multiple programming languages. It uses Starlark rules, a dynamic dependency graph, and incremental actions to support extensible builds. Its language table lists prelude rules for C/C++, Erlang, Go, Haskell, Java, Kotlin, OCaml, Python, and Rust, though usability varies by language. Build actions can run remotely through services exposing Bazel's remote execution API; the project lists BuildBarn, BuildBuddy, EngFlow, and NativeLink as compatible with its distributed compilation support. Buck2 supports filesystem watching and can integrate with Meta's optional Eden virtual filesystem. Rules are hermetic by default and missing dependencies are errors, but local-only build steps are not sandboxed. The project describes Buck2 as early-stage and says it has no stable release tag; its latest binary tag changes with repository pushes. It warns that outside users may encounter rough edges, missing features, and missing toolchains. Source and binaries are available under MIT and Apache-2.0 licenses. The project directs users to GitHub for issue reports and offers a community Discord server.

Visit buck2.build

GNU Automake

GNU Automake has no write-up on Specifiction yet; its figures are above.

Visit gnu.org