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A '''build system''' or '''build automation tool'''<ref>{{cite journal|last=Maudoux|first=Guillaume|title=Correct, Efficient and Tailored: The Future of Build Systems|journal=IEEE Software|date=2018|volume=35 |issue=2 |pages=32–37 |doi=10.1109/MS.2018.111095025 |url=https://dial.uclouvain.be/pr/boreal/object/boreal%3A189586/datastream/PDF_01/view|access-date=2025-02-15}}</ref> is a [[programming tool|tool]] or [[List of build automation software|set of tools]] that [[build automation|automate]] the [[Compiler|compilation]] and [[linker (computing)|linking]] of [[source code]] into an [[executable]] [[software|program]] or [[library (computing)|library]]. It streamlines the [[software development]] process by managing dependencies, resolving conflicts, and ensuring consistent [[software build|builds]] across different environments.
When software projects grow complex, their build steps may involve multiple [[programming languages]] or compilation units, making manual build processes increasingly cumbersome. Dependencies between code components necessitate careful ordering and potentially different tools for each piece. Managing these dependencies manually can quickly lead to version conflicts, stale binaries, and difficulty tracking updates, making solutions such as [[shell script|shell scripts]] too difficult to maintain.<ref>{{cite web|title=Why a Build System?|url=https://bazel.build/basics/build-systems|publisher=[[Bazel (software)]]|access-date=2025-02-15}}</ref>
While individual developers might [[compiler|compile]] code directly, a robust build system is foundational to efficient software development in large organizations and teams, where [[build automation|automated builds]] become commonplace and most builds are triggered automatically rather than manually.<ref>{{cite web|title=Why a Build System?|url=https://bazel.build/basics/build-systems|publisher=[[Bazel (software)]]|access-date=2025-02-15}}</ref> Given the essencial role of build systems, it is said that they act as "repositories of essential build knowledge".<ref>{{cite journal|last=Maudoux|first=Guillaume|title=Correct, Efficient and Tailored: The Future of Build Systems|journal=IEEE Software|date=2018|volume=35 |issue=2 |pages=32–37 |doi=10.1109/MS.2018.111095025 |url=https://dial.uclouvain.be/pr/boreal/object/boreal%3A189586/datastream/PDF_01/view|access-date=2025-02-15}}</ref> They effectively eliminate roadblocks and accelerates development velocity by enabling engineers to share resources and results.<ref>{{cite web|title=Build Basics|url=https://bazel.build/basics|publisher=[[Bazel (software)]]|access-date=2025-02-15}}</ref>
== Key features ==
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