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This paper describes a software-build tool named Amake, an extension of GNU Make. Its additional features solve important problems that have, until now, only been addressed by “high-end” build tools (e.g., ClearCase and Vesta).With a typical build tool, if a top-level target must be updated, intermediate targets must be built from sources, and then combined to build the top-level target. The enhancements...
This paper presents an algorithm for computing a change log for an element whose history includes merges. A change log is a list of comments corresponding to versions “between” two selected versions. For example, a user may want to know what changes were made to element foo.c, between the versions labeled Release1 and Release2.
Software merging is the process of combining multiple existing versions of a source file, to produce a new version. Typically, the goal is for the new version to implement some kind of union of the features implemented by the existing versions. A variety of merge tools are available, but software merging is still a tedious process, and mistakes are easy to make. This paper describes the fundamentals...
In many software configuration management (SCM) systems, brnching and merging are fundamental operations, supporting isolation and integration respectively. Unfortunately, the obvious branching and merging strategies have unpleasant consequences. This paper presents a less obvious branching and merging strategy, for parallel software development, which does not suffer these cosequences. In particular,...
This paper explains how to improve the quality of an existing Makefile-based build system, using a new variant of Make. Ordinary file-oriented dependencies are detected, recorded, and monitored automatically. Checksums are compared, rather than timestamps. Other important dependencies are also processed automatically. This provides an accurate, compact, and low-maintenance build system. Experiences...
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