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Resources CM Yellow Pages Articles and Whitepapers CM Crossroads Articles Adding set operations to GNU Make
Adding set operations to GNU Make
Address
John Graham-Cumming jgc@jgc.org
by John Graham-Cumming
This month's article covers a recent change to the GNU Make Standard Library (GMSL). The GMSL now has a collection of functions for handling sets.
A set is simply a collection of items without duplication (for more on the underlying theory visit this Wikipedia page).
In the GMSL implementation is a set is a collection of strings without duplication. The strings may not contain spaces. A GMSL set can be used to store a collection of file names, for example, and the GMSL functions ensure that the set has no duplicates.
In this article I describe the functions available and give some simple examples; in next month's article I'll use the set functions to extend the GNU Make Debugger introduced here to include interactive breakpoints on rule execution.
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