make: Functions

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1 8 Functions for Transforming Text
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1 "Functions" allow you to do text processing in the makefile to compute
1 the files to operate on or the commands to use in recipes.  You use a
1 function in a "function call", where you give the name of the function
1 and some text (the "arguments") for the function to operate on.  The
1 result of the function's processing is substituted into the makefile at
1 the point of the call, just as a variable might be substituted.
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