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

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* Syntax of Functions         How to write a function call.
* Text Functions              General-purpose text manipulation functions.
* File Name Functions         Functions for manipulating file names.
* Foreach Function            Repeat some text with controlled variation.
* If Function                 Conditionally expand a value.
* Call Function               Expand a user-defined function.
* Origin Function             Find where a variable got its value.
* Shell Function              Substitute the output of a shell command.
* Make Control Functions      Functions that control how make runs.
 

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