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 8 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.
* Conditional Functions       Functions that implement conditions.
* Foreach Function            Repeat some text with controlled variation.
* Call Function               Expand a user-defined function.
* Value Function              Return the un-expanded value of a variable.
* Eval Function               Evaluate the arguments as makefile syntax.
* Origin Function             Find where a variable got its value.
* Flavor Function             Find out the flavor of a variable.
* Shell Function              Substitute the output of a shell command.
* Make Control Functions      Functions that control how make runs.
 

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