GNU Info

(make.info)Functions

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Functions for Transforming Text
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   "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 where the function appears when `make' expands the construct
in which it appears. Some constructs are expanded when `make' first
reads the makefile and others are expanded later. (Note: Reading
Makefiles.)

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.