(make.info)Pattern Rules


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Defining and Redefining Pattern Rules
=====================================

   You define an implicit rule by writing a "pattern rule".  A pattern
rule looks like an ordinary rule, except that its target contains the
character `%' (exactly one of them).  The target is considered a
pattern for matching file names; the `%' can match any nonempty
substring, while other characters match only themselves.  The
dependencies likewise use `%' to show how their names relate to the
target name.

   Thus, a pattern rule `%.o : %.c' says how to make any file `STEM.o'
from another file `STEM.c'.

   Note that expansion using `%' in pattern rules occurs *after* any
variable or function expansions, which take place when the makefile is
read.  Note: How to Use Variables, and Note: Functions
for Transforming Text.

* Pattern Intro
An introduction to pattern rules.
* Pattern Examples
Examples of pattern rules.
* Automatic
How to use automatic variables in the commands of implicit rules.
* Pattern Match
How patterns match.
* Match-Anything Rules
Precautions you should take prior to defining rules that can match any target file whatever.
* Canceling Rules
How to override or cancel built-in rules.

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