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10.5 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 prerequisites 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. See section How to Use Variables, and Functions for Transforming Text.
| 10.5.1 Introduction to Pattern Rules | An introduction to pattern rules. | |
| 10.5.2 Pattern Rule Examples | Examples of pattern rules. | |
| 10.5.3 Automatic Variables | How to use automatic variables in the recipe of implicit rules. | |
| 10.5.4 How Patterns Match | How patterns match. | |
| 10.5.5 Match-Anything Pattern Rules | Precautions you should take prior to defining rules that can match any target file whatever. | |
| 10.5.6 Canceling Implicit Rules | How to override or cancel built-in rules. |
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