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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 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 How to Use Variables, and Functions for Transforming Text.

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• Pattern Intro - An introduction to pattern rules.
• Pattern Examples - Examples of pattern rules.
• Automatic Variables - How to use automatic variables in the recipe 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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Licensed under the GNU Free Documentation License.
- https://www.gnu.org/software/make/manual/html_node/Pattern-Rules.html -

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