make: Pattern Rules

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1 10.5 Defining and Redefining Pattern Rules
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1 You define an implicit rule by writing a "pattern rule".  A pattern rule
1 looks like an ordinary rule, except that its target contains the
1 character '%' (exactly one of them).  The target is considered a pattern
1 for matching file names; the '%' can match any nonempty substring, while
1 other characters match only themselves.  The prerequisites likewise use
1 '%' to show how their names relate to the target name.
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1    Thus, a pattern rule '%.o : %.c' says how to make any file 'STEM.o'
1 from another file 'STEM.c'.
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1    Note that expansion using '%' in pattern rules occurs *after* any
1 variable or function expansions, which take place when the makefile is
DONTPRINTYET 1 read.  ⇒How to Use Variables Using Variables, and *noteFunctions
1DONTPRINTYET 1 read.  ⇒How to Use Variables Using Variables, and ⇒Functions

 for Transforming Text Functions.
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Menu

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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
1                                   recipe of implicit rules.
· Pattern Match               How patterns match.
· Match-Anything Rules        Precautions you should take prior to
1                                   defining rules that can match any
1                                   target file whatever.
· Canceling Rules             How to override or cancel built-in rules.
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