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(make.info)Pattern-specific

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Pattern-specific Variable Values
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   In addition to target-specific variable values (Note:
Target-specific Variable Values.), GNU `make' supports
pattern-specific variable values.  In this form, a variable is defined
for any target that matches the pattern specified.  Variables defined in
this way are searched after any target-specific variables defined
explicitly for that target, and before target-specific variables defined
for the parent target.

   Set a pattern-specific variable value like this:

     PATTERN ... : VARIABLE-ASSIGNMENT

or like this:

     PATTERN ... : override VARIABLE-ASSIGNMENT

where PATTERN is a %-pattern.  As with target-specific variable values,
multiple PATTERN values create a pattern-specific variable value for
each pattern individually.  The VARIABLE-ASSIGNMENT can be any valid
form of assignment.  Any command-line variable setting will take
precedence, unless `override' is specified.

   For example:

     %.o : CFLAGS = -O

will assign `CFLAGS' the value of `-O' for all targets matching the
pattern `%.o'.