( Pattern Match

Info Catalog ( Automatic Variables ( Pattern Rules ( Match-Anything Rules
 10.5.4 How Patterns Match
 A target pattern is composed of a `%' between a prefix and a suffix,
 either or both of which may be empty.  The pattern matches a file name
 only if the file name starts with the prefix and ends with the suffix,
 without overlap.  The text between the prefix and the suffix is called
 the "stem".  Thus, when the pattern `%.o' matches the file name
 `test.o', the stem is `test'.  The pattern rule prerequisites are
 turned into actual file names by substituting the stem for the character
 `%'.  Thus, if in the same example one of the prerequisites is written
 as `%.c', it expands to `test.c'.
    When the target pattern does not contain a slash (and it usually does
 not), directory names in the file names are removed from the file name
 before it is compared with the target prefix and suffix.  After the
 comparison of the file name to the target pattern, the directory names,
 along with the slash that ends them, are added on to the prerequisite
 file names generated from the pattern rule's prerequisite patterns and
 the file name.  The directories are ignored only for the purpose of
 finding an implicit rule to use, not in the application of that rule.
 Thus, `e%t' matches the file name `src/eat', with `src/a' as the stem.
 When prerequisites are turned into file names, the directories from the
 stem are added at the front, while the rest of the stem is substituted
 for the `%'.  The stem `src/a' with a prerequisite pattern `c%r' gives
 the file name `src/car'.
Info Catalog ( Automatic Variables ( Pattern Rules ( Match-Anything Rules
automatically generated byinfo2html