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Directory Search and Implicit Rules
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Directory Search and Implicit Rules
The search through the directories specified in VPATH or with vpath also happens during consideration of implicit rules (see Using Implicit Rules).
For example, when a file ‘
foo.o’ has no explicit rule, make considers implicit rules, such as the built-in rule to compile ‘foo.c’ if that file exists.
If such a file is lacking in the current directory, the appropriate
directories are searched for it.
If ‘
foo.c’ exists (or is mentioned in the makefile) in any of the directories, the
implicit rule for C compilation is applied.
The commands of implicit rules normally use automatic variables as a matter of
necessity; consequently they will use the file names found by directory search
with no extra effort.
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