繼續翻譯
prerequisites of the goal. if some other rule
isnot depended on by the
goal (or anything it depends on, etc.), that rule
isnot processed,
unless you tell `make
'to do so (with a command such as `make clean
').
before recompiling an
object file, `make'
considers updating its
prerequisites, the source file and header files. this makefile does not
specify anything to be done
for them--the `.c'
and `.h
'files are not
the targets of any rules--so `make'
does nothing for these files. but
`make'
would update automatically generated c programs, such as those
made by bison or yacc, by their own rules at this time.
其他的規則被處理的原因是，他們的目的出現在了終點的前提條件上。如果乙個規則沒有出現在終點的依賴序列中，則此規則不會得到處理。除非你強制 make 去處理(例如 執行 make clean)。
在重新編譯乙個目標檔案之前， make 會先幹更改此目標檔案的前提條件，即原始檔和標頭檔案。
此makefile 不會指定任何任務--.c 和 .h 檔案不是任何規則的目的--所以 make 不會處理它們。但是make 會自動地生成 c 程式，例如那些由 規則所指定，進而被如bison 或者 yacc 生成的c程式。
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