GNU make manual 翻譯 一百八十

繼續翻譯

7.2

syntax of conditionals
*************************=the syntax of a ****** conditional with no `
else
'is as follows:
conditional-directive
text-if-true
endif
the text-if-true may be any lines of text, to be considered as
part of
the makefile 
if the condition is
true.  if the condition is
false
, no
text 
isused instead.
the syntax of a complex conditional 
isas
follows:
conditional-directive
text-if-true
else
text-if-false
endif
or:conditional-directive
text-if-one-is-true
else conditional-directive
text-if-true
else
text-if-false
endif
there can be 
as many "
`else' conditional-directive
" clauses as
necessary.  once a given condition 
istrue, text-if-true is
used and no
other clause 
is used; if no condition is
true then text-if-false is
used.  the text-if-true and text-if-false can be any number of lines of
text.

7.2 條件式的語法

*************************=

簡單的沒有else的條件式的語法如下:

conditional-directive

text-if-true

endif

text-if-true 可以是任意的內容，如果條件為真則其被認為是makefile的一部分。如果條件為假，則沒有任何文字被利用。

複雜的條件式的語法如下:

conditional-directive

text-if-true

else

text-if-false

endif

或者:conditional-directive

text-if-one-is-true

else conditional-directive

text-if-true

else

text-if-false

endif

只要有必要，可以有很多的 else conditional-directive 子句。一旦乙個給定的條件為真，則 text-if-true 就會被利用，而其他的子句就不會再被利用了；如果沒有條件為真，那麼 text-if-false 被利用。text-if-true 和 text-if-false 的子句可以有任意多行。

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