Roland Ver. 4.5 Informações Técnicas descarregar pdf (Página 88)

78 GNU make

libs_for_gcc = -lgnu

normal_libs =

ifeq ($(CC),gcc)

libs=$(libs_for_gcc)

else

libs=$(normal_libs)

endif

foo: $(objects)

$(CC) -o foo $(objects) $(libs)

7.2 Syntax of Conditionals

The syntax of a simple 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 is used instead.

The syntax of a complex conditional is as follows:

conditional-directive

text-if-true

else

text-if-false

endif

or:

conditional-directive-one

text-if-one-is-true

else conditional-directive-two

text-if-two-is-true

else

text-if-one-and-two-are-false

endif

There can be as many “else conditional-directive” clauses as necessary. Once a given

condition is true, 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.

The syntax of the conditional-directive is the same whether the conditional is simple

or complex; after an else or not. There are four diﬀerent directives that test diﬀerent

conditions. Here is a table of them:

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 211 212

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