Roland Ver. 4.5 Informações Técnicas descarregar pdf (Página 84)

74 GNU make

# Query the default goal.

ifeq ($(.DEFAULT_GOAL),)

$(warning no default goal is set)

endif

.PHONY: foo

foo: ; @echo $@

$(warning default goal is $(.DEFAULT_GOAL))

# Reset the default goal.

.DEFAULT_GOAL :=

.PHONY: bar

bar: ; @echo $@

$(warning default goal is $(.DEFAULT_GOAL))

# Set our own.

.DEFAULT_GOAL := foo

This makeﬁle prints:

no default goal is set

default goal is foo

default goal is bar

foo

Note that assigning more than one target name to .DEFAULT_GOAL is invalid

and will result in an error.

MAKE_RESTARTS

This variable is set only if this instance of make has restarted (see Section 3.5

[How Makeﬁles Are Remade], page 14): it will contain the number of times this

instance has restarted. Note this is not the same as recursion (counted by the

MAKELEVEL variable). You should not set, modify, or export this variable.

MAKE_TERMOUT

MAKE_TERMERR

When make starts it will check whether stdout and stderr will show their output

on a terminal. If so, it will set MAKE_TERMOUT and MAKE_TERMERR, respectively,

to the name of the terminal device (or true if this cannot be determined). If set

these variables will be marked for export. These variables will not be changed

by make and they will not be modiﬁed if already set.

These values can be used (particularly in combination with output synchroniza-

tion (see Section 5.4.1 [Output During Parallel Execution], page 47) to deter-

mine whether make itself is writing to a terminal; they can be tested to decide

whether to force recipe commands to generate colorized output for example.

If you invoke a sub-make and redirect its stdout or stderr it is your responsibility

to reset or unexport these variables as well, if your makeﬁles rely on them.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 211 212

Sem comentários

Roland Ver. 4.5 Informações Técnicas Página 84