GNU make
supports some variables that have special properties.
MAKEFILE_LIST
make
, in
the order in which it was parsed. The name is appended just
before make
begins to parse the makefile. Thus, if the first
thing a makefile does is examine the last word in this variable, it
will be the name of the current makefile. Once the current makefile
has used include
, however, the last word will be the
just-included makefile.
If a makefile named Makefile
has this content:
name1 := $(lastword $(MAKEFILE_LIST)) include inc.mk name2 := $(lastword $(MAKEFILE_LIST)) all: @echo name1 = $(name1) @echo name2 = $(name2)
then you would expect to see this output:
name1 = Makefile name2 = inc.mk
.DEFAULT_GOAL
.DEFAULT_GOAL
variable allows you to discover the current
default goal, restart the default goal selection algorithm by clearing
its value, or to explicitly set the default goal. The following
example illustrates these cases:
# Query the default goal. ifeq ($(.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
illegal and will result in an error.
MAKE_RESTARTS
make
has
restarted (see How Makefiles Are Remade): 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.
.RECIPEPREFIX
.RECIPEPREFIX = > all: > @echo Hello, world
The value of .RECIPEPREFIX
can be changed multiple times; once set
it stays in effect for all rules parsed until it is modified.
.VARIABLES
.FEATURES
make
. Possible values include:
ar
(archive) files using special filename syntax.
See Using make
to Update Archive Files.
-L
(--check-symlink-times
) flag.
See Summary of Options.
.INCLUDE_DIRS
make
searches for
included makefiles (see Including Other Makefiles).