Makefile functions

介绍几个比较常见的

1 call function

语法规则

$(call macro-name[, param1 ...])

call is a built-in make function that expands its first argument and replaces occur-

rences of $1, $2, etc., with the remaining arguments it is given.

看下面的例子

define parent

  echo "parent has two parameters: $1, $2"

  $(call child,$1)

endef

define child

  echo "child has one parameter: $1"

  echo "but child can also see parent's second parameter: $2!"

endef

scoping_issue:

        @$(call parent,one,two)

$ make

parent has two parameters: one, two

child has one parameter: one

but child can also see parent's second parameter: two!

2 filter function

words := he the hen other the%

get-the:

         @echo he matches: $(filter he, $(words))

         @echo %he matches: $(filter %he, $(words))

         @echo he% matches: $(filter he%, $(words))

         @echo %he% matches: $(filter %he%, $(words))

$ make

he matches: he

%he matches: he the

he% matches: he hen

%he% matches: the%

3 wildcard

sources := $(wildcard *.c *.h)

4 $(foreach variable,list,body)