How to define global shell functions in a Makefile?

Question

I want to define a shell function

#!/bin/sh

test ()
{
  do_some_complicated_tests $1 $2;
  if something; then
    build_thisway $1 $2;
  else
    build_otherway         


        

Answer 1

Why not using .ONESHELL in Makefile and define a Makefile function like bash function:

jeromesun@km:~/workshop/hello.test$ tree
.
├── Makefile
└── mkfiles
    └── func_test.mk

1 directory, 2 files
jeromesun@km:~/workshop/hello.test$ cat Makefile 
.ONESHELL:

-include mkfiles/*.mk

test:
        @$(call func_test, one, two)
jeromesun@km:~/workshop/hello.test$ cat mkfiles/func_test.mk 
.ONESHELL:

define func_test
    echo "func_test parameters: 0:$0, 1:$1, 2:$2"
    if [ ! -d abc ]; then
        mkdir abc
        echo "abc not found"
    else
       echo "abc found"
    fi
endef
jeromesun@km:~/workshop/hello.test$ 

Result:

jeromesun@km:~/workshop/hello.test$ make test 
func_test parameters: 0:func_test, 1: one, 2: two
abc not found
jeromesun@km:~/workshop/hello.test$ make test 
func_test parameters: 0:func_test, 1: one, 2: two
abc found