The -e option confuses the $(origin ) ?

[Masahiro Yamada]

Hi.

I have a question about the -e option.

'man make' shows this:

       -e, --environment-overrides
            Give variables taken from the environment  precedence  over  vari‐
            ables from makefiles.

But, as a side-effect, the result of $(origin ) is changed.

I am not sure whether it is intended or not.



Test code
=======

masahiro@oscar:~/workspace/foo$ cat Makefile
$(warning the origin of FOO is: $(origin FOO))
$(warning the value of FOO is: $(FOO))

all:
        $(MAKE) -e -f Makefile.sub1 FOO=1

masahiro@oscar:~/workspace/foo$ cat Makefile.sub1
$(warning the origin of FOO is: $(origin FOO))
$(warning the value of FOO is: $(FOO))

all:
        $(MAKE) -f Makefile.sub2

masahiro@oscar:~/workspace/foo$ cat Makefile.sub2
$(warning the origin of FOO is: $(origin FOO))
$(warning the value of FOO is: $(FOO))

all:
        @:



Result
=====

masahiro@oscar:~/workspace/foo$ export FOO=2
masahiro@oscar:~/workspace/foo$ make
Makefile:1: the origin of FOO is: environment
Makefile:2: the value of FOO is: 2
make -e -f Makefile.sub1 FOO=1
make[1]: Entering directory '/home/masahiro/workspace/foo'
Makefile.sub1:1: the origin of FOO is: command line
Makefile.sub1:2: the value of FOO is: 1
make -f Makefile.sub2
make[2]: Entering directory '/home/masahiro/workspace/foo'
Makefile.sub2:1: the origin of FOO is: environment
Makefile.sub2:2: the value of FOO is: 1
make[2]: Leaving directory '/home/masahiro/workspace/foo'
make[1]: Leaving directory '/home/masahiro/workspace/foo'







I think the log from Makefile.sub2 is strange:
Makefile.sub2:1: the origin of FOO is: environment
Makefile.sub2:2: the value of FOO is: 1

Apparently, FOO=1 was specified in the command line.




--
Best Regards
Masahiro Yamada