In my Makefile, I include another, generated Makefile:

include Makefile2
Makefile2:
generateMakefile.sh > $@

That's no problem.  But if the path for Makefile2 is created by a shell
command, then that Makefile2 is created in an infinite loop, make does
not stop anymore:

MAKEFILE2 := $(shell mktemp -d /tmp/tmp.XXXXXX)/Makefile2
include $(MAKEFILE2)
$(MAKEFILE2):
generateMakefile.sh > $@

$ make
Makefile:2: /tmp/tmp.wIqe0W/Makefile2: No such file or directory
./generateMakefile.sh > /tmp/tmp.wIqe0W/Makefile2
Makefile:2: /tmp/tmp.LoxxQo/Makefile2: No such file or directory
./generateMakefile.sh > /tmp/tmp.LoxxQo/Makefile2
Makefile:2: /tmp/tmp.Ipt1H6/Makefile2: No such file or directory
./generateMakefile.sh > /tmp/tmp.Ipt1H6/Makefile2
Makefile:2: /tmp/tmp.hIgHFG/Makefile2: No such file or directory
./generateMakefile.sh > /tmp/tmp.hIgHFG/Makefile2
[...]

Why is that, and how can I fix it?  I want that the generated Makefile
is in a random tmp directory.  I made a point of using the :=
assignment, but it obviously doesn't help.

Markus

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Markus Dehmann <markus.dehmann@gmail.com> writes:

> In my Makefile, I include another, generated Makefile:
>
> include Makefile2
> Makefile2:
> 	generateMakefile.sh > $@
>
> That's no problem.  But if the path for Makefile2 is created by a
> shell command, then that Makefile2 is created in an infinite loop,
> make does not stop anymore:
>
> MAKEFILE2 := $(shell mktemp -d /tmp/tmp.XXXXXX)/Makefile2
> include $(MAKEFILE2)
> $(MAKEFILE2):
> 	generateMakefile.sh > $@
>
> $ make
> Makefile:2: /tmp/tmp.wIqe0W/Makefile2: No such file or directory
> ./generateMakefile.sh > /tmp/tmp.wIqe0W/Makefile2
> Makefile:2: /tmp/tmp.LoxxQo/Makefile2: No such file or directory
> ./generateMakefile.sh > /tmp/tmp.LoxxQo/Makefile2
> Makefile:2: /tmp/tmp.Ipt1H6/Makefile2: No such file or directory
> ./generateMakefile.sh > /tmp/tmp.Ipt1H6/Makefile2
> Makefile:2: /tmp/tmp.hIgHFG/Makefile2: No such file or directory
> ./generateMakefile.sh > /tmp/tmp.hIgHFG/Makefile2
> [...]
>
> Why is that, and how can I fix it?  I want that the generated Makefile
> is in a random tmp directory.  I made a point of using the :=
> assignment, but it obviously doesn't help.

MAKEFILE2=dummy
all:
$(MAKE) real MAKEFILE2=$(shell mktemp -d /tmp/tmp.XXXXXX)/Makefile2

real:
@echo done real

-include $(MAKEFILE2)
$(MAKEFILE2):
generateMakefile.sh > $@


--
__Pascal Bourguignon__                     http://www.informatimago.com/
The mighty hunter
Returns with gifts of plump birds,
Your foot just squashed one.

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