Unix Programming - how to pass macro definition from parent makefile to child makefile

Author

how to pass macro definition from parent makefile to child makefile

Liang

2004-07-20, 3:57 am

Hi,

I need to write 2 makefile, say a.mk and b.mk. 'a.mk' is the main entrance,
and the macros are set in it. Some rules are defined in b.mk. For example,
the rules for TargetB.

#a.mk
CFG = Release
TargetB:
$(MAKE) -f b.mk $@

#b.mk
TargetB:
$(BLD_CMD)

But I want to pass $CFG from a.mk to b.mk. How to do this?

Thanks,
Liang

Jens.Toerring@physik.fu-berlin.de

2004-07-20, 3:57 am

Liang <leo2002chen@hotmail.com> wrote:
> I need to write 2 makefile, say a.mk and b.mk. 'a.mk' is the main entrance,
> and the macros are set in it. Some rules are defined in b.mk. For example,
> the rules for TargetB.

> #a.mk
> CFG = Release
> TargetB:
> $(MAKE) -f b.mk $@

> #b.mk
> TargetB:
> $(BLD_CMD)

> But I want to pass $CFG from a.mk to b.mk. How to do this?

Add a line like

export CFG

or, putting assignment and exporting in a single line,

export CFG = Release

to a.mk, then it becomes visible in sub-makefiles

Regards, Jens
--
\ Jens Thoms Toerring ___ Jens.Toerring@physik.fu-berlin.de
\__________________________ http://www.toerring.de

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