Re: how to reference the directory where current Makefile resides ?

[John Graham-Cumming]

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Pax Unix wrote:
> It sounds like you could use MAKEFILE_LIST inside Makefile:
> 
> makefileDir := $(dir $(firstword $(MAKEFILE_LIST)))
> 
> MAKEFILE_LIST contains the paths of all makefiles read (in order) during
> make's invocation.  The above won't quite work, though, if someone
> causes a different file to be included before the Makefile you specified:
> 
>     make -f otherdir/preMakefile  -f Makefile
> 
> In this case, the above would echo 'otherdir/', not './' like I expect
> you want.

As you point out that isn't reliable because of the fact that
MAKEFILE_LIST gets appended any time a Makefile is loaded (e.g. -f or
include).   If you want to work with MAKEFILE_LIST it must be done right
at the start of the Makefile you are in.  My recommendation is that the
first line of the Makefile be:

CURRENT_MAKEFILE_LIST := $(MAKEFILE_LIST)

and then work with CURRENT_MAKEFILE_LIST.

If you do that the your makefileDir becomes:

makefileDir := $(dir $(firstword $(CURRENT_MAKEFILE_LIST)))

and is reliable.

John.
- --
John Graham-Cumming
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Home: http://www.jgc.org/
Blog: http://www.jgc.org/blog/

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