Re: Is RULES_JAVA broken?

[Benjamin Franksen <benjamin.franksen@helmholtz-berlin.de>]

Am Dienstag, 16. September 2014, 09:50:44 schrieb J. Lewis Muir:
> On 9/15/14, 11:00 PM, Nerses Gevorgyan wrote:
> > The Makefile is quite simple.
> > vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
> > TOP=../..
> >
> > JAVA_DIR = ~rafopar/Apps/Java/jdk1.7.0_67
>
> I've never used RULES_JAVA, so I'm not commenting on any of your
> reported problems, except I will say that your use of a tilde character
> ('~') in your JAVA_DIR path might be a problem.  That is normally a
> special syntax recognized by certain shells that will be expanded to a
> user's home directory.  That might not work as you're expecting in GNU
> Make.  I suggest replacing that with an absolute path.

Hi Lewis

Gnu make by default uses /bin/sh to execute recipes (one invocation per line),
which should be a posix conformant(*) shell and thus support tilde expansion.
For make itself, the tilde is just another character with no special meaning.

The problem is that makefiles sometimes do non-trivial processing of make
variables before using them in recipes, where they (hopefully) get expanded by
the shell. This is very common in EPICS. If this processing is written in a
way that, for instance, expects an absolute path to start with a '/' then this
processing will fail even though the shell will expand it to one.

So, in practice, +1 to your recommendation.

Cheers
Ben

(*) Interestingly, neither my spell checker nor Webster knows this word, but
I've read it many, many times in English texts so it can't be completely
wrong, or can it?

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