Re: $(HOSTNAME) not set in a makefile?

["H.S." <hs.samix@gmail.com>]

Karl E. Jorgensen wrote:
> On Thu, Apr 26, 2007 at 10:06:40PM -0400, H.S. wrote:
> > In a makefile, if I have a rule to:
> > 	echo $(HOSTNAME);
> >
> > it return a blank line, as if the variable is not set. Echoing $(HOME) 
> > works, $(LANG) works, what is the deal with $(HOSTNAME)?
>
> HOSTNAME is a variable that bash(1) sets - but it is *not* exported. You
> can force it to be exported by
>     $ export HOSTNAME
> in your login script.
>
> But ... relying on bash is decidedly non-portable. Why not use 
>     `hostname`
> instead?


Yes, I discovered that yesterday and it works in the Makefile:
HOST=`hostname`

and I just use $(HOST) later in the Makefile.



> > Echoing $(HOSTNAME) on a command prompt works though.
>
> It does? Perhaps you're not using bash after all? I get:
>     -bash: HOSTNAME: command not found
>
> Note: the $(command) construct in bash is functionally identical to
> `command` ...
>
> Perhaps you meant ${HOSTNAME} (note the curly brackets) at the command
> prompt?

Yes. Typo while writing the above message.

Thanks,
->HS