Mark Powell schrieb am Mit, 20 Sep 2000:
> On Wed, 20 Sep 2000, Robert Hegemann wrote:
> > Takehiro Tominaga schrieb am Mit, 20 Sep 2000:
> > > >>>>> "R" == Robert Hegemann <[EMAIL PROTECTED]> writes:
> > >
> > > R> I'm using GNU Make version 3.77, does above work for other Make
> > > R> versions?
> > >
> > > Yes, it does not work on 3.77. so I upgraded it 3.78.1 and it works fine.
> > > ---
> > > [EMAIL PROTECTED] // may the source be with you!
> >
> > What is the benefit of ?= instead of =
>
> -----
> There is another assignment operator for variables, `?='. This is
> called a conditional variable assignment operator, because it only has
> an effect if the variable is not yet defined. This statement:
>
> FOO ?= bar
>
> is exactly equivalent to this (*note The `origin' Function: Origin
> Function.):
>
> ifeq ($(origin FOO), undefined)
> FOO = bar
> endif
>
> Note that a variable set to an empty value is still defined, so `?='
> will not set that variable.
The configure script should then check for the installed Make version!
You can't expect that everyone will/can/has the rights to upgrade tools
just for a little bit smarter typing.
If the above expressions are equivalent, why not using the latter which
works on older Make versions too?
> -----
>
> > so that I should
> > upgrade from 3.77 to 3.78.1 ???
>
> Try FreeBSD. A simple:
>
> $ cd /usr/ports/devel/gmake
> $ make all install
>
> Will do everything for you :)
Thanks for the tips! I'm happy with Linux and I know how to
upgrate Make, but I don't see a substantial need to do it ;)
> BTW 3.79.1 is the latest version of GNU make.
>
> Mark Powell - UNIX System Administrator - The University of Salford
> Academic Information Services, Clifford Whitworth Building,
> Salford University, Manchester, M5 4WT, UK.
> Tel: +44 161 295 5936 Fax: +44 161 295 5888 www.pgp.com for PGP key
Ciao Robert
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