Warn about missing -DMULTIPLICITY if likely a problem

Warn about missing -DMULTIPLICITY if likely a problem

Subject: Re: multiple embedded interpreter example in perlembed.pod fails

Ken Fox <kfox@ford.com> wrote:
> I wrote:
>
> > Multiple embedded interpreters don't work.  Here's a transcript:
> ...
> >     ccflags =''
>
> Ugh.  Stupid user error.  I ran Configure with -DMULTIPLICITY instead
> of -Dccflags='-DMULTIPLICITY'.  Sorry for the confusion.

you can also 'make LIBPERL=libperlm.a', libperld, libperldm, etc., or
edit cflags by hand after Configure.

> Could the
> runtime error message be improved to let people know when they've made
> this mistake?

good idea, something like the patch below?  I'm not sure of other
cases where e_fp would be bogus.

p5p-msgid: 199703192345.SAA15070@postman.osf.org