[Bug libelf/23903] Uses linux specifc mremap

["bibi584762 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23903

--- Comment #10 from Jean Michault <bibi584762 at gmail dot com> ---
(In reply to Mark Wielaard from comment #9)
> (In reply to Jean Michault from comment #8)
> > Created attachment 11932 [details]
> > patch to allow compile on systems without mremap
> > 
> > I suggest the patch attached.
> > This makes it possible to compile elfutils on nonlinux systems, but
> > generates an error if one tries to use features that need mremap.
> 
> Thanks. Some questions about the proposed patch:
> - What defines HAVE_MMAP?
>   I don't believe we currently have a configure check for it, should we?
> - The guard checks for HAVE_MMAP, but the code calls mremap.
>   Should we have a HAVE_MREMAP guard and configure check instead?
> - On which systems did you test and what were the make check results?

You're right, i was a little too fast, you can have mmap without having mremap,
so you have to test mremap. And we need to add the mremap test in configure.ac.
I will work again.

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