[Bug libelf/23903] Uses linux specifc mremap

["mark at klomp dot org" <sourceware-bugzilla at sourceware dot org>]

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

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
That is a weird error. It means you could compile fine as if mremap was
available, but only during linking it is suddenly discovered that there is no
mremap?

mremap is needed for supporting ELF_C_RDWR_MMAP with ELF files that grow. See
for example the tests/run-copyadd-sections.sh and
tests/run-copymany-sections.sh testcases (and the explanation in the second why
we don't use ELF_C_RDWR_MMAP). mremap is used because it is the only way to
extend an mmap without moving it.

Even on GNU/Linux mremap might fail, in which case writing out an
ELF_C_RDWR_MMAPed ELF file might just not work (it normally works when
extending the file a little, but not when multiple pages are needed).

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