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bug#23760: 25.0.95; emacs 25.0.95 doesn't build with glibc-2.23.90

From: Paul Eggert
Subject: bug#23760: 25.0.95; emacs 25.0.95 doesn't build with glibc-2.23.90
Date: Sun, 19 Jun 2016 05:02:17 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

If I understand things correctly, the Emacs 'configure' script discovered that the test glibc version did not declare and define a symbol __malloc_initialize_hook, and so Emacs supplied its own implementation of malloc, complete with __malloc_initialize_hook. Since __malloc_initialize_hook was poisoned, this didn't work.

I suppose Emacs could work around the problem by using __malloc_initialize_hook when linked against an old glibc, and by using a new symbol emacs_malloc_initialize_hook when linked against its substitute implementation. Although this would insulate distant-future versions of Emacs against the poisoning, it wouldn't work for Emacs 25 (the next Emacs version) and earlier; these systems would be unbuildable with a glibc that poisons __malloc_initialize_hook. So as a practical matter, aren't we better off having glibc simply not declare __malloc_initialize_hook? That should work with older Emacs versions, which is a win. I don't see a significant practical advantage to poisoning the symbol.

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