[Bug ld/23161] __bss_start, _end and _edata aren't marked as hidden

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23161

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mark Johnston from comment #2)
> (In reply to Alan Modra from comment #1)
> FreeBSD's libc uses _end to initialize curbrk. At a glance, OpenBSD and
> NetBSD appear to do this as well. For this use case it is crucial that _end
> be present in the executable's dynsym, since libc will otherwise use its
> internal definition.

In glibc, ld.so has

/* These defined magically in the linker script.  */
extern char _begin[] attribute_hidden;
extern char _etext[] attribute_hidden;
extern char _end[] attribute_hidden;

it can't reference _end defined in executables.

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