[PATCH] split assume pipe2/dup3/sock_cloexec knobs

[Mike Frysinger]

On Friday 17 August 2012 23:49:22 Roland McGrath wrote:
> Incidentally it makes me wonder why we don't have attribute_hidden
> on all such variables.  As it is, they all get GOT slots needing
> startup-time R_*_RELATIVE relocs (and corresponding indirection cost
> at runtime), don't they?

it does look that way.  other __have_xxx vars are marked with attribute_hidden 
too.  i'll post a follow up patch.

> I wonder if there is something analogous to check-localplt that we
> could come up with for global-variable GOT slots and root this out
> generally.

annoyingly, `readelf -r` doesn't decode the symbols for R_X86_64_RELATIVE 
relocs.  so i think we might have to fix that first.

> More radically, we could conceivably one day just
> compile everything with -fvisibility=hidden and specifically
> annotate (via some new libc-symbol.h macro shorthand) each function
> intended to be exported with an overriding attribute.  Hmm.

that might just be crazy enough to work ;)
-mike
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