__librt_multiple_threads for nptl?

[Alexandre Oliva]

No current ports need this (not even the FR-V port, that has recently
been converted to use info from the TCB instead of relying on this
global var), but it was surprising to me that any DTV_AT_TP port is
now required to use this trick.  It sure is a tiny little bit more
efficient for uses within librt, but what if it required an ABI
change?

I was a bit concerned about breaking ABI compatibility changing FR-V
to use multiple_threads in the TCB, as opposed to using this
variable, but I'm now convinced it's not an issue.  Am I mistake?

Anyhow, how about installing this patch, or at least enabling a port
to define some macro to get this variable defined in librt?  Some mq
functions definitely need it.

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}