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gnu_indirect_function support in front and back ends

From: Mike Frysinger <vapier at gentoo dot org>
To: binutils at sourceware dot org
Date: Wed, 29 Sep 2010 23:03:09 -0400
Subject: gnu_indirect_function support in front and back ends

atm, gas will happily accept "gnu_indirect_function" as a type and emit a 
symbol of type IFUNC even if the target-specific back end doesnt support it.  
is this expected behavior ?

the trouble is that glibc uses this simple test to figure out whether to 
enable a multiarch build.  if using binutils-2.20 for a target that doesnt 
support this stuff, glibc will still enable it.
-mike

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