boehm-gc doesn't currently build on Solaris 12 since that release
finally removed the old unstructured /proc, thus the PIOCOPENPD ioctl.
This is already mentioned in the Solaris 11 EOF list:

	http://www.oracle.com/technetwork/systems/end-of-notices/eonsolaris11-392732.html

Since the replacement (using /proc/<pid>/pagedata directly) has been
available since Solaris 2.6 in 1997, there's no need to retain the old
code, especially given that mainline only supports Solaris 10 and up.

Bootstrapped without regressions on i386-pc-solaris2.1[12] and
sparc-sun-solaris2.1[12], will install on mainline.  Will backport to
the gcc 5 branch after some soak time.

	Rainer


2015-02-10  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* os_dep.c [GC_SOLARIS_THREADS] (GC_dirty_init): Use
	/proc/<pid>/pagedata instead of PIOCOPENPD.