re PR bootstrap/54419 (Compiling libstdc++-v3/src/c++11/random.cc fails on platforms not knowing rdrand)

2012-09-09  Ulrich Drepper  <drepper@gmail.com>
	    Dominique d'Humieres  <dominiq@lps.ens.fr>
	    Jack Howarth  <howarth@bromo.med.uc.edu>

	PR bootstrap/54419
	* acinclude.m4: Define GLIBCXX_CHECK_X86_RDRAND.
	* configure.ac: Use GLIBCXX_CHECK_X86_RDRAND to test for rdrand
	support in assembler.
	* src/c++11/random.cc (__x86_rdrand): Depend on _GLIBCXX_X86_RDRAND.
	(random_device::_M_init): Likewise.
	(random_device::_M_getval): Likewise.
	* configure: Regenerated.
	* config.h.in: Regenerated.

Co-Authored-By: Dominique d'Humieres <dominiq@lps.ens.fr>
Co-Authored-By: Jack Howarth <howarth@bromo.med.uc.edu>

From-SVN: r191111