re PR libstdc++/51558 (Declaration of unspecialized std::hash<_Tp>::operator()(_Tp) turns compile-time errors into link-time errors)

2011-12-15  Paolo Carlini  <paolo.carlini@oracle.com>
	    Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/51558
	* include/bits/functional_hash.h (struct hash): Add static_assert.
	* src/compatibility-c++0x.cc: Adjust compatibility definitions.
	* testsuite/23_containers/unordered_map/erase/51142.cc: Adjust.
	* testsuite/23_containers/unordered_set/erase/51142.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/erase/51142.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/erase/51142.cc: Likewise.

Co-Authored-By: Jonathan Wakely <jwakely.gcc@gmail.com>

From-SVN: r182392