builtins.c (expand_builtin_atomic_exchange): Remove error when memory model is CONSUME.

builtins.c (expand_builtin_atomic_exchange): Remove error when memory model is CONSUME.

2015-01-14  Andrew MacLeod  <amacleod@redhat.com>

	* builtins.c (expand_builtin_atomic_exchange): Remove error when
	memory model is CONSUME.
	(expand_builtin_atomic_compare_exchange, expand_builtin_atomic_load,
	expand_builtin_atomic_store): Change invalid memory model errors to
	warnings.
	(expand_builtin_atomic_clear): Change invalid model errors to warnings
	and issue warning for CONSUME.
	* testsuite/gcc.dg/atomic-invalid.c: Check for invalid memory model
	warnings instead of errors.

M    gcc/ChangeLog
M    gcc/builtins.c
M    gcc/testsuite/ChangeLog
M    gcc/testsuite/gcc.dg/atomic-invalid.c

From-SVN: r219615