re PR middle-end/60797 (gcc hangs with error: only weak aliases are supported in this configuration)

2014-04-11  Richard Biener  <rguenther@suse.de>

	PR middle-end/60797
	* varasm.c (assemble_alias): Avoid endless error reporting
	recursion by setting TREE_ASM_WRITTEN.

	* gcc.dg/pr60797.c: New testcase.

From-SVN: r209299