re PR tree-optimization/58689 ([meta-bug] __attribute__((returns_nonnull)) enhancements)

2013-10-29  Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/58689
include/
	* ansidecl.h (ATTRIBUTE_RETURNS_NONNULL): New macro.
	* libiberty.h (basename, lbasename, dos_lbasename, unix_lbasename,
	concat_copy): Mark with attributes nonnull(1) and returns_nonnull.
	(concat, reconcat, concat_copy2, choose_temp_base, xstrerror,
	xmalloc, xrealloc, xcalloc, xstrdup, xstrndup, xmemdup, pex_init):
	Mark with attribute returns_nonnull.

libiberty/
	* concat.c: Remove note about xmalloc.

From-SVN: r204159