* c-cppbuiltin.c (c_cpp_builtins): Do not define __GXX_WEAK__ to 1
	if !flag_weak.
	* doc/cpp.texi (__DEPRECATED): Document.
	(__EXCEPTIONS): Likewise.
	(__GXX_WEAK__): Likewise.

	* g++.dg/cpp/weak.C: New test.

From-SVN: r99080