* c-decl.c (c_decode_option): Give deprecation warning for
	-traditional.
	* doc/invoke.texi (-traditional): Note that this option is
	deprecated.

testsuite:
	* gcc.dg/cpp/assert_trad1.c, gcc.dg/cpp/tr-paste.c,
	gcc.dg/cpp/tr-str.c: Use -traditional-cpp instead of -traditional.
	* gcc.dg/ext-glob.c: Expect -traditional deprecation warning.

From-SVN: r47147