PR c/39581
	* c-decl.c (global_bindings_p): Return negative value.
	(c_variable_size): New.  Based on variable_size from
	stor-layout.c.
	(grokdeclarator): Call c_variable_size not variable_size.

testsuite:
	* gcc.dg/c99-const-expr-14.c, gcc.dg/gnu99-const-expr-4.c,
	gcc.dg/vla-21.c: New tests.

From-SVN: r146806