re PR c/20631 (Support -std=c90 as alias for -std=c89)

re PR c/20631 (Support -std=c90 as alias for -std=c89)

2010-02-26  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c/20631
	* doc/cpp.texi: Use c90 instead of c89 and gnu90 instead of gnu89.
	* doc/standards.texi: Likewise.
	* doc/extend.texi: Likewise.
	* doc/trouble.texi: Likewise.
	* doc/cppopts.texi: Likewise.
	* doc/install.texi: Likewise.
	* c.opt (std=c90,std=gnu90): New options.
	* c-opts.c (c_common_handle_option): Handle them.
testsuite/
	* gcc.dg/cpp/c90-pedantic.c: New.
	* gcc.dg/cpp/c90.c: New.
	* gcc.dg/gnu90-const-expr-1.c: New.
	* gcc.dg/Woverlength-strings-pedantic-c90.c: New.

From-SVN: r157096