[4.5 patch] allow d or D suffix for double for c/39027

[Joseph S. Myers]

On Wed, 25 Feb 2009, Janis Johnson wrote:

> +      /* A suffix for double is a GCC extension via decimal float support.
> +	 If the suffix also specifies an imaginary value we'll catch that
> +	 later.  */
> +      if ((result == CPP_N_MEDIUM) && CPP_PEDANTIC (pfile))
> +	cpp_error (pfile, CPP_DL_WARNING,
> +		   "suffix for double constant is a GCC extension");

This needs to be CPP_DL_PEDWARN not CPP_DL_WARNING since it's a constraint 
violation (6.4#2, "Each preprocessing token that is converted to a token 
shall have the lexical form of a keyword, an identifier, a constant, a 
string literal, or a punctuator.").

> Index: gcc/testsuite/gcc.dg/fltconst-pedantic-double.c

There should be an associated copy of this testcase using -pedantic-errors 
and dg-error in place of dg-warning.

OK for 4.5 and c-4_5-branch with those changes.

-- 
Joseph S. Myers
joseph@codesourcery.com