[v3] long long, c99 support

[Gabriel Dos Reis]

Thanks for doing this.

| + #if defined(_GLIBCPP_USE_C99) && defined(__cplusplus)
| + // Placeholder for declarations in c99 namespace.
| + namespace c99 { };
| + namespace std
| + {
| +   using namespace c99;
| + }
| + #endif

I'd rather have c99 inside std::.  We can't make the assumption that
c99 isn't a sensible user-reserved identifier name (generated codes
tends to looks really ugly).  If afterwards, it turns out that c99 is
really a reserved name, then it is easy to use namespace alias to do
the right thing.  

	namespace std 
	{
	    namespace c99 { }
	    using namespace c99;
	}

(There is no semi-colon after the definition of c99).

| Index: testsuite/26_numerics/c99_macros.cc
| ===================================================================
| RCS file: /cvs/gcc/gcc/libstdc++-v3/testsuite/26_numerics/c99_macros.cc,v
| retrieving revision 1.2
| diff -c -p -r1.2 c99_macros.cc
| *** c99_macros.cc	2001/04/06 19:14:27	1.2
| --- c99_macros.cc	2001/04/20 01:34:34
| ***************
| *** 1,6 ****
|   // 2001-04-06 gdr
|   
| ! // Copyright (C) 1999, 2000 Free Software Foundation, Inc.
|   //
|   // This file is part of the GNU ISO C++ Library.  This library is free
|   // software; you can redistribute it and/or modify it under the
| --- 1,6 ----
|   // 2001-04-06 gdr
|   
| ! // Copyright (C) 2001 Free Software Foundation, Inc.

Oops.  That was the result of a sloppy copy-n-paste :-(


|   //
|   // This file is part of the GNU ISO C++ Library.  This library is free
|   // software; you can redistribute it and/or modify it under the
| ***************
| *** 29,35 ****
|   
|   // { dg-do compile }
|   
| ! #include <math.h>
|   
|   void fpclassify() { }
|   
| --- 29,35 ----
|   
|   // { dg-do compile }
|   
| ! #include <cmath>

Well, I prefer to leave <math.h> as is: to test C++ as proper.
One add additional test for testing <cmath> but the test with <math.h>
should not be removed.

Thanks,

-- Gaby