RFC [libstdc++v3] target-specific cpu_limits.h

[Danny Smith <danny_r_smith_2001 at yahoo dot co dot nz>]

I note that files cpu-limits.h in various libstdc++-v3/config/cpu/*/bits/
dirs don't have much to say about fp environment, other than size of long
double. 

In local build tree I have added following file in cpu subdir as
libstdc++-v3/config/cpu/i386/mingw32/bits/cpu-limits.h and modified
configure.target accordingly. The file defines constants based on the
default behavior of native C-runtime (default i387 fpu mode is set at CRT
startup).   

My question: Is this the place to add these defines?  Can I put something
like this (after more testing and discussion with other mingw developers)
in FSF tree?

Here is the file:

// Copyright (C) 2001, 2002 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
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you
compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

#ifndef _GLIBCPP_CPU_LIMITS
#define _GLIBCPP_CPU_LIMITS 1

extern const float __QNANF, __SNANF, __INFF, __DENORMF;
extern const double __QNAN, __SNAN, __INF, __DENORM;

#define __glibcpp_long_double_bits 64

// float
#define __glibcpp_float_has_infinity true
#define __glibcpp_float_has_quiet_NaN true
#define __glibcpp_float_has_signaling_NaN true
#define __glibcpp_float_has_denorm denorm_present
#define __glibcpp_float_has_denorm_loss true
#define __glibcpp_float_infinity __INFF
#define __glibcpp_float_quiet_NaN __QNANF
#define __glibcpp_float_signaling_NaN __SNANF
#define __glibcpp_float_denorm_min __DENORMF
#define __glibcpp_float_is_iec559 true
#define __glibcpp_float_is_bounded true
#define __glibcpp_float_is_modulo false
#define __glibcpp_float_traps true
#define __glibcpp_float_tinyness_before true
#define __glibcpp_float_round_style round_to_nearest

// double

#define __glibcpp_double_has_infinity true
#define __glibcpp_double_has_quiet_NaN true
#define __glibcpp_double_has_signaling_NaN true
#define __glibcpp_double_has_denorm denorm_present
#define __glibcpp_double_has_denorm_loss true
#define __glibcpp_double_infinity __INF
#define __glibcpp_double_quiet_NaN  __QNAN
#define __glibcpp_double_signaling_NaN  __SNAN
#define __glibcpp_double_denorm_min __DENORM
#define __glibcpp_double_is_iec559 true
#define __glibcpp_double_is_bounded true
#define __glibcpp_double_is_modulo false
#define __glibcpp_double_traps true
#define __glibcpp_double_tinyness_before true
#define __glibcpp_double_round_style round_to_nearest

#endif

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