[libstdc++v3] target-specific cpu_limits.h for mingw32 -Take 2.

[Danny Smith]

 Attached patch puts mingw32-specific cpu_limits.h file in
config/os/mingw32, over-riding the the default i386 version.

The handling of qNaN, sNaN, Inf and denorm_min is based on that in the
STLPort library.  I have left out long double support for now, since
mingw's C run-time math library treats long doubles as doubles anyway, and
the FPU is set to 64-bits precision at CRT startup.

I have put the helper class __iec559_consts in global namespace.
Perhaps they should be in namespace std. 

Tested on i586-pc-mingw32, with GCC 3.2 bootstrapped as: 

Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=mingw32 --target=mingw32 --prefix=/mingw --enable-sjlj-exceptions
--enable-threads --disable-nls --enable-languages=f77,c++
--disable-win32-registry --disable-shared
Thread model: win32
gcc version 3.2 20020401 (experimental).

Diff and new file attached.  

OK for mainline?  If not, what needs to be fixed?

Danny

ChangeLog

2002-04-3  Danny Smith  <dannysmith@users.sourceforge.net>

	* libstdc++-v3/configure.target (CPULIMITSH): Set to
	config/os/mingw32 for i?86-*-mingw32*.
	* libstdc++-v3/config/os/mingw32/bits/cpu_limits.h:
	New file.




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