[#STDCXX-51] infinity, NaN formatted differently on different platforms

C++ Standard Library

infinity, NaN formatted differently on different platforms

Created: 15/Oct/05 07:49 AM Updated: 27/May/08 03:31 PM

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Component/s:

22. Localization

Affects Version/s:

4.1.2, 4.1.3, 4.1.4, 4.2.0, 4.2.1

Fix Version/s:

4.2.2

Time Tracking:

Original Estimate:

13h

Remaining Estimate:

Time Spent:

13h

File Attachments:

	File Name	Date Attached	Attached By	Size
	num_put.diff	2008-04-01 06:58 PM	Farid Zaripov	10 kB

Environment:

all

Issue Links:

Dependants

This issue blocks:

~~STDCXX-458~~ limits example output depends on platform

Reference

This issue relates to:

STDCXX-819 [MSVC] numeric_limits::quiet_NaN() and signaling_NaN() bits differ from native STL

~~STDCXX-464~~ [HP-UX 11.23] std::num_put drops sign from negative long double NaN

~~STDCXX-2~~ [MSVC] std::num_put bad formatting of 0.0 with precision and showpoint

Patch Info:	Patch Available
Severity:	Incorrect Behavior

Description

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The output of the program below is different depending on the operating system it runs on. It should be the same (preferably like that on AIX).

$ cat u.cpp && uname -sr && make u -r && ./u
#include <iostream>
#include <limits>

int main ()
{
    std::cout << std::numeric_limits<double>::infinity () << '\n'
              << std::numeric_limits<double>::quiet_NaN () << '\n'
              << std::numeric_limits<double>::signaling_NaN () << '\n'; 
}
SunOS 5.9
gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG   -pthreads -D_RWSTD_USE_CONFIG -I/build/sebor/gcc-3.4.3-15s/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/examples/include  -pedantic -nostdinc++ -g  -Wall -W -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long  u.cpp
gcc u.o -o u -pthreads -L/build/sebor/gcc-3.4.3-15s/lib -lstd15s  -lsupc++ -lm
rm u.o
inf
nan
nan

$ uname -vs && gmake u -r && ./u
AIX 5
xlCcore_r -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/vacpp-7.0.0.3-15D/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/examples/include  -g  -q64  -qtemplateregistry=u.ti   u.cpp
xlCcore_r u.o -o u -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -liconv -brtl   -q64 -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/vacpp-7.0.0.3-15D/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/examples/include  -qtemplateregistry=u.ti -L/build/sebor/vacpp-7.0.0.3-15D/lib -lstd15D   -lm
rm u.o
inf
nanq
nans

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Farid Zaripov logged work - 02/Apr/08 03:12 PM

Time Worked:	13h
Investigated the presence of the functions to detect inf and nan values on different platforms and compilers. Created and tested patch on MSVC, gcc/Linux.