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

C++ Standard Library

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

Created: 29/Jun/07 02:07 AM Updated: 07/Apr/08 12:13 AM

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Component/s:

22. Localization

Affects Version/s:

4.1.3, 4.2.0

Fix Version/s:

4.2.1

Time Tracking:

Original Estimate:

Remaining Estimate:

Time Spent:

Environment:

HP-UX 11.23 and prior

Issue Links:

Reference

This issue is related to:

STDCXX-51 infinity, NaN formatted differently on different platforms

dependent

This issue depends upon:

STDCXX-463 [HP-UX 11.23] printf("%Lg", -NAN) formatted incorrectly

Severity:	Incorrect Behavior
Resolution Date:	25/Mar/08 05:27 PM

Description

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On HP-UX 11.23 and prior versions of the OS negative long double NaN is formatted without the minus sign:

$ uname -sr && cat t.cpp && nice gmake t && ./t
HP-UX B.11.23
#include <cassert>
#include <iostream>
#include <limits>
#include <sstream>

int main ()
{
    std::ostringstream os;
    os << std::numeric_limits<double>::quiet_NaN () << " == "
       << std::numeric_limits<long double>::quiet_NaN () << '\n'
       << -std::numeric_limits<double>::quiet_NaN () << " == "
       << -std::numeric_limits<long double>::quiet_NaN ();

    std::cout << os.str () << '\n';
    assert (os.str () == "nan == nan\n-nan == -nan");
}

aCC -c -I/amd/devco/sebor/stdcxx/include/ansi -I/usr/include  -D_RWSTDDEBUG    -I/amd/devco/sebor/stdcxx/include -I/build/sebor/stdcxx-aCC-3.73-11s/include -I/amd/devco/sebor/stdcxx/examples/include  -Aa +nostl  -g +d  +w +W392 +W655 +W684 +W818 +W819 +W849   t.cpp
aCC t.o -o t -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings    -L/build/sebor/stdcxx-aCC-3.73-11s/lib  -lstd11s  -lm 
nan == nan
-nan == nan
Assertion failed: os.str () == "nan == nan\n-nan == -nan", file t.cpp, line 15
ABORT instruction (core dumped)

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Martin Sebor made changes - 29/Jun/07 02:08 AM

Field	Original Value	New Value
Link		This issue depends upon STDCXX-463 [ STDCXX-463 ]

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Martin Sebor added a comment - 29/Jun/07 02:08 AM

Caused by the referenced bug in HP-UX printf().

Martin Sebor made changes - 09/Jul/07 12:51 AM

Link

This issue is related to STDCXX-51 [ STDCXX-51 ]

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Martin Sebor added a comment - 23/Aug/07 03:57 PM

This will be hard to fix given that it's caused by a compiler bug. Lowered Priority and deferred to 4.2.1.

Martin Sebor made changes - 23/Aug/07 03:57 PM

Priority	Major [ 3 ]	Minor [ 4 ]
Affects Version/s		4.2 [ 12311945 ]
Fix Version/s		4.2.1 [ 12312690 ]

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Martin Sebor added a comment - 01/Feb/08 04:29 AM

Fixed formatting in Description.
Set Original Estimate and Severity.

Martin Sebor made changes - 01/Feb/08 04:29 AM

Description	On HP-UX 11.23 and prior versions of the OS negative long double NaN is formatted without the minus sign: $ uname -sr && cat t.cpp && nice gmake t && ./t HP-UX B.11.23 #include <cassert> #include <iostream> #include <limits> #include <sstream> int main () { std::ostringstream os; os << std::numeric_limits<double>::quiet_NaN () << " == " << std::numeric_limits<long double>::quiet_NaN () << '\n' << -std::numeric_limits<double>::quiet_NaN () << " == " << -std::numeric_limits<long double>::quiet_NaN (); std::cout << os.str () << '\n'; assert (os.str () == "nan == nan\n-nan == -nan"); } aCC -c -I/amd/devco/sebor/stdcxx/include/ansi -I/usr/include -D_RWSTDDEBUG -I/amd/devco/sebor/stdcxx/include -I/build/sebor/stdcxx-aCC-3.73-11s/include -I/amd/devco/sebor/stdcxx/examples/include -Aa +nostl -g +d +w +W392 +W655 +W684 +W818 +W819 +W849 t.cpp aCC t.o -o t -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings -L/build/sebor/stdcxx-aCC-3.73-11s/lib -lstd11s -lm nan == nan -nan == nan Assertion failed: os.str () == "nan == nan\n-nan == -nan", file t.cpp, line 15 ABORT instruction (core dumped)	On HP-UX 11.23 and prior versions of the OS negative long double NaN is formatted without the minus sign: {code} $ uname -sr && cat t.cpp && nice gmake t && ./t HP-UX B.11.23 #include <cassert> #include <iostream> #include <limits> #include <sstream> int main () { std::ostringstream os; os << std::numeric_limits<double>::quiet_NaN () << " == " << std::numeric_limits<long double>::quiet_NaN () << '\n' << -std::numeric_limits<double>::quiet_NaN () << " == " << -std::numeric_limits<long double>::quiet_NaN (); std::cout << os.str () << '\n'; assert (os.str () == "nan == nan\n-nan == -nan"); } {code} {noformat} aCC -c -I/amd/devco/sebor/stdcxx/include/ansi -I/usr/include -D_RWSTDDEBUG -I/amd/devco/sebor/stdcxx/include -I/build/sebor/stdcxx-aCC-3.73-11s/include -I/amd/devco/sebor/stdcxx/examples/include -Aa +nostl -g +d +w +W392 +W655 +W684 +W818 +W819 +W849 t.cpp aCC t.o -o t -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings -L/build/sebor/stdcxx-aCC-3.73-11s/lib -lstd11s -lm nan == nan -nan == nan Assertion failed: os.str () == "nan == nan\n-nan == -nan", file t.cpp, line 15 ABORT instruction (core dumped) {noformat}
Severity		Incorrect Behavior
Original Estimate		4h [ 14400 ]
Remaining Estimate		4h [ 14400 ]

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Martin Sebor logged work - 25/Mar/08 04:00 PM

Time Worked:	1h
Analyzed and determined it can't be fixed.

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Martin Sebor added a comment - 25/Mar/08 05:27 PM

As noted in STDCXX-463, this is caused by a platform-specific bug: HP aCC doesn't generate negative NaNs on HP-UX/PA-RISC.
There's nothing we can do about it. Closing as Won't Fix.

Martin Sebor made changes - 25/Mar/08 05:27 PM

Resolution		Won't Fix [ 2 ]
Status	Open [ 1 ]	Resolved [ 5 ]

Martin Sebor made changes - 07/Apr/08 12:13 AM

Time Spent		1h [ 3600 ]
Remaining Estimate	4h [ 14400 ]	3h [ 10800 ]