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https://issues.apache.org/jira/browse/STDCXX-464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor resolved STDCXX-464.
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Resolution: Won't Fix
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.
> [HP-UX 11.23] std::num_put drops sign from negative long double NaN
> -------------------------------------------------------------------
>
> Key: STDCXX-464
> URL: https://issues.apache.org/jira/browse/STDCXX-464
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 22. Localization
> Affects Versions: 4.1.3, 4.2.0
> Environment: HP-UX 11.23 and prior
> Reporter: Martin Sebor
> Assignee: Martin Sebor
> Priority: Minor
> Fix For: 4.2.1
>
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> 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}
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