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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-624) [gcc/Linux] std::numeric_limits<int>traps = false when integer arithmetic traps
Date Mon, 29 Oct 2007 23:37:50 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-624?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor updated STDCXX-624:
--------------------------------

    Assignee: Martin Sebor  (was: Mark Brown)

Reassigning to self after accidentally assigning it to Mark.

> [gcc/Linux] std::numeric_limits<int>traps = false when integer arithmetic traps
> -------------------------------------------------------------------------------
>
>                 Key: STDCXX-624
>                 URL: https://issues.apache.org/jira/browse/STDCXX-624
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 18. Language Support
>    Affects Versions: 4.2
>         Environment: gcc 4.1.0 on SUSE Linux Enterprise Server 10 (x86_64)
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>            Priority: Trivial
>             Fix For: 4.2.1
>
>
> As an extension, stdcxx defines the value of std::numeric_limits<T>::traps for
integer T to be true when there exists an arithmetic operation on type T that traps for some
value of T. Based on this definition the program below should always run successfully to completion
but when compiled with gcc 4.1.0 with optimization enabled on SUSE Linux Enterprise Server
10 (x86_64) it aborts at runtime. (This is also why the example program limits.cpp produces
a DIFF result in some builds).
> $ cat t.cpp && make t && ./t
> #include <cassert>
> #include <cstdio>
> #include <cstdlib>
> #include <limits>
> char digits[] = " +0.?23456789e+01";
> int main ()
> {
>     digits [4] = '0';
>     const int zero = (int)std::strtod (digits, 0);
>     digits [4] = '1';
>     const int x = (int)std::strtod (digits, 0);
>     if (!std::numeric_limits<int>::traps) {
>         const int div = x / zero;
>         const int mod = x % zero;
>         std::printf ("%d, %d\n", div, mod);
>     }
> }
> gcc -c -I/amd/devco/sebor/stdcxx-4.2.x/include/ansi   -pthread -I/amd/devco/sebor/stdcxx-4.2.x/include
-I/build/sebor/stdcxx-4.2.x-gcc-4.1.0-12D/include -I/amd/devco/sebor/stdcxx-4.2.x/examples/include
 -pedantic -nostdinc++ -O2   -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long
-Wcast-align   t.cpp
> gcc t.o -o t -pthread  -L/build/sebor/stdcxx-4.2.x-gcc-4.1.0-12D/lib  -Wl,-R/build/sebor/stdcxx-4.2.x-gcc-4.1.0-12D/lib
-lstd12D -lsupc++ -lm 
> Floating point exception

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