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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-624) [gcc/Linux] std::numeric_limits<int>traps = false when integer arithmetic traps
Date Mon, 29 Oct 2007 23:35:51 GMT
[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: Mark Brown
            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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