Search code examples
c++linuxgccwarnings

signed:ness optimization "bug" in gcc

my code has a warning and I don't know how to avoid it. Here is a code snippet

#include <arpa/inet.h>
int main(void) {
        uint16_t portnbr=0;
        uint16_t n_portnbr = htons(portnbr);
        return n_portnbr;
}

Compiler:

/usr/bin/g++ -Wconversion -Wall  -O2 a.cpp

Output:

a.cpp:4: warning: conversion to 'short unsigned int' from 'int' may alter its value

Is it possible to avoid the warning? No option to modify the CFLAGS.

My compiler is gcc version 4.3.4 [gcc-4_3-branch revision 152973] (SUSE Linux)

Solution

  • This appears to be a bug in glibc. See this bug report.