http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53277
Bug #: 53277
Summary: Warning using -Wconversion and -Ox in gcc 4.5, 4.6 and
4.7 but not in previous releases
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: [email protected]
ReportedBy: [email protected]
Hello:
In this example:
#include<stdlib.h>
#include<string.h>
int main() {
strspn("hello","h");
return 0;
}
I obtain the warning:
test.c:4:5: warning: conversion to ‘size_t’ from ‘int’ may change the sign of
the result [-Wsign-conversion]
using the order:
gcc -Wall -Wextra -Wconversion -O test.c -o test
The warning appears with -O, -O1, -O2 and -O3, but not with -O0. The
warning appears in gcc 4.5, 4.6 and 4.7 but not in previous releases.
This behavior appears too if I do some assign:
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
size_t x;
x = strspn("hello","h");
printf("%zd\n", x);
return 0;
}
I think this is a bug
Cheers
