On Mon, 7 Mar 2011, Josà Luis GarcÃa Pallero wrote:
Hello,
In this example:
#include<stdlib.h>
#include<string.h>
int main() {
strspn("hello","h");
return 0;
}
I obtain a warning as:
test.c:4:5: warning: conversion to âsize_tâ from âintâ may change the
sign of the result
If I compile the program with the options:
gcc -Wconversion -O test.c -o test
Note that your example can be reduced to:
int main() {
(0 ? ((void) (0), 0) : 1u) ;
return 0;
}
Not a most useful warning indeed...
The warning appears with -O, -O1, -O2 and -O3, but not with -O0.
glibc includes different code when __OPTIMIZE__ is defined.
--
Marc Glisse
