gcc issues warning when using the tolower function along with an optimization
flag. This warning also happens in other versions of gcc apart from 4.4.2
gcc -std=c99 -pedantic -O2 -Wall -Wunreachable-code a.c
a.c:13: warning: will never be executed
#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(void)
{
char A[50] = "";
strcat(A, "Hello World!");
int COUNT = 0;
while(A[COUNT])
{
A[COUNT] = (char)(tolower(A[COUNT])); // this line issues warning
COUNT++;
}
puts(A); // output: hello world!
return 0;
}
--
Summary: gcc issues warning with tolower function with
optimization flag
Product: gcc
Version: 4.4.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: joe dot bassis at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42406
