Description of problem:
strdup() not declared in string.h contrary to man 3 strdup

Version-Release number of selected component (if applicable):
glibc-headers-2.3.3-46
gcc35-3.5.0-0.9
gcc-3.4.1-9

How reproducible:
100%

Steps to Reproduce:
1.

ellson@ontap:~> cat bug.c
#include <string.h>
int main() {
        char *a = "abc";
        char *b = strdup(a);
        return (strcmp(a,b));
}
ellson@ontap:~> gcc35 -std=c99 bug.c
bug.c: In function `main':
bug.c:4: warning: implicit declaration of function 'strdup'
bug.c:4: warning: initialization makes pointer from integer without a cast
ellson@ontap:~>

2.
3.
  
Actual results:
warning about implicit declaration

Expected results:
no warning

Additional info: