time_r.m4 checks unexpectedly pass on hpux10

[Peter O'Gorman]

Hi,

HP-UX10 has:
int gmtime_r(const time_t *timer, struct tm *result);
int localtime_r(const time_t *timer, struct tm *result);

Which is, as you know, not standards conforming.

However, compiling the test case for reentrant time functions on
hpux10 with its native cc and -Ae results in a compiler warning, not
an error. So the test, unfortunately, passes.

The test case is:
#include <time.h>

int main() {
/* We don't need to append 'restrict's to the argument types,
   even though the POSIX signature has the 'restrict's,   
   since C99 says they can't affect type compatibility.  */
   struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
   if (ptr) return 0;
}

The compile line and warning:
cc -Ae -c lcltimecheck.c -D_REENTRANT             
cc: "lcltimecheck.c", line 7: warning 604: Pointers are not 
assignment-compatible.

Perhaps we should set ac_c_werror_flag=yes before running this test?

Thanks,
Peter