After running autoupdate (GNU Autoconf 2.71), i see in
configure.ac:
m4_warn([obsolete],
[Update your code to rely only on HAVE_SYS_TIME_H,
then remove this warning and the obsolete code below it.
All current systems provide time.h; it need not be checked for.
Not all systems provide sys/time.h, but those that do, all allow
you to include it and time.h simultaneously.])dnl
AC_CHECK_HEADERS_ONCE([sys/time.h])
# Obsolete code to be removed.
if test $ac_cv_header_sys_time_h = yes; then
AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
and <time.h>. This macro is obsolete.])
fi
# End of obsolete code.
Currently, the source code has these stylized blocks:
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
My question is: To upgrade, which is preferred, (a) or (b)?
(a)
#if HAVE_SYS_TIME_H
# include <sys/time.h>
#else
# include <time.h>
#endif
(b)
#if HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <time.h>
The difference is #include <time.h> is unconditional in (b),
which is OK according to my reading of the warning message
above. (Thus, my guess is (b).)
--
Thien-Thi Nguyen -----------------------------------------------
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