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1 dnl ac_var_timeszone_externals.m4
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2
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3 # Define 'timezone', 'altzone' and 'daylight'
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4 # http://www.gnu.org/software/ac-archive/Miscellaneous/ac_var_timezone_externals.html
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5 # Use instead of 'AC_STRUCT_TIMEZONE' to determine whether the
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6 # the external timezone variables 'timezone', 'altzone' and 'daylight' exist,
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7 # defining 'HAVE_TIMEZONE', 'HAVE_ALTZONE' and 'HAVE_DAYLIGHT' respectively
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8 # (as well as gaining the macros defined by 'AC_STRUCT_TIMEZONE').
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9 # Mark R.Bannister <markb@freedomware.co.uk>
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10 AC_DEFUN([AC_VAR_TIMEZONE_EXTERNALS],
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11 [ AC_REQUIRE([AC_STRUCT_TIMEZONE])dnl
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12 AC_CACHE_CHECK(for timezone external, mb_cv_var_timezone,
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13 [ AC_TRY_LINK([#include <time.h>], [return (int)timezone;],
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14 mb_cv_var_timezone=yes,
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15 mb_cv_var_timezone=no)
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16 ])
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17 AC_CACHE_CHECK(for altzone external, mb_cv_var_altzone,
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18 [ AC_TRY_LINK([#include <time.h>], [return (int)altzone;],
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19 mb_cv_var_altzone=yes,
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20 mb_cv_var_altzone=no)
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21 ])
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22 AC_CACHE_CHECK(for daylight external, mb_cv_var_daylight,
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23 [ AC_TRY_LINK([#include <time.h>], [return (int)daylight;],
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24 mb_cv_var_daylight=yes,
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25 mb_cv_var_daylight=no)
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26 ])
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27 if test $mb_cv_var_timezone = yes; then
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28 AC_DEFINE([HAVE_TIMEZONE], 1,
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29 [Define if you have the external 'timezone' variable.])
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30 fi
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31 if test $mb_cv_var_altzone = yes; then
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32 AC_DEFINE([HAVE_ALTZONE], 1,
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33 [Define if you have the external 'altzone' variable.])
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34 fi
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35 if test $mb_cv_var_daylight = yes; then
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36 AC_DEFINE([HAVE_DAYLIGHT], 1,
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37 [Define if you have the external 'daylight' variable.])
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38 fi
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39 ])
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