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annotate m4/parse-datetime.m4 @ 16364:89227b989588

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fatal-signal: use C prototypes (with explicit void). * lib/fatal-signal.c (uninstall_handlers, install_handlers) (init_fatal_signal_set, block_fatal_signals): Fix signatures.
author Akim Demaille <demaille@gostai.com>
date Wed, 08 Feb 2012 10:36:20 +0100
parents 8250f2777afc
children b9ca6af780f5
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1 # parse-datetime.m4 serial 19
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2 dnl Copyright (C) 2002-2006, 2008-2012 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl Define HAVE_COMPOUND_LITERALS if the C compiler supports compound literals
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8 dnl as in ISO C99.
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9 dnl Note that compound literals such as (struct s) { 3, 4 } can be used for
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10 dnl initialization of stack-allocated variables, but are not constant
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11 dnl expressions and therefore cannot be used as initializer for global or
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12 dnl static variables (even though gcc supports this in pre-C99 mode).
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13 AC_DEFUN([gl_C_COMPOUND_LITERALS],
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14 [
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15 AC_CACHE_CHECK([for compound literals], [gl_cv_compound_literals],
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16 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[struct s { int i, j; };]],
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17 [[struct s t = (struct s) { 3, 4 };
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18 if (t.i != 0) return 0;]])],
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19 gl_cv_compound_literals=yes,
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20 gl_cv_compound_literals=no)])
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21 if test $gl_cv_compound_literals = yes; then
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22 AC_DEFINE([HAVE_COMPOUND_LITERALS], [1],
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23 [Define if you have compound literals.])
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24 fi
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25 ])
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26
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27 AC_DEFUN([gl_PARSE_DATETIME],
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28 [
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29 dnl Prerequisites of lib/parse-datetime.h.
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30 AC_REQUIRE([AM_STDBOOL_H])
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31 AC_REQUIRE([gl_TIMESPEC])
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32
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33 dnl Prerequisites of lib/parse-datetime.y.
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34 AC_REQUIRE([gl_BISON])
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35 AC_REQUIRE([gl_C_COMPOUND_LITERALS])
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36 AC_STRUCT_TIMEZONE
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37 AC_REQUIRE([gl_CLOCK_TIME])
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38 AC_REQUIRE([gl_TM_GMTOFF])
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39 AC_COMPILE_IFELSE(
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40 [AC_LANG_SOURCE([[
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41 #include <time.h> /* for time_t */
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42 #include <limits.h> /* for CHAR_BIT, LONG_MIN, LONG_MAX */
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43 #define TYPE_MINIMUM(t) \
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44 ((t) ((t) 0 < (t) -1 ? (t) 0 : ~ TYPE_MAXIMUM (t)))
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45 #define TYPE_MAXIMUM(t) \
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46 ((t) ((t) 0 < (t) -1 \
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47 ? (t) -1 \
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48 : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
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49 typedef int verify_min[2 * (LONG_MIN <= TYPE_MINIMUM (time_t)) - 1];
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50 typedef int verify_max[2 * (TYPE_MAXIMUM (time_t) <= LONG_MAX) - 1];
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51 ]])],
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52 [AC_DEFINE([TIME_T_FITS_IN_LONG_INT], [1],
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53 [Define to 1 if all 'time_t' values fit in a 'long int'.])
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54 ])
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55 ])