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Member "gcal-4.1/m4/longlong.m4" (22 Jan 2017, 4739 Bytes) of package /linux/misc/gcal-4.1.tar.gz:


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    1 # longlong.m4 serial 17
    2 dnl Copyright (C) 1999-2007, 2009-2017 Free Software Foundation, Inc.
    3 dnl This file is free software; the Free Software Foundation
    4 dnl gives unlimited permission to copy and/or distribute it,
    5 dnl with or without modifications, as long as this notice is preserved.
    6 
    7 dnl From Paul Eggert.
    8 
    9 # Define HAVE_LONG_LONG_INT if 'long long int' works.
   10 # This fixes a bug in Autoconf 2.61, and can be faster
   11 # than what's in Autoconf 2.62 through 2.68.
   12 
   13 # Note: If the type 'long long int' exists but is only 32 bits large
   14 # (as on some very old compilers), HAVE_LONG_LONG_INT will not be
   15 # defined. In this case you can treat 'long long int' like 'long int'.
   16 
   17 AC_DEFUN([AC_TYPE_LONG_LONG_INT],
   18 [
   19   AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
   20   AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
   21      [ac_cv_type_long_long_int=yes
   22       if test "x${ac_cv_prog_cc_c99-no}" = xno; then
   23         ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
   24         if test $ac_cv_type_long_long_int = yes; then
   25           dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
   26           dnl If cross compiling, assume the bug is not important, since
   27           dnl nobody cross compiles for this platform as far as we know.
   28           AC_RUN_IFELSE(
   29             [AC_LANG_PROGRAM(
   30                [[@%:@include <limits.h>
   31                  @%:@ifndef LLONG_MAX
   32                  @%:@ define HALF \
   33                           (1LL << (sizeof (long long int) * CHAR_BIT - 2))
   34                  @%:@ define LLONG_MAX (HALF - 1 + HALF)
   35                  @%:@endif]],
   36                [[long long int n = 1;
   37                  int i;
   38                  for (i = 0; ; i++)
   39                    {
   40                      long long int m = n << i;
   41                      if (m >> i != n)
   42                        return 1;
   43                      if (LLONG_MAX / 2 < m)
   44                        break;
   45                    }
   46                  return 0;]])],
   47             [],
   48             [ac_cv_type_long_long_int=no],
   49             [:])
   50         fi
   51       fi])
   52   if test $ac_cv_type_long_long_int = yes; then
   53     AC_DEFINE([HAVE_LONG_LONG_INT], [1],
   54       [Define to 1 if the system has the type 'long long int'.])
   55   fi
   56 ])
   57 
   58 # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
   59 # This fixes a bug in Autoconf 2.61, and can be faster
   60 # than what's in Autoconf 2.62 through 2.68.
   61 
   62 # Note: If the type 'unsigned long long int' exists but is only 32 bits
   63 # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
   64 # will not be defined. In this case you can treat 'unsigned long long int'
   65 # like 'unsigned long int'.
   66 
   67 AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
   68 [
   69   AC_CACHE_CHECK([for unsigned long long int],
   70     [ac_cv_type_unsigned_long_long_int],
   71     [ac_cv_type_unsigned_long_long_int=yes
   72      if test "x${ac_cv_prog_cc_c99-no}" = xno; then
   73        AC_LINK_IFELSE(
   74          [_AC_TYPE_LONG_LONG_SNIPPET],
   75          [],
   76          [ac_cv_type_unsigned_long_long_int=no])
   77      fi])
   78   if test $ac_cv_type_unsigned_long_long_int = yes; then
   79     AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
   80       [Define to 1 if the system has the type 'unsigned long long int'.])
   81   fi
   82 ])
   83 
   84 # Expands to a C program that can be used to test for simultaneous support
   85 # of 'long long' and 'unsigned long long'. We don't want to say that
   86 # 'long long' is available if 'unsigned long long' is not, or vice versa,
   87 # because too many programs rely on the symmetry between signed and unsigned
   88 # integer types (excluding 'bool').
   89 AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
   90 [
   91   AC_LANG_PROGRAM(
   92     [[/* For now, do not test the preprocessor; as of 2007 there are too many
   93          implementations with broken preprocessors.  Perhaps this can
   94          be revisited in 2012.  In the meantime, code should not expect
   95          #if to work with literals wider than 32 bits.  */
   96       /* Test literals.  */
   97       long long int ll = 9223372036854775807ll;
   98       long long int nll = -9223372036854775807LL;
   99       unsigned long long int ull = 18446744073709551615ULL;
  100       /* Test constant expressions.   */
  101       typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
  102                      ? 1 : -1)];
  103       typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
  104                      ? 1 : -1)];
  105       int i = 63;]],
  106     [[/* Test availability of runtime routines for shift and division.  */
  107       long long int llmax = 9223372036854775807ll;
  108       unsigned long long int ullmax = 18446744073709551615ull;
  109       return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
  110               | (llmax / ll) | (llmax % ll)
  111               | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
  112               | (ullmax / ull) | (ullmax % ull));]])
  113 ])