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| 1 | # ulonglong.m4 serial 4
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| 2 | dnl Copyright (C) 1999-2004 Free Software Foundation, Inc.
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| 3 | dnl This file is free software, distributed under the terms of the GNU
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| 4 | dnl General Public License. As a special exception to the GNU General
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| 5 | dnl Public License, this file may be distributed as part of a program
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| 6 | dnl that contains a configuration script generated by Autoconf, under
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| 7 | dnl the same distribution terms as the rest of that program.
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| 8 |
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| 9 | dnl From Paul Eggert.
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| 10 |
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| 11 | # Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
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| 12 |
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| 13 | AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG],
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| 14 | [
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| 15 | AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
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| 16 | [AC_TRY_LINK([unsigned long long ull = 1ULL; int i = 63;],
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| 17 | [unsigned long long ullmax = (unsigned long long) -1;
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| 18 | return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
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| 19 | ac_cv_type_unsigned_long_long=yes,
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| 20 | ac_cv_type_unsigned_long_long=no)])
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| 21 | if test $ac_cv_type_unsigned_long_long = yes; then
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| 22 | AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
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| 23 | [Define if you have the 'unsigned long long' type.])
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| 24 | fi
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| 25 | ])
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