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| 1 | #serial 2
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| 2 |
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| 3 | dnl From Paul Eggert.
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| 4 |
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| 5 | AC_DEFUN(jm_AC_TYPE_UNSIGNED_LONG_LONG,
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| 6 | [
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| 7 | AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
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| 8 | [AC_TRY_LINK([unsigned long long ull = 1; int i = 63;],
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| 9 | [unsigned long long ullmax = (unsigned long long) -1;
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| 10 | return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
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| 11 | ac_cv_type_unsigned_long_long=yes,
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| 12 | ac_cv_type_unsigned_long_long=no)])
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| 13 | if test $ac_cv_type_unsigned_long_long = yes; then
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| 14 | AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
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| 15 | [Define if you have the unsigned long long type.])
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| 16 | fi
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| 17 | ])
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