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18 lines
570 B
Plaintext
18 lines
570 B
Plaintext
#serial 2
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dnl From Paul Eggert.
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AC_DEFUN(jm_AC_TYPE_UNSIGNED_LONG_LONG,
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[
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AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
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[AC_TRY_LINK([unsigned long long ull = 1; int i = 63;],
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[unsigned long long ullmax = (unsigned long long) -1;
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return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
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ac_cv_type_unsigned_long_long=yes,
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ac_cv_type_unsigned_long_long=no)])
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if test $ac_cv_type_unsigned_long_long = yes; then
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AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
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[Define if you have the unsigned long long type.])
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fi
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])
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