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m4/ulonglong.m4

 

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# ulonglong.m4 serial 4

 

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dnl Copyright (C) 1999-2004 Free Software Foundation, Inc.

 

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dnl This file is free software; the Free Software Foundation

 

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dnl gives unlimited permission to copy and/or distribute it,

 

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dnl with or without modifications, as long as this notice is preserved.

 

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dnl From Paul Eggert.

 

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# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.

 

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AC_DEFUN([gl_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 = 1ULL; 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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