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23 lines
909 B
23 lines
909 B
# 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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