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1 | # longlong.m4 serial 5 |
2 | dnl Copyright (C) 1999-2004 Free Software Foundation, Inc. | |
3 | dnl This file is free software; the Free Software Foundation | |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | dnl From Paul Eggert. | |
8 | ||
9 | # Define HAVE_LONG_LONG if 'long long' works. | |
10 | ||
11 | AC_DEFUN([gl_AC_TYPE_LONG_LONG], | |
12 | [ | |
13 | AC_CACHE_CHECK([for long long], ac_cv_type_long_long, | |
14 | [AC_TRY_LINK([long long ll = 1LL; int i = 63;], | |
15 | [long long llmax = (long long) -1; | |
16 | return ll << i | ll >> i | llmax / ll | llmax % ll;], | |
17 | ac_cv_type_long_long=yes, | |
18 | ac_cv_type_long_long=no)]) | |
19 | if test $ac_cv_type_long_long = yes; then | |
20 | AC_DEFINE(HAVE_LONG_LONG, 1, | |
21 | [Define if you have the 'long long' type.]) | |
22 | fi | |
23 | ]) |