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Diffstat (limited to 'm4/ulonglong.m4')
| -rw-r--r-- | m4/ulonglong.m4 | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/m4/ulonglong.m4 b/m4/ulonglong.m4 index afc765a3e..e2fbb5526 100644 --- a/m4/ulonglong.m4 +++ b/m4/ulonglong.m4 @@ -1,12 +1,13 @@ -#serial 1 +#serial 2 dnl From Paul Eggert. AC_DEFUN(jm_AC_TYPE_UNSIGNED_LONG_LONG, [ AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long, - [AC_TRY_COMPILE([], - [unsigned long long i = (unsigned long long) -1;], + [AC_TRY_LINK([unsigned long long ull = 1; int i = 63;], + [unsigned long long ullmax = (unsigned long long) -1; + return ull << i | ull >> i | ullmax / ull | ullmax % ull;], ac_cv_type_unsigned_long_long=yes, ac_cv_type_unsigned_long_long=no)]) if test $ac_cv_type_unsigned_long_long = yes; then |