summaryrefslogtreecommitdiff
path: root/config/ulonglong.m4
diff options
context:
space:
mode:
Diffstat (limited to 'config/ulonglong.m4')
-rw-r--r--config/ulonglong.m425
1 files changed, 25 insertions, 0 deletions
diff --git a/config/ulonglong.m4 b/config/ulonglong.m4
new file mode 100644
index 0000000..1da8b80
--- /dev/null
+++ b/config/ulonglong.m4
@@ -0,0 +1,25 @@
+# ulonglong.m4 serial 3
+dnl Copyright (C) 1999-2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License. As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Paul Eggert.
+
+# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
+
+AC_DEFUN([jm_AC_TYPE_UNSIGNED_LONG_LONG],
+[
+ AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
+ [AC_TRY_LINK([unsigned long long ull = 1ULL; 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
+ AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
+ [Define if you have the 'unsigned long long' type.])
+ fi
+])