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changeset 1894:f80f058b943b

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(jm_AC_TYPE_UNSIGNED_LONG_LONG): Make sure that we can shift, multiply and divide unsigned long long values; Ultrix cc can't do it.
author Jim Meyering <jim@meyering.net>
date Sun, 01 Aug 1999 08:47:11 +0000
parents 70bc8fe03cad
children 36b9dcb0dc9e
files m4/ulonglong.m4
diffstat 1 files changed, 4 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- 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