[svn-r8504] Purpose: bug fix

Description:  The HP compiler cannot convert from float-point numbers to unsigned long long
correctly.  It sets the maximal value of unsigned long long as 0x7fffffffffffffff.

Solution:  Skip the conversion test when this happens by testing it during configuration.

Platforms tested:  kelgia(HP-UX 11) and fuss(RH 8)

1 files changed, 42 insertions, 5 deletions

diff --git a/configure.in b/configure.in
index 905f1ee..b42878d 100644
--- a/configure.in
+++ b/configure.in
@@ -2471,21 +2471,21 @@ dnl (This flag should be set for all machines, except for PGI compiler
 dnl where round-up happens when the fraction of float-point value is greater 
 dnl than 0.5.
 dnl
-AC_MSG_CHECKING([if accurately converting floating-point to unsigned long long values works])
+AC_MSG_CHECKING([if accurately roundup converting floating-point to unsigned long long values])
 
 AC_CACHE_VAL([hdf5_cv_fp_to_ullong_bottom_bit_works],
     [AC_TRY_RUN([
     int main(void)
     {
-        float f = 111.60;
+        float  f = 111.60;
         double d = 222.55;
         unsigned long long l1 = (unsigned long long)f;
         unsigned long long l2 = (unsigned long long)d;
         int           ret = 0;
 
-        if(l1 == 112)
+        if(l1 == 112) 
             ret = 1;
-        if(l2 == 223)
+        if(l2 == 223) 
             ret = 1;
 
 done:
@@ -2495,13 +2495,50 @@ done:
 
 if test ${hdf5_cv_fp_to_ullong_bottom_bit_works} = "yes"; then
   AC_DEFINE([FP_TO_ULLONG_BOTTOM_BIT_WORKS], [1],
-            [Define if your system can accurately convert floating-point to unsigned long long values.])
+            [Define if your system roundup accurately convert floating-point to unsigned long long values.])
   AC_MSG_RESULT([yes])
 else
   AC_MSG_RESULT([no])
 fi
 
 dnl ----------------------------------------------------------------------
+dnl Set the flag to indicate that the machine can accurately convert
+dnl 'float' or 'double' to 'unsigned (long) long' values.
+dnl (This flag should be set for all machines, except for HP-UX machines
+dnl where the maximal number for unsigned long long is 0x7fffffffffffffff
+dnl during conversion.
+dnl
+AC_MSG_CHECKING([if right maximum converting floating-point to unsigned long long values])
+
+AC_CACHE_VAL([hdf5_cv_fp_to_ullong_right_maximum],
+    [AC_TRY_RUN([
+    int main(void)
+    {
+        float  f = 9701917572145405952.00f;
+        double d = 9701917572145405952.00;
+        unsigned long long l1 = (unsigned long long)f;
+        unsigned long long l2 = (unsigned long long)d;
+        unsigned long long l3 = 0x7fffffffffffffffLLU;
+        int           ret = 0;
+
+        if(l1 <= l3 || l2 <= l3) 
+            ret = 1;
+
+done:
+        exit(ret);
+    }
+    ], [hdf5_cv_fp_to_ullong_right_maximum=yes], [hdf5_cv_fp_to_ullong_right_maximum=no],)])
+
+if test ${hdf5_cv_fp_to_ullong_right_maximum} = "yes"; then
+  AC_DEFINE([FP_TO_ULLONG_RIGHT_MAXIMUM], [1],
+            [Define if your system has right maximum convert floating-point to unsigned long long values.])
+  AC_MSG_RESULT([yes])
+else
+  AC_MSG_RESULT([no])
+fi
+
+
+dnl ----------------------------------------------------------------------
 dnl Set the flag to indicate that the machine can _compile_
 dnl 'unsigned long long' to 'float' and 'double' typecasts.
 dnl (This flag should be set for all machines, except for under Windows when