[svn-r9809] Purpose: bug fix

Description:  For HP-UX11.00, compiler's casting from 'long double' to most of
integers.  A macro was hard set in config/hpux11.00 before.

Solution:  Let configure detect this case and set the macro.

Platforms tested:  kelgia, fuss, modi4.  These systems are mainly concerned.

1 files changed, 54 insertions, 0 deletions

diff --git a/configure b/configure
index 708ff29..1184ee4 100755
--- a/configure
+++ b/configure
@@ -33548,12 +33548,66 @@ else
 echo "${ECHO_T}no" >&6
 fi
 
+
 echo "$as_me:$LINENO: checking if accurately converting from long double to integers works" >&5
 echo $ECHO_N "checking if accurately converting from long double to integers works... $ECHO_C" >&6
+
 if test "${hdf5_cv_sw_ldouble_to_integer_works+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
+  if test "$cross_compiling" = yes; then
+  { { echo "$as_me:$LINENO: error: cannot run test program while cross compiling" >&5
+echo "$as_me: error: cannot run test program while cross compiling" >&2;}
+   { (exit 1); exit 1; }; }
+else
+  cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+    int main(void)
+    {
+        void *align;
+        long double ld= 9701917572145405952.00L;
+        unsigned char v1;
+        short v2;
+        unsigned int v3;
+        int  ret = 0;
+
+        align = (void*)malloc(sizeof(long double));
+        memcpy(align, &ld, sizeof(long double));
+
+        /*For HU-UX11.00, there's floating exception(core dump) when doing some of casting
+         *from 'long double' to integers*/
+        v1=(unsigned char)(*((long double*)align));
+        v2=(short)(*((long double*)align));
+        v3=(unsigned int)(*((long double*)align));
+
+done:
+        exit(ret);
+    }
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
   hdf5_cv_sw_ldouble_to_integer_works=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+( exit $ac_status )
+hdf5_cv_sw_ldouble_to_integer_works=no
+fi
+rm -f core core.* *.core conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
 fi