[svn-r7047] Purpose:

Improvement

Description:
If $CXX is not defined, configure will try a list of possible
C++ compiler name.  That is not always desireable.

Solution:
Change configure to combine all powerpc-ibm-aix* to one version.
Add xlC as the default $CXX value.

Platforms tested:
Tested in Copper only since the change affect AIX machine only.

Misc. update:

c++/config/powerpc-ibm-aix

@@ -0,0 +1,10 @@
+#							-*- shell-script -*-
+#
+# This file is part of the HDF5 build script.  It is processed shortly
+# after configure starts and defines, among other things, flags for
+# the various compile modes.
+#
+# See BlankForm in this directory for details.
+
+# Use AIX supplied C++ compiler by default.
+CXX=${CXX=xlC}

c++/configure

@@ -1585,8 +1585,8 @@ echo "$as_me: error: config.cache file is invalid" >&2;}
 fi
 
 case "$host_os" in
-  aix4.*)
-    host_os_novers=aix4.x
+  aix*)
+    host_os_novers=aix
     ;;
   freebsd*)
     host_os_novers=freebsd

c++/configure.in

@@ -84,8 +84,8 @@ dnl
 dnl If the `OS' ends with a version number then remove it. For instance,
 dnl `freebsd3.1' would become `freebsd'
 case "$host_os" in
-  aix4.*)
-    host_os_novers=aix4.x
+  aix*)
+    host_os_novers=aix
     ;;
   freebsd*)
     host_os_novers=freebsd