Fixes trac:1338: Have the MCA base specifically check for all requested

components.  If they are not found / able to be opened, a warning will
be printed and the mca_base_component_find() will return
OPAL_ERR_NOT_FOUND.  It is the upper-layer's responsibility to handle
this error appropriately.

This commit was SVN r18707.

The following Trac tickets were found above:
  Ticket 1338 --> https://svn.open-mpi.org/trac/ompi/ticket/1338

opal/mca/base/help-mca-base.txt

@@ -10,6 +10,7 @@
 #                         University of Stuttgart.  All rights reserved.
 # Copyright (c) 2004-2005 The Regents of the University of California.
 #                         All rights reserved.
+# Copyright (c) 2008      Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 # 
 # Additional copyrights may follow
@@ -29,12 +30,18 @@ output of the "ompi_info" command and ensure that components of this
 type are available on your system.  You may also wish to check the
 value of the "component_path" MCA parameter and ensure that it has at
 least one directory that contains valid MCA components.
-
+#
 [find-available:not-valid]
-The %s component was not found!
+A requested component was not found, or was unable to be opened.  This
+means that this component is either not installed or is unable to be
+used on your system (e.g., sometimes this means that shared libraries
+that the component requires are unable to be found/loaded).  Note that
+Open MPI stopped checking at the first component that it did not find.
 
-This means that this component is either not installed, or unable to be 
-used on your system.
+Host:      %s
+Framework: %s
+Component: %s
+#
 [framework-param:too-many-negates]
 MCA framework parameters can only take a single negation operator
 ("^"), and it must be at the beginning of the value.  The following

opal/mca/base/mca_base_component_find.c

@@ -23,12 +23,14 @@
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #if OMPI_WANT_LIBLTDL
 #include "opal/libltdl/ltdl.h"
 #endif
 
 #include "opal/util/output.h"
+#include "opal/util/show_help.h"
 #include "opal/class/opal_list.h"
 #include "opal/mca/mca.h"
 #include "opal/mca/base/base.h"
@@ -132,6 +134,7 @@ int mca_base_component_find(const char *directory, const char *type,
                             bool open_dso_components)
 {
     int i;
+    opal_list_item_t *item;
     mca_base_component_list_item_t *cli;
 
     /* Find all the components that were statically linked in */
@@ -168,6 +171,30 @@ int mca_base_component_find(const char *directory, const char *type,
     }
 #endif
 
+    /* Ensure that *all* requested components exist.  Print a warning
+       and abort if they do not. */
+    for (i = 0; NULL != requested_component_names && 
+             NULL != requested_component_names[i]; ++i) {
+        for (item = opal_list_get_first(found_components);
+             opal_list_get_end(found_components) != item; 
+             item = opal_list_get_next(item)) {
+            cli = (mca_base_component_list_item_t*) item;
+            if (0 == strcmp(requested_component_names[i], 
+                            cli->cli_component->mca_component_name)) {
+                break;
+            }
+        }
+
+        if (opal_list_get_end(found_components) == item) {
+            char h[HOST_NAME_MAX];
+            gethostname(h, sizeof(h));
+            opal_show_help("help-mca-base.txt", 
+                           "find-available:not-valid", true,
+                           h, type, requested_component_names[i]);
+            return OPAL_ERR_NOT_FOUND;
+        }
+    }
+
     /* All done */
 
     return OPAL_SUCCESS;