Fix for ticket #179. Print a reasonable error message if we fail to parse

the compiler data file.  Also, actually fix the bug by expanding out
datarootdir before letting it get in install_dirs.h.

This commit was SVN r10643.

config/ompi_install_dirs.m4

@@ -27,12 +27,14 @@
 AC_DEFUN([OMPI_INSTALL_DIRS], [
     ompi_exec_prefix_save="$exec_prefix"
     ompi_prefix_save="$prefix"
+    ompi_datarootdir_save="$datarootdir"
 
     # need to temporarily expand this out as almost exactly as it will
     # be done later so that NONE doesn't show up in the
     # {exec_}prefix-based variables.
     test "x$prefix" = xNONE && prefix=$ac_default_prefix
     test "x$exec_prefix" = xNONE && exec_prefix="$prefix"
+    eval datarootdir="$datarootdir"
 
     OPAL_PREFIX="$prefix"
     OPAL_EXEC_PREFIX="$exec_prefix"
@@ -64,6 +66,7 @@ AC_DEFUN([OMPI_INSTALL_DIRS], [
 
     prefix="$ompi_prefix_save"
     exec_prefix="$ompi_exec_prefix_save"
+    datarootdir="$ompi_datarootdir_save"
 
     AC_CONFIG_FILES([$1])
 ])dnl

opal/tools/wrappers/opal_wrapper.c

@@ -43,6 +43,7 @@
 #include "opal/runtime/opal.h"
 #include "opal/constants.h"
 #include "opal/util/argv.h"
+#include "opal/util/error.h"
 #include "opal/util/keyval_parse.h"
 #include "opal/util/show_help.h"
 #include "opal/util/path.h"
@@ -295,6 +296,7 @@ main(int argc, char *argv[])
 
     base_argv0 = strdup(basename(argv[0]));
     if (OPAL_SUCCESS != (ret = data_init(base_argv0))) {
+        fprintf(stderr, "Error parsing data file: %s\n", opal_strerror(ret));
         return ret;
     }