configure: abort if dirs with spaces are used

Abort early if the source directory, build directory, or prefix
contains spaces (either the supplied directory, or the canonicalized
version of the directory).  This prevents users from getting cryptic
errors later in configure and/or make.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit 8841b124895fd77871125d9031555ba9b11efa4c)

configure.ac

@@ -111,6 +111,26 @@ AM_SILENT_RULES([yes])
 # Make configure depend on the VERSION file, since it's used in AC_INIT
 AC_SUBST([CONFIGURE_DEPENDENCIES], ['$(top_srcdir)/VERSION'])
 
+# Sanity checks
+AC_DEFUN([OMPI_CHECK_DIR_FOR_SPACES],[
+    dir="$1"
+    article="$2"
+    label="$3"
+
+    AC_MSG_CHECKING([directory of $label])
+    AC_MSG_RESULT([$dir])
+    AS_IF([test -n "`echo $dir | grep ' '`"],
+          [AC_MSG_WARN([This version of Open MPI does not support $article $label])
+           AC_MSG_WARN([with a path that contains spaces])
+           AC_MSG_ERROR([Cannot continue.])])
+])
+
+OMPI_CHECK_DIR_FOR_SPACES([$srcdir], [a], [source tree])
+OMPI_CHECK_DIR_FOR_SPACES([`readlink -f $srcdir`], [an], [absolute source tree])
+OMPI_CHECK_DIR_FOR_SPACES([`readlink -f .`], [a], [build tree])
+OMPI_CHECK_DIR_FOR_SPACES([$prefix], [a], [prefix])
+OMPI_CHECK_DIR_FOR_SPACES([`readlink -f $prefix`], [an], [absolute prefix])
+
 opal_show_subtitle "Checking versions"
 
 # Get the version of OMPI that we are installing