libfabric: pass the appropriate LDFLAGS to libfabric components

When compiling against an external libfabric, ensure to also pass the
appropriate -L flags so that the compiler/linker can find it.

ompi/mca/mtl/ofi/Makefile.am

@@ -1,7 +1,7 @@
 #
 # Copyright (c) 2013-2014 Intel, Inc. All rights reserved
 #
-# Copyright (c) 2014 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2014-2015 Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -45,8 +45,10 @@ endif
 mcacomponentdir = $(ompilibdir)
 mcacomponent_LTLIBRARIES = $(component_install)
 mca_mtl_ofi_la_SOURCES = $(mtl_ofi_sources)
+mca_mtl_ofi_la_LDFLAGS = \
+        $(opal_common_libfabric_LDFLAGS) \
+        -module -avoid-version
 mca_mtl_ofi_la_LIBADD = $(opal_common_libfabric_LIBADD)
-mca_mtl_ofi_la_LDFLAGS = -module -avoid-version
 
 noinst_LTLIBRARIES = $(component_noinst)
 libmca_mtl_ofi_la_SOURCES = $(mtl_ofi_sources)

opal/mca/btl/usnic/Makefile.am

@@ -11,7 +11,7 @@
 #                         All rights reserved.
 # Copyright (c) 2006      Sandia National Laboratories. All rights
 #                         reserved.
-# Copyright (c) 2010-2014 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2010-2015 Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -88,7 +88,9 @@ endif
 mcacomponentdir = $(opallibdir)
 mcacomponent_LTLIBRARIES = $(component)
 mca_btl_usnic_la_SOURCES = $(component_sources)
-mca_btl_usnic_la_LDFLAGS = -module -avoid-version
+mca_btl_usnic_la_LDFLAGS = \
+        $(opal_common_libfabric_LDFLAGS) \
+        -module -avoid-version
 mca_btl_usnic_la_LIBADD = $(opal_common_libfabric_LIBADD)
 
 noinst_LTLIBRARIES = $(lib)

opal/mca/common/libfabric/configure.m4

@@ -50,6 +50,7 @@ AC_DEFUN([MCA_opal_common_libfabric_CONFIG],[
 
     # This is for components that build with libfabric support
     AC_SUBST(opal_common_libfabric_CPPFLAGS)
+    AC_SUBST(opal_common_libfabric_LDFLAGS)
     AC_SUBST(opal_common_libfabric_LIBADD)
 
     # This is for building the libfabric component itself
@@ -294,6 +295,7 @@ AC_DEFUN([_OPAL_COMMON_LIBFABRIC_SETUP_LIBFABRIC_EXTERNAL],[
                        [opal_common_libfabric_happy=1],
                        [opal_common_libfabric_happy=0])
 
+     opal_common_libfabric_LDFLAGS="-L$opal_libfabric_libdir"
      opal_common_libfabric_LIBADD="-lfabric"
 ])