Work around Automake not knowing how to properly configure libtool to build

Objective C libraries

Refs trac:483

This commit was SVN r12080.

The following Trac tickets were found above:
  Ticket 483 --> https://svn.open-mpi.org/trac/ompi/ticket/483

orte/mca/pls/xgrid/Makefile.am

@@ -18,11 +18,22 @@
 
 # Use the top-level Makefile.options
 
-
-
 AM_CPPFLAGS = -I$(top_ompi_builddir)/include 
 AM_OBJCFLAGS = $(pls_xgrid_OBJCFLAGS)
 
+# Automake and Libtool don't completely speak Objective C.  Since the
+# only Objective C we'll be using is GCC on Mac OS X, we can pretend
+# to be C instead of ObjC for libtool and it works well enough.  If CC
+# and OBJC aren't the same, Libtool doesn't automatically infer that
+# we're using C and Automake doesn't add the --tag, so we need to
+# explicitly list these two rules so that the --tag=CC line is passed
+# to libtool.
+LTOBJCCOMPILE = $(LIBTOOL) --mode=compile  --tag=CC $(OBJC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_OBJCFLAGS) $(OBJCFLAGS)
+OBJCLINK = $(LIBTOOL) --mode=link --tag=CC $(OBJCLD) $(AM_OBJCFLAGS) \
+	$(OBJCFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
+
 xgrid_sources = \
     src/pls_xgrid.h \
     src/pls_xgrid_component.m \

orte/mca/ras/xgrid/Makefile.am

@@ -18,9 +18,21 @@
 
 # Use the top-level Makefile.options
 
-
-
 AM_CPPFLAGS = -I$(top_ompi_builddir)/include
+AM_OBJCFLAGS = $(ras_xgrid_OBJCFLAGS)
+
+# Automake and Libtool don't completely speak Objective C.  Since the
+# only Objective C we'll be using is GCC on Mac OS X, we can pretend
+# to be C instead of ObjC for libtool and it works well enough.  If CC
+# and OBJC aren't the same, Libtool doesn't automatically infer that
+# we're using C and Automake doesn't add the --tag, so we need to
+# explicitly list these two rules so that the --tag=CC line is passed
+# to libtool.
+LTOBJCCOMPILE = $(LIBTOOL) --mode=compile  --tag=CC $(OBJC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_OBJCFLAGS) $(OBJCFLAGS)
+OBJCLINK = $(LIBTOOL) --mode=link --tag=CC $(OBJCLD) $(AM_OBJCFLAGS) \
+	$(OBJCFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
 
 xgrid_sources = \
 	src/ras_xgrid.h \