require 8-byte memory address for large mem tests

Configures testsuite to only run certain large type/count tests on
platforms that can supported larger memory allocations.
Fixes #1975
Signed-off-by: Rob Latham <robl@mcs.anl.gov>

test/mpi/configure.ac

@@ -356,6 +356,14 @@ if test "$enable_checkpointing" = "yes" ; then
 fi
 AC_SUBST(ckpointdir)
 
+AC_CHECK_SIZEOF(void *)
+# for tests that require large mem
+largetest="#"
+if test $ac_cv_sizeof_void_p -ge 8; then
+    largetest=""
+fi
+AC_SUBST(largetest)
+
 #
 # Only run xfail tests if enabled
 RUN_XFAIL=false
@@ -1447,6 +1455,7 @@ AC_OUTPUT(maint/testmerge \
           coll/Makefile \
           comm/Makefile \
           datatype/Makefile \
+          datatype/testlist \
           errhan/Makefile \
           group/Makefile \
           info/Makefile \

test/mpi/datatype/testlist → test/mpi/datatype/testlist.in

@@ -48,8 +48,8 @@ get-elements 1
 hindexed_block 1 mpiversion=3.0
 hindexed_block_contents 1 mpiversion=3.0
 longdouble 1
-large-count 1 mpiversion=3.0 xfail=ticket1767
+@largetest@large-count 1 mpiversion=3.0 xfail=ticket1767
 cxx-types 1 mpiversion=3.0
-large_type 1 mpiversion=3.0
-large_type_sendrec 2 arg=31 mpiversion=3.0
-large_type_sendrec 2 arg=32 mpiversion=3.0 timeLimit=300
+@largetest@large_type 1 mpiversion=3.0
+@largetest@large_type_sendrec 2 arg=31 mpiversion=3.0
+@largetest@large_type_sendrec 2 arg=32 mpiversion=3.0 timeLimit=300