Tell nvcc to use the correct MPICXX binary

There was a bug related to

  https://gcc.gnu.org/pipermail/gcc-help/2021-June/140490.html

where nvcc was getting other versions of the gcc compiler
and the libstd++ version were mismatched, resulting in linking errors.

include/atrip/Utils.hpp

@@ -52,11 +52,13 @@ namespace atrip {
 #pragma GCC diagnostic ignored "-Wunused-parameter"
   template <typename T>
   std::string pretty_print(T&& value) {
-    std::stringstream stream;
 #if ATRIP_DEBUG > 2
+    std::stringstream stream;
     dbg::pretty_print(stream, std::forward<T>(value));
-#endif
     return stream.str();
+#else
+    return "";
+#endif
   }
 #pragma GCC diagnostic pop
 // Pretty printing:1 ends here

src/Makefile.am

@@ -16,7 +16,7 @@ libatrip_a_CPPFLAGS += $(CUDA_CXXFLAGS)
 libatrip_a_DEPENDENCIES = $(NVCC_OBJS)
 libatrip_a_LIBADD = $(NVCC_OBJS)
 %.nvcc.o: %.cxx
-	$(NVCC) -c -x cu -I../ $(CPPFLAGS) $(CTF_CPPFLAGS) $(DEFS) $(libatrip_a_CPPFLAGS) $< -o $@
+	$(NVCC) -c -x cu -ccbin="${MPICXX}" -I../ $(CPPFLAGS) $(CTF_CPPFLAGS) $(DEFS) $(libatrip_a_CPPFLAGS) $< -o $@
 
 #./atrip/Equations.o: ./atrip/Equations.cxx
 #	$(NVCC) -c -I../ $(CPPFLAGS) $(libatrip_a_CPPFLAGS) $< -o $@