created default rule to build evertying but fortran, kept all rule to build...

created default rule to build evertying but fortran, kept all rule to build everything, modified README accordingly

GNUmakefile

@@ -80,7 +80,7 @@ DFFT_MPI_FFLAGS ?= -g -O3 -cpp
 DFFT_MPI_LDFLAGS ?= 
 
 # additional Fortran linker flags
-# sometimes this also needs -lmpi++
+# sometimes this also needs -lmpi++, -lmpicxx, -lmpi_cxx, etc
 DFFT_MPI_FLDFLAGS ?= -lstdc++
 
 # FFTW3
@@ -96,6 +96,8 @@ DFFT_MPI_LDFLAGS += $(DFFT_FFTW_LDFLAGS)
 
 
 
+default: nativec utilities
+
 all: nativec utilities fortran
 
 nativec: $(DFFT_MPI_DIR)/TestDfft
@@ -104,6 +106,7 @@ fortran: $(DFFT_MPI_DIR)/TestFDfft
 
 utilities: $(DFFT_MPI_DIR)/CheckDecomposition
 
+.PHONY: clean
 clean: 
 	rm -rf $(DFFT_MPI_DIR) *.mod
 

README

 SWFFT (HACC)
 Adrian Pope (et al)
 apope@anl.gov
-2017-10-02
+2017-10-25
 
 ========
 Overview
@@ -59,9 +59,14 @@ MPI-only version of the code:
 
 $ make
 
-By default the GNUmakefile will make the C/C++ interface and driver, the
-Fortran interface and driver, and the CheckDecomposition utility. There are
-also rules to make subsets of these:
+By default the GNUmakefile will make the C/C++ interface and test driver 
+and the CheckDecomposition utility. The Fortran interface and test driver
+are not built by default as the GNUmakefile will often require modification
+to properly build and link the application. To make everything:
+
+$ make all
+
+There are also rules to make subsets of these:
 
 $ make nativec
 $ make utilities