[R] Question about building library and BLAS

[Zhu Wang]

Dear helpers,

I am trying to create a library which uses some Fortran source files and Lapack and Blas
subroutines. The Fortran source files from the original author contain subroutines 
isamax.f, sgefa.f and sgesl.f, which are part of BLAS subroutines on my Linux computer,
but maybe different (old) versions. So in addition to these subroutines, there are other
Lapack and Blas subroutines involved. There is no problem to compile and run these files
using g77, such as the following to create car:

g77 -mieee-fp  -fPIC  -O2 -g -pipe -march=i386 -mcpu=i686 car
isamax.f, sgefa.f sgesl.f foo1.f ... foo20.f -llapack -lblas

By doing this, the procedure does not use subroutines isamax.f, sgefa.f sgesl.f in BLAS,
as expected. In fact, there are problems to use these subroutines in BLAS, for some reason.

Now what I want is to build an R library. The Makefile is the following:

LIBNAME=car
 
PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
 
OBJS=isamax.o saxpy.o sscal.o foo1.o ... foo20.o -llapack -lblas

$(LIBNAME)$(SHLIB_EXT): $(OBJS)
        $(SHLIB_LD) $(SHLIB_LDFLAGS) -o $@ $(OBJS) $(FLIBS)
 
clean:
        @rm -f *.o *.$(SHLIB_EXT)
 
realclean: clean

Some compiling outputs are the following:

g77 -mieee-fp  -fPIC  -O2 -g -pipe -march=i386 -mcpu=i686 -c isamax.f
-o isamax.o
...
g77 -mieee-fp  -fPIC  -O2 -g -pipe -march=i386 -mcpu=i686 -c foo1.f -o
foo1.o
......
gcc -shared -o car.so isamax.o ...... foo20.o -llapack -lblas
-L/usr/local/lib -L/usr/lib/gcc-lib/i386-redhat-linux/3.3.2
-L/usr/lib/gcc-lib/i386-redhat-linux/3.3.2/../../.. -lfrtbegin -lg2c
-lm -lgcc_s

However, it turns out that this process did not take into account these 
three files isamax, sgefa.f and sgesl.f. 
Instead, it used subroutines in Blas, but again for some reason, it provided
error. 

My question is how do I set up my Makefile, or maybe other files, such that I have
the same result as I did to compile and run these Fortran files directly.

Thanks in advance.

-- 
Zhu Wang

Statistical Science Department
Southern Methodist University
Dallas, TX 75275-0332
Phone:(214)768-2453  Fax:(214)768-4035
zhuw at mail.smu.edu