Makefile to compile .so in src (was: Re: automated libR location)

Prof Brian Ripley wrote:
'library' in R has a different meaning: I've altered the subject to be
more accurate 'libR'.

This is what R CMD SHLIB is for: it does all this for you in a portable way.

But if you want to DIY, you can use R CMD config to find out the
appropriate linker incantation.
Thank you for the clarification.  I do not insist on doing it myself
and would welcome
R doing it automatically.  I guess I did not fully understand the
instructions in the
document "R Extensions".  (English is my second language.)

A small example compiling a single .so would help greatly I think.  My
current Makefile
that I put in src of  a package skeleton looks like this to create the
.so on Linux:

all :  QUIC.so

OBJECTS = QUIC.o QUIC.so

PKG_LIBS = @LAPACK_LIBS@ @BLAS_LIBS@

QUIC.o : QUIC.cpp
        g++ -O3 -DNDEBUG -Wall -fpic -pthread -shared
-fno-omit-frame-pointer -ansi -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -c
QUIC.cpp -o QUIC.o

QUIC.so : QUIC.o
	g++ -std=gnu99  -shared -lm -llapack -lblas -L/usr/lib/R/lib -lR -O3
QUIC.o -o QUIC.so
1. I don't believe you really need all the flags from above. If so, 
within a package, use a Makevars file.

2. R CMD SHLIB QUIC.cpp shoudl do the trick already, perhaps some linker 
flags are required for blas that can be specified in the same line, see 
R CMD SHLIB --help

Uwe Ligges
This actually built and created a loadable package but I would want to
do it more the R-way.

Thanks in advance!
-Matyas

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Hi Uwe,
1. I don't believe you really need all the flags from above. If so, within a
package, use a Makevars file.

2. R CMD SHLIB QUIC.cpp shoudl do the trick already, perhaps some linker
flags are required for blas that can be specified in the same line, see R
CMD SHLIB --help
Thanks, I think I understand now better.  I was not familiar with
Makevars files (I only dealt with Makefiles before).

I ended up simply using in the Makevars file:

PKG_LIBS = $(LAPACK_LIBS) $(FLIBS) $(BLAS_LIBS)
PKG_CXXFLAGS = -D_LANG_R

which seems to do the job.  I am just slightly uncertain about the $()
notation; in some docs I saw @BLAS_LIBS@ to appear.  So is
$() ok? Is it the right syntax?

Thanks again!
-Matyas
Hi Uwe,

1. I don't believe you really need all the flags from above. If so, within a
package, use a Makevars file.

2. R CMD SHLIB QUIC.cpp shoudl do the trick already, perhaps some linker
flags are required for blas that can be specified in the same line, see R
CMD SHLIB --help
Thanks, I think I understand now better.  I was not familiar with
Makevars files (I only dealt with Makefiles before).

I ended up simply using in the Makevars file:

PKG_LIBS = $(LAPACK_LIBS) $(FLIBS) $(BLAS_LIBS)
PKG_CXXFLAGS = -D_LANG_R

which seems to do the job.  I am just slightly uncertain about the $()
notation; in some docs I saw @BLAS_LIBS@ to appear.  So is
$() ok? Is it the right syntax?
The @BLAS_LIBS@ should typically appear in an .in file only rather than 
the Makevars file itself.

Uwe Ligges
Thanks again!
-Matyas