Hi all,
I tried SO for this, but got no response. Trying here in hope of better luck.
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I am trying to build an R package that uses some C code. I have a C library that
is compiled into an executable, that can be called from the command line. There
is a Makefile associated with it.?
I am trying to grok the information [here][1], where it says
> If you want to create and then link to a library, say using code in a
> subdirectory, use something like
? ? ?.PHONY: all mylibs
? ? ?
? ? ?all: $(SHLIB)
? ? ?$(SHLIB): mylibs
? ? ?
? ? ?mylibs:
? ? ? ? ? ? ?(cd subdir; make)?
> Be careful to create all the necessary dependencies, as there is a no
> guarantee that the dependencies of all
> will be run in a particular order (and some of the CRAN build machines
> use multiple CPUs and parallel makes).
If I create a new subdirectory of the `src` folder in my package, called
`someLibrary`, with the code and Makefile unchanged, and in turn, in the
original `Makevars` file for my package I add the above code unchanged, then I
will be able to build that shared library to be exported using `useDynLib`?
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Edit 1:
----
Following information [here][2], I changed the `Makefile` to create a shared
library by adding?
? ? CFLAG = -fPIC -g -O3?
? ? LDFLAGS= -shared
However, this leads to the problem that the `.so` file is not exported directly
to the `libs` directory of the package. If I hard code the path into the target,
then the file is sent to the `libs` directory of the package (this is all by the
way of calls to `R CMD INSTALL myPackage`).?
----
Edit 2:
----
Lastly, I would like to know how to make calls to the shared library, given that
it has a `main()` method that I could call from the command line executable.
What is the procedure to expose this to the R `NAMESPACE`, so that it can be
called via `.Call`?
PS. ?Please let me know if I should make the last bit a separate question.
? [1]: http://cran.r-project.org/doc/manuals/R-exts.html#Using-Makevars
? [2]:
http://stackoverflow.com/questions/8096015/creating-a-simple-make-file-to-create-a-shared-library-whats-wrong-with-this-m