[Rd] How to change name of .so/.dll

Simon Urbanek simon.urbanek at r-project.org
Wed Jun 13 02:38:16 CEST 2012

On Jun 12, 2012, at 6:39 PM, Matthew Dowle wrote:

> Matthew Dowle wrote :
>> Hi,
>> I've added R_init_data_table to the "data.table" package (which has a dot
>> in its name). This works well in R 2.15.0, because of this from the
>> Writing R Extensions manual :
>> " Note that there are some implicit restrictions on this mechanism as the
>> basename of the DLL needs to be both a valid file name and valid as part
>> of a C entry point (e.g. it cannot contain ‘.’): for portable code it is
>> best to confine DLL names to be ASCII alphanumeric plus underscore. As
>> from R 2.15.0, if entry point R_init_lib is not found it is also looked
>> for with ‘.’ replaced by ‘_’. "
>> But how do I confine the DLL name, is it an option in Makevars?
>> The name of the shared object is currently "data.table.so" (data.table.dll
>> on Windows).  Is it possible to change the file name to "datatable.so"
>> (and datatable.dll) in a portable way so that R_init_datatable works
>> (without a dot), and, without Depend-ing on R>=2.15.0 and without changing
>> the name of the package?
> Just to clarify, I'm aware R CMD SHLIB has the -o argument which can be
> used create datatable.so instead of data.table.so. It's R CMD INSTALL
> that's the problem as that seems to pass -o <pkg_name> to R CMD SHLIB.  I
> found install.libs.R (added to R in 2.13.1), could that be used to create
> datatable.so instead of data.table.so? Or a line I could add to
> pkg/src/Makevars?

Something like

all: $(SHLIB)
        mv $(SHLIB) datatable$(SHLIB_EXT)

should do the trick (resist the temptation to create a datatable$(SHLIB_EXT) target - it doesn't work due to the makefile loading sequence, unfortunately). AFAIR you don't need to mess with install.libs because the default is to install all shlibs in the directory.


> Thanks!
> Matthew
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