SHLIB steps on a Makefile

On Thu, 20 Dec 2007, Iago Mosqueira wrote:

Hi,

I need to create a Makefile.win for a given package so as to fiddle
slightly with the compilation process. My Makefile works fine in Linux

That's rather dangerous: we have had lots of trouble with packages for
which the Makefile works on the maintainer's Linux, but not on other
people's systems (even Linux ones).

Do you really, really need a Makefile.win?: I would be surprised if you
did.  Only 9 CRAN packages have a Makefile.win, and two of those are
dummies and one other we have asked the maintainers to replace by
Makevars.win as it is not portable.

but I am having trouble creating Makefile.win for MinGW. I first
looked at the commands that Rcmd SHLIB appeared to be running and
copied those onto the Makefile. But one step seems to be missing, the
creation of the _res.rc file needed by windres

      g++-sjlj -I$(RHOME)/include -I../inst/include/ -O2 -Wall -c pkg.cpp -o pkg.o
      windres --preprocessor="gcc-sjlj -E -xc -DRC_INVOKED"
-I$(RHOME)/include -I../inst/include -i pkg_res.rc -o pkg_res.o
      g++-sjlj -shared -s -o pkg.dll pkg.def pkg.o FL pkg_res.o -L$(RHOME)/bin -lR

This might be fairly obvious, but it is my first attempt at compiling
with MinGW and my search has been fruitless.

What is it that I need to add to replicate what Rcmd SHLIB does?

Adding the resources is not essential: they add identification to the
DLL which can be very useful but are icing on the cake.  So I would not
try to emulate that step.

But the Makefile in use is src/gnuwin32/MakeDll and that contains

$(DLLNAME)_res.rc:
         @PERL5LIB=$(RHOME)/share/perl $(PERL) $(RHOME)/src/gnuwin32/makeDllRes.pl $(DLLNAME) > $@

$(DLLNAME)_res.o: $(DLLNAME)_res.rc $(RHOME)/include/Rversion.h