[R-pkg-devel] Package Load fails to find 3rd Party DLL

Fri, Jul 14, 2023 10:29 AM

Thanks.? I know know the problem is in the Makevars.win; however, I'm 
still confused.

My `Makevars.win` had

| .PHONY:?? all NeticaDLL clean

| all: $(SHLIB)
| $(SHLIB): NeticaDLL
|
| NeticaDLL:
|? ? mkdir -p "$(INSTALL_LIB)"
|? ? cp "${NETICA_LIB}/Netica.dll" "${INSTALL_LIB}"
|??? cp "${NETICA_LIB}/Netica.lib" "${INSTALL_LIB}"

[BTW, I tried change this to

| all: NeticaDLL $(SHLIB)

and got the same problem.]

This looks very much like the `mylibs` example in 
https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Using-Makevars

So I'm confused.? Why is the Makevars -> Makefile conversion assuming 
that all targets of $(SHLIB) (or all) are executable files, ignoring the 
PHONY declaration?

Also, does the example in the Writing R Extensions manual still work?

 ??? --Russell

On 7/14/23 11:14 AM, Ivan Krylov wrote:

? Wed, 12 Jul 2023 09:41:11 -0400
Russell Almond<russell.g.almond at gmail.com>  ?????:

  ? C:\rtools43\x86_64-w64-mingw32.static.posix\bin\nm.exe:
'NeticaDLL': No such file

This is where the problem starts. You can retrace the steps that R
takes when building and installing the package by running sh
configure.win manually and then running something like
R_PACKAGE_DIR="$(pwd)" R CMD SHLIB -n *.c in the src subdirectory of
the package. That will in turn tell you the exact command lines to be
run while building your package, including the following:

  nm Cases.o Continuous.o Edges.o Experience.o Inference.o Networks.o \
   Node.o Random.o Registration.o Session.o NeticaDLL \
  | sed -n 's/^.* [BCDRT] / /p' \
  | sed -e '/[.]refptr[.]/d' -e '/[.]weak[.]/d' \
  | sed 's/[^ ][^ ]*/"&"/g' \

  >> tmp.def;

That "NeticaDLL" at the end of the list of object files doesn't belong
there. I think it gets added because it's among the dependencies of the
$(SHLIB) Make target. It would be best to make that target a real
object file that nm.exe can process. Otherwise, you could also write
your own .def file and skip its automatic generation.

After nm fails, you get a crash in the linker (while parsing the
resulting incomplete .def file?), which leaves your package without a
shared library to use:

C:\rtools43\x86_64-w64-mingw32.static.posix\bin/ld.exe: internal
error: aborting at ../../binutils-2.40/ld/ldlang.c:527 in
compare_section
C:\rtools43\x86_64-w64-mingw32.static.posix\bin/ld.exe: please report
this bug

There must be a way to streamline this process. Maybe put all the
library-downloading and extraction code into a portable
tools/configure.R (to be launched manually from the configure shell
script), leaving src/Makevars only to compile your own code, link with
Netica using PKG_LIBS, then copy the additional Netica DLL from a
custom install.libs.R file?

Russell Almond
https://ralmond.net/

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[R-pkg-devel] Package Load fails to find 3rd Party DLL

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