Problem with R package while building KDEStateMachineEditor

Hi Sylvain,

Thanks for posting here (even if this is more of a CMake than a Debian
question ...).

| Hello everyone!
| 
| I have a big problem that takes me mad since 3 days...
| 
| I try to build KDEStateMachineEditor with cmake. This soft includes 
| GraphViz, which includes himself SWIG which needs R.
| 
| With cmake, when I configure KDEStateMachineEditor before a generation, 
| I am told that the R package is missing:
| 
| "---------------------------------------------------------------------------------"
| /Checking for module 'R'
|  ??? Package 'R', required by 'virtual:world', not found
| setting -DENABLE_R=OFF/
| 
| "---------------------------------------------------------------------------------"
| 
| ... but every necessary R packages seem to be installed on my computer.
| 
| I have found the line of the GraphViz's *CMakeList.txt* involved:
| 
| "---------------------------------------------------------------------------------"
| 
| /find_package(SWIG COMPONENTS csharp d go guile java javascript lua 
| perl5 php7 python *r* )/
| 
| "---------------------------------------------------------------------------------"
| 
| After a look at the cmake doc, it seems that I should have a file like 
| FindR.cmake, but there not such a file on my disk. Instead I do have 
| this file : */usr/lib/R/site-library/qtl/contrib/bin/FindRLibs.cmake*
| 
| So, what must I do to solve this problem?

Ask CMake experts?  R itself uses GNU autoconf extensively (and fixed scripts
on Windows).  For the same reason, CMake is not that widely used for R
package builds.  However, given that more and more _external_ libraries use
CMake, you see it used in R packages to provide these external libraries.

Now, R is also not that often embedded [1] which may explain why you don't
find many FindR.cmake or FindRLibs.cmake.

That said, searching at GitHub (a good resource for this!!) find

 285 hits for FindR.cmake:  https://github.com/search?q=FindR.cmake&type=repositories
  57 hist for FindRLibs.cmake:  https://github.com/search?q=FindRLibs.cmake&type=code

Maybe those can help you?

Cheers,  Dirk


[1] I wrote a package for that: RInside. It's on CRAN and at my GitHub, but
again no CMake apart for an older contributed examples configuration.

| 
| Thanks!
| 
| Sylvain
| 
| (France)
| 
| 	[[alternative HTML version deleted]]
| 
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dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org

? Mon, 13 Jan 2025 19:27:53 +0100
Sylvain S?cherre via R-SIG-Debian <r-sig-debian at r-project.org> ?????:

I try to build KDEStateMachineEditor with cmake. This soft includes 
GraphViz, which includes himself SWIG which needs R.

Judging by the CMakeLists.txt belonging to GraphViz [*], it should be
possible to disable its SWIG support by setting -DENABLE_SWIG=OFF.

The exact check for R is done using pkg-config:

if(NOT ENABLE_R STREQUAL "OFF")
  if(PkgConfig_FOUND)
    pkg_check_modules(R R)

The check might be not exactly correct - on my Debian Bookworm
installation, pkg-config libR succeeds, but pkg-config R doesn't - but
neither of that should be required to compile GraphViz for the purpose
of rendering state machine graphs for KDStateMachineEditor. And it
isn't, CMakeLists.txt just shrugs and moves on:

  else()
    message(STATUS "setting -DENABLE_R=OFF")
    set(ENABLE_R OFF)
  endif()

We can see this code working in your CMake log:

 ??? Package 'R', required by 'virtual:world', not found
setting -DENABLE_R=OFF

Does it really fail after that? If not, feel free to ignore this
message. If yes, the problem must be somewhere below.

I've installed libgraphviz-dev and configured the project with

cmake -S . -DKDSME_INTERNAL_GRAPHVIZ=false -B build

...and it seems to have successfully compiled. 'make test' succeeds
too, and I can launch build/bin/kdstatemachineeditor and try things in
the user interface.

Best regards,
Ivan

[*]
https://gitlab.com/graphviz/graphviz/-/blob/main/CMakeLists.txt?ref_type=heads