[R-package] MSVC compile failure (R, Windows)

[GabeAl]

Description

Followed the guide here: https://github.com/microsoft/LightGBM/tree/master/R-package

Reproducible example

LightGBM>Rscript build_r.R

Environment info

Windows 11. MSVC v145 libraries. MS VS 2022 and build tools. Git for Windows installed and in path. CMake for windows installed and in path. devools and Rcpp installed. R 4.5.0. RTools 4.5.

LightGBM version or commit hash: 20a1542

Command(s) you used to install LightGBM

git clone --recursive https://github.com/microsoft/LightGBM.git
Rscript build_r.R

PATH contains:

Additional Comments

  lightgbm_objs.vcxproj -> C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\lightgbm_objs.dir\Release\lightgbm_objs.lib
C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppBuild.targets(548,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporary directory as it could lead to issues with incremental build. [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
  Building Custom Rule C:/Users/gabex/AppData/Local/Temp/RtmpimXu3P/Rbuild8c246f963971/lightgbm/src/CMakeLists.txt
     Creating library C:/Users/gabex/AppData/Local/Temp/RtmpimXu3P/Rbuild8c246f963971/lightgbm/src/Release/lightgbm.lib and object C:/Users/gabex/AppData/Local/Temp/RtmpimXu3P/Rbuild8c246f963971/lightgbm/src/Release/lightgbm.exp
tree_learner.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
voting_parallel_tree_learner.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
data_parallel_tree_learner.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gradient_discretizer.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linear_tree_learner.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
serial_tree_learner.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metric.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linkers_socket.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
network.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
objective_function.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metadata.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
parser.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
sample_strategy.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
bin.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset_loader.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
c_api.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
boosting.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt_model_text.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt.obj : error LNK2001: unresolved external symbol Rprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
feature_parallel_tree_learner.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
serial_tree_learner.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree_learner.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
voting_parallel_tree_learner.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
network.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
objective_function.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
data_parallel_tree_learner.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
feature_histogram.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dcg_calculator.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metric.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linkers_socket.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
json11.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metadata.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
parser.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
train_share_states.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config_auto.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset_loader.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
prediction_early_stop.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
sample_strategy.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
bin.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
c_api.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
boosting.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt_model_text.obj : error LNK2001: unresolved external symbol REprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree_learner.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
voting_parallel_tree_learner.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
data_parallel_tree_learner.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gradient_discretizer.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linear_tree_learner.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
serial_tree_learner.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metric.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linkers_socket.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
network.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
objective_function.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metadata.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
parser.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
sample_strategy.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
bin.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset_loader.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
c_api.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
boosting.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt_model_text.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt.obj : error LNK2001: unresolved external symbol Rvprintf [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
voting_parallel_tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
feature_parallel_tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gradient_discretizer.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linear_tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
serial_tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
network.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
objective_function.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
data_parallel_tree_learner.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
feature_histogram.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
tree.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dcg_calculator.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metric.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
linkers_socket.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
json11.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
metadata.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
parser.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
train_share_states.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config_auto.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
config.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset_loader.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
dataset.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
prediction_early_stop.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
sample_strategy.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
bin.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
c_api.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
boosting.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
gbdt_model_text.obj : error LNK2001: unresolved external symbol R_FlushConsole [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_error referenced in function LGBM_NullBoosterHandleError_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_registerRoutines referenced in function R_init_lightgbm [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_useDynamicSymbols referenced in function R_init_lightgbm [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_CHAR referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_isNull referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol TYPEOF referenced in function LGBM_BoosterLoadModelFromString_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol INTEGER referenced in function LGBM_DatasetCreateFromCSC_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol RAW referenced in function LGBM_BoosterLoadModelFromString_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol REAL referenced in function LGBM_DatasetCreateFromCSC_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol SET_STRING_ELT referenced in function LGBM_DatasetGetFeatureNames_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol SET_VECTOR_ELT referenced in function LGBM_BoosterPredictSparseOutput_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_asChar referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_asLogical referenced in function LGBM_BoosterPredictSparseOutput_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_asInteger referenced in function LGBM_DatasetCreateFromCSC_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_asReal referenced in function "__int64 __cdecl get_altrepped_vec_len(struct SEXPREC *)" (?get_altrepped_vec_len@@YA_JPEAUSEXPREC@@@Z) [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_mkChar referenced in function "struct SEXPREC * __cdecl wrapped_Rf_mkChar(void *)" (?wrapped_Rf_mkChar@@YAPEAUSEXPREC@@PEAX@Z) [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_MakeExternalPtr referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_ExternalPtrAddr referenced in function LGBM_HandleIsNull_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_ClearExternalPtr referenced in function LGBM_DatasetFree_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_SetExternalPtrAddr referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_RegisterCFinalizerEx referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_MakeUnwindCont referenced in function LGBM_DatasetGetFeatureNames_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_ContinueUnwind referenced in function __catch$LGBM_BoosterAddValidData_R$0 [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_UnwindProtect referenced in function LGBM_DatasetGetFeatureNames_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_allocVector referenced in function "struct SEXPREC * __cdecl make_R_vec_from_arr<int>(void *)" (??$make_R_vec_from_arr@H@@YAPEAUSEXPREC@@PEAX@Z) [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_mkNamed referenced in function LGBM_BoosterPredictSparseOutput_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_ScalarInteger referenced in function LGBM_BoosterGetNumFeature_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_ScalarLogical referenced in function LGBM_HandleIsNull_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_xlength referenced in function LGBM_BoosterPredictForCSR_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_protect referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_unprotect referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol STRING_ELT referenced in function LGBM_BoosterLoadModelFromString_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_altrep_data1 referenced in function "void * __cdecl get_altrepped_raw_dataptr(struct SEXPREC *,enum Rboolean)" (?get_altrepped_raw_dataptr@@YAPEAXPEAUSEXPREC@@W4Rboolean@@@Z) [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol R_altrep_data2 referenced in function "__int64 __cdecl get_altrepped_vec_len(struct SEXPREC *)" (?get_altrepped_vec_len@@YA_JPEAUSEXPREC@@@Z) [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
lightgbm_R.obj : error LNK2019: unresolved external symbol __imp_R_NilValue referenced in function LGBM_DatasetCreateFromFile_R [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\Release\lightgbm.dll : fatal error LNK1120: 39 unresolved externals [C:\Users\gabex\AppData\Local\Temp\RtmpimXu3P\Rbuild8c246f963971\lightgbm\src\build\_lightgbm.vcxproj]
Error in .run_shell_command(build_cmd, build_args) :
  Command failed with exit code: 1
* removing 'C:/Users/gabex/AppData/Local/Temp/RtmpimXu3P/Rinst8c246af94fc3/lightgbm'
      -----------------------------------
ERROR: package installation failed
Error in .run_shell_command("R", r_build_args) :
  Command failed with exit code: 1
Execution halted

[GabeAl]

To answer some questions you might have of me:

• I have a many-core machine and CPU usage is low with the default CRAN build. The documentation also advises building with MSVC.
• The nature of the error implies inability to link with or import symbols from the R.dll (despite finding it)
• Here's the build log at the beginning of the build (before the sea of warnings about type casts):

C:\Users\gabex\Downloads\LightGBM-4.6.0\LightGBM-4.6.0\LightGBM>Rscript build_r.R -j32
* checking for file 'C:/Users/gabex/Downloads/LightGBM-4.6.0/LightGBM-4.6.0/LightGBM/lightgbm_r/DESCRIPTION' ... OK
* preparing 'lightgbm':
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
      -----------------------------------
* installing *source* package 'lightgbm' ...
** this is package 'lightgbm' version '4.6.0.99'
** using staged installation
** libs
installing via 'install.libs.R' to C:/Users/gabex/AppData/Local/Temp/RtmpQbLIfx/Rinst2e5c6a73e90/00LOCK-lightgbm/00new/lightgbm
Trying 'Visual Studio 17 2022'
-- Selecting Windows SDK version 10.0.26100.0 to target Windows 10.0.
-- The C compiler identification is MSVC 19.44.35221.0
-- The CXX compiler identification is MSVC 19.44.35221.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2022/BuildTools/VC/Tools/MSVC/14.44.35207/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2022/BuildTools/VC/Tools/MSVC/14.44.35207/bin/Hostx64/x64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- R version passed into FindLibR.cmake: 4.5.0
Warning message:
-- Creating R.lib and R.def
In normalizePath(path.expand(path), winslash, mustWork) :
  path[1]="C:/PROGRA~1/R/R-45~1.0/lib": The system cannot find the file specified
Creating 'C:/Users/gabex/AppData/Local/Temp/RtmpQbLIfx/Rbuild2e5c48646d61/lightgbm/src/build/R.def' from 'C:/Program Files/R/R-4.5.0/bin/x64/R.dll'
Successfully created 'C:/Users/gabex/AppData/Local/Temp/RtmpQbLIfx/Rbuild2e5c48646d61/lightgbm/src/build/R.def'
C:/rtools45/x86_64-w64-mingw32.static.posix/bin/dlltool.exe: Syntax error in def file C:/Users/gabex/AppData/Local/Temp/RtmpQbLIfx/Rbuild2e5c48646d61/lightgbm/src/build/R.def:3
-- Found LibR: C:/Program Files/R/R-4.5.0
-- LIBR_EXECUTABLE: C:/Program Files/R/R-4.5.0/bin/x64/R.exe
-- LIBR_INCLUDE_DIRS: C:/Program Files/R/R-4.5.0/include
-- LIBR_LIBS_DIR: C:/PROGRA~1/R/R-45~1.0/lib
-- LIBR_CORE_LIBRARY: C:/Program Files/R/R-4.5.0/bin/x64/R.dll
-- Found OpenMP_C: -openmp (found version "2.0")
-- Found OpenMP_CXX: -openmp (found version "2.0")
-- Found OpenMP: TRUE (found version "2.0")
-- Performing Test MM_PREFETCH
-- Performing Test MM_PREFETCH - Failed
-- Performing Test MM_MALLOC
-- Performing Test MM_MALLOC - Failed
-- Looking for inet_pton
-- Looking for inet_pton - found
-- Configuring done (31.3s)
-- Generating done (0.0s)
-- Build files have been written to: C:/Users/gabex/AppData/Local/Temp/RtmpQbLIfx/Rbuild2e5c48646d61/lightgbm/src/build
Successfully created build files for 'Visual Studio 17 2022'
Building lightgbm.dll
MSBuild version 17.14.23+b0019275e for .NET Framework

[GabeAl]

Maybe a hint?

path[1]="C:/PROGRA1/R/R-451.0/lib": The system cannot find the file specified

There is no "lib" folder in there.

Here's what's really there:

C:\PROGRA~1\R\R-45~1.0>ls
CHANGES  MD5     README.R-4.5.0  bin  etc      library  share  tests         unins000.exe
COPYING  README  Tcl             doc  include  modules  src    unins000.dat

C:\PROGRA~1\R\R-45~1.0>ls bin
R.exe  Rscript.exe  config.sh  x64

C:\PROGRA~1\R\R-45~1.0>ls bin/x64
R.dll  RSetReg.exe  Rcmd.exe  Rgraphapp.dll  Riconv.dll   Rscript.exe  open.exe
R.exe  Rblas.dll    Rfe.exe   Rgui.exe       Rlapack.dll  Rterm.exe

Seems you should be looking in bin/x64 if you want the R.dll? Or am I misunderstanding what it wants with "lib"? There are many potential "lib" interpretations and it's not clearly documented.

[GabeAl]

Yup, I tested by stuffing the R.dll now in bin/x64 into a new folder called /lib. Now a new set of errors:

Creating 'C:/Users/gabex/AppData/Local/Temp/Rtmp2j0fac/Rbuild330c63914ea3/lightgbm/src/build/R.def' from 'C:/Program Files/R/R-4.5.0/lib/R.dll'
Successfully created 'C:/Users/gabex/AppData/Local/Temp/Rtmp2j0fac/Rbuild330c63914ea3/lightgbm/src/build/R.def'
C:/rtools45/x86_64-w64-mingw32.static.posix/bin/dlltool.exe: Syntax error in def file C:/Users/gabex/AppData/Local/Temp/Rtmp2j0fac/Rbuild330c63914ea3/lightgbm/src/build/R.def:3
-- Found LibR: C:/Program Files/R/R-4.5.0
-- LIBR_EXECUTABLE: C:/Program Files/R/R-4.5.0/bin/x64/R.exe
-- LIBR_INCLUDE_DIRS: C:/Program Files/R/R-4.5.0/include
-- LIBR_LIBS_DIR: C:/Program Files/R/R-4.5.0/lib
-- LIBR_CORE_LIBRARY: C:/Program Files/R/R-4.5.0/lib/R.dll
-- Found OpenMP_C: -openmp (found version "2.0")
-- Found OpenMP_CXX: -openmp (found version "2.0")
-- Found OpenMP: TRUE (found version "2.0")
-- Performing Test MM_PREFETCH
-- Performing Test MM_PREFETCH - Failed
-- Performing Test MM_MALLOC
-- Performing Test MM_MALLOC - Failed
-- Looking for inet_pton
-- Looking for inet_pton - found
-- Configuring done (31.1s)
-- Generating done (0.0s)
-- Build files have been written to: C:/Users/gabex/AppData/Local/Temp/Rtmp2j0fac/Rbuild330c63914ea3/lightgbm/src/build
Successfully created build files for 'Visual Studio 17 2022'
Building lightgbm.dll

C:/rtools45/x86_64-w64-mingw32.static.posix/bin/dlltool.exe: Syntax error in def file

Clearly something silly.

So I just did it myself:

dumpbin /exports "C:\Program Files\R\R-4.5.0\bin\x64\R.dll" > R.exports.txt

$lines = Get-Content R.exports.txt
$exportLines = $lines |
  Where-Object { $_ -match '^\s+\d+\s+[0-9A-F]+\s+[0-9A-F]+\s+(\S+)$' } |
  ForEach-Object { ($_ -split '\s+')[-1] }

'LIBRARY R'   | Set-Content  R.def
'EXPORTS'     | Add-Content R.def
$exportLines  | Sort-Object -Unique | Add-Content R.def

Then I stick the thing in my rtools dir and short-circuit the cmake function:

function(create_rlib_for_msvc)

  # message(STATUS "Creating R.lib and R.def")

  # # various checks and warnings
  # if(NOT WIN32 OR NOT MSVC)
  #   message(FATAL_ERROR "create_rlib_for_msvc() can only be used with MSVC")
  # endif()

  # if(NOT EXISTS "${LIBR_CORE_LIBRARY}")
  #   message(FATAL_ERROR "LIBR_CORE_LIBRARY, '${LIBR_CORE_LIBRARY}', not found")
  # endif()

  # find_program(DLLTOOL_EXE dlltool)

  # if(NOT DLLTOOL_EXE)
  #   message(FATAL_ERROR "dlltool.exe not found!\nDo you have Rtools installed with its MinGW's bin/ in PATH?")
  # endif()

  # set(LIBR_MSVC_CORE_LIBRARY "${CMAKE_CURRENT_BINARY_DIR}/R.lib" CACHE PATH "R.lib filepath")

  set(LIBR_MSVC_CORE_LIBRARY "C:/rtools45/R.lib" CACHE PATH "R.lib filepath")

I try again and .... close!

I get only one last error:

  Building Custom Rule C:/Users/gabex/AppData/Local/Temp/RtmpIlqRqG/Rbuild68b47b62573e/lightgbm/src/CMakeLists.txt
     Creating library C:/Users/gabex/AppData/Local/Temp/RtmpIlqRqG/Rbuild68b47b62573e/lightgbm/src/Release/lightgbm.lib and object C:/Users/gabex/AppData/Local/Temp/RtmpIlqRqG/Rbuild68b47b62573e/lightgbm/src/Release/lightgbm.exp
lightgbm_R.obj : error LNK2019: unresolved external symbol Rf_xlength referenced in function LGBM_BoosterPredictForCSR_R [C:\Users\gabex\AppData\Local\Temp\RtmpIlqRqG\Rbuild68b47b62573e\lightgbm\src\build\_lightgbm.vcxproj]
C:\Users\gabex\AppData\Local\Temp\RtmpIlqRqG\Rbuild68b47b62573e\lightgbm\src\Release\lightgbm.dll : fatal error LNK1120: 1 unresolved externals [C:\Users\gabex\AppData\Local\Temp\RtmpIlqRqG\Rbuild68b47b62573e\lightgbm\src\build\_lightgbm.vcxproj]
Error in .run_shell_command(build_cmd, build_args) :
  Command failed with exit code: 1
* removing 'C:/Users/gabex/AppData/Local/Temp/RtmpIlqRqG/Rinst68b451f1ded/lightgbm'
      -----------------------------------
ERROR: package installation failed
Error in .run_shell_command("R", r_build_args) :
  Command failed with exit code: 1
Execution halted

One last symbol to nail.

Rf_xlength

[GabeAl]

Nailed it. Simply replaced Rf_xlength with XLENGTH() as actually exported by the dll.

At least it compiles now, and loads.

So a number of issues for y'all to snuff out:

• The location of dll is wrong in the current stack, should be fixed/added to accommodate recent versions of R. It's in %RPATH%/bin/x64
• The objdump script is doing the wrong thing (or dlltool is failing b/c it can't find a symbol or some other syntax issue). It should be doing this:

dumpbin /exports "C:\Program Files\R\R-4.5.0\bin\x64\R.dll" > R.exports.txt

$lines = Get-Content R.exports.txt
$exportLines = $lines |
  Where-Object { $_ -match '^\s+\d+\s+[0-9A-F]+\s+[0-9A-F]+\s+(\S+)$' } |
  ForEach-Object { ($_ -split '\s+')[-1] }

'LIBRARY R'   | Set-Content  R.def
'EXPORTS'     | Add-Content R.def
$exportLines  | Sort-Object -Unique | Add-Content R.def

• Rf_xlength() -> XLENGTH() or the like. I guess another way to override it is in the header like so:
• extern "C" R_xlen_t Rf_xlength(SEXP x) { return (R_xlen_t)LENGTH(x); } voila presto

Now to actually test performance.

By the way is there an easier way? Can I just link to your provided .dll (release page) instead? (Or even better, any chance you all could release a GPU and VScode-compiled R package instead of the clunky CRAN one?) Nobody's gonna complain if they can just point install.packages to a custom location ;)

[jameslamb]

Thanks so much for the report and investigation so far!!

I saw similar issues when trying to build the R package with MSVC + R 4.5 + rtools45 on #7025 and hadn't gone back to try again.

devools and Rcpp installed

Thanks for all the details about your setup! You'd be surprised how many people don't report any of that 😬

But just so you know, in this project we don't use {devtools} or {Rcpp} for anything. So any issues you encounter shouldn't be related to those projects.

am I misunderstanding what it wants with "lib"?

The "libs" directory there refers to where both R.dll is and third-party libraries shipped with R like OpenBLAS are stored. For example, on macOS and Linux LightGBM looks there for OpenMP:

LightGBM/CMakeLists.txt

Lines 802 to 804 in 20a1542

	if(__BUILD_FOR_R)
	list(PREPEND __omp_install_rpaths "${LIBR_LIBS_DIR}")
	endif()

seems you should be looking in bin/x64 if you want the R.dll?

Great investigation, I think you're right!

We have a hard-coded expectation for how things are laid out, assuming that there's a lib/ top-level directory wherever R is installed:

LightGBM/cmake/modules/FindLibR.cmake

Lines 193 to 196 in 20a1542

	execute_process(
	COMMAND ${LIBR_EXECUTABLE} "--slave" "--vanilla" "-e" "cat(normalizePath(R.home('lib'), winslash='/'))"
	OUTPUT_VARIABLE LIBR_LIBS_DIR
	)

Looks like the newer RTools is violating that, so that code needs to do some searching. I guess we'll need to download rtools45 and look at the directory layout like you have, to come adjust this in a way that works with more versions.

Can I just link to your provided .dll (release page) instead?

You cannot, because the lib_lightgbm.dll published with releases does not have R stuff like this compiled in:

LightGBM/include/LightGBM/utils/log.h

Lines 131 to 137 in 20a1542

	#ifndef LGB_R_BUILD
	fprintf(stderr, "[LightGBM] [Fatal] %s\n", str_buf);
	fflush(stderr);
	#else
	REprintf("[LightGBM] [Fatal] %s\n", str_buf);
	R_FlushConsole();
	#endif

Or any of the bindings in https://github.com/microsoft/LightGBM/blob/master/R-package/src/lightgbm_R.cpp

(Or even better, any chance you all could release a GPU and VScode-compiled R package instead of the clunky CRAN one?) Nobody's gonna complain if they can just point install.packages to a custom location ;)

What exactly is "clunky" about the CRAN release? If your goal with posting here is to improve the project, we'd appreciate specific comments about what you'd want to see changed.

For the topic of hosting other build variants (like GPU-enabled packages) elsewhere... let's not talk about that in this issue. We'd welcome a new feature request issue if you'd like. If you do create one, please do the following:

• link to [R-package] Add an R GPU job in CI #3780 and [R-package] Add GPU support for CRAN package #3206
• include as many specifics as possible... for example, if other projects do this, link to those so we can see implementation details like where they host packages

[GabeAl]

You are very welcome James and I appreciate your thorough response! Sorry for spamming you with my adventures but it did indeed eventually work in the end, and more than doubled speed compared to the CRAN release (7.8 minutes on CRAN vs 3.44 in the new build on my 32-thread Strix Halo laptop). Ah yes pardon my misuse of the word, I didn't really mean clunky, I meant less optimized for many-core systems than the MSVC variant. I'm glad I stuck it through and built it with MSVC as the thread use efficiency is truly night and day. I ran into an issue with running it in quantized mode and thought it was something amiss with my comple, but I verified the same behavior occurs in the CRAN build and was reported in other reports for complex models, and all my results are numerically consistent between the CRAN and MSVC compiled master variant. (Also quantization starts working at bin size 16, so it's probably just the complexity issue again and doesn't need a duplicate ticket opened). Good point about requesting a new feature re: precompiled binary releases for R. I do not know of any other release that does this (there used to be Microsoft R Open with an entire repo of optimized code but that was discontinued). There is also bioc-manager /bioClite for bioinformatics, and devtools for simplifying custom compiled installs directly from github. There's also the option of hosting a tar file just like cran does, but in the release page (where your CRAN version is also mirrored) and pointing install.packages() to the download. But I'm not a reliable source on any of this and am not confident I would be able to meaningfully lead a new feature request to that end. Cheerio, Gabe

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On Sat, Dec 6, 2025, 9:31 PM James Lamb ***@***.***> wrote: *jameslamb* left a comment (microsoft/LightGBM#7098) <#7098 (comment)> Thanks so much for the report and investigation so far!! I saw similar issues when trying to build the R package with MSVC + R 4.5 + rtools45 on #7025 <#7025> and hadn't gone back to try again. *devools and Rcpp installed* Thanks for all the details about your setup! You'd be surprised how many people don't report any of that 😬 But just so you know, in this project we don't use {devtools} or {Rcpp} for anything. So any issues you encounter shouldn't be related to those projects. *am I misunderstanding what it wants with "lib"?* The "libs" directory there refers to where both R.dll is and third-party libraries shipped with R like OpenBLAS are stored. For example, on macOS and Linux LightGBM looks there for OpenMP: https://github.com/microsoft/LightGBM/blob/20a15424f63c8f75cec55aab7ad41ae2f3fe9ad2/CMakeLists.txt#L802-L804 *seems you should be looking in bin/x64 if you want the R.dll?* Great investigation, I think you're right! We have a hard-coded expectation for how things are laid out, assuming that there's a lib/ top-level directory wherever R is installed: https://github.com/microsoft/LightGBM/blob/20a15424f63c8f75cec55aab7ad41ae2f3fe9ad2/cmake/modules/FindLibR.cmake#L193-L196 Looks like the newer RTools is violating that, so that code needs to do some searching. I guess we'll need to download rtools45 and look at the directory layout like you have, to come adjust this in a way that works with more versions. *Can I just link to your provided .dll (release page) instead?* You cannot, because the lib_lightgbm.dll published with releases does not have R stuff like this compiled in: https://github.com/microsoft/LightGBM/blob/20a15424f63c8f75cec55aab7ad41ae2f3fe9ad2/include/LightGBM/utils/log.h#L131-L137 Or any of the bindings in https://github.com/microsoft/LightGBM/blob/master/R-package/src/lightgbm_R.cpp *(Or even better, any chance you all could release a GPU and VScode-compiled R package instead of the clunky CRAN one?) Nobody's gonna complain if they can just point install.packages to a custom location ;)* What exactly is "clunky" about the CRAN release? If your goal with posting here is to improve the project, we'd appreciate *specific* comments about what you'd want to see changed. For the topic of hosting other build variants (like GPU-enabled packages) elsewhere... let's not talk about that in this issue. We'd welcome a new feature request issue if you'd like. If you do create one, please do the following: - link to #3780 <#3780> and #3206 <#3206> - include as many specifics as possible... for example, if other projects do this, link to those so we can see implementation details like where they host packages — Reply to this email directly, view it on GitHub <#7098 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB5NOBTBU7FRHFJHXLRE26L4AOGQBAVCNFSM6AAAAACOGFBBAKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTMMRRGUYDONJSGQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>