How do I see and replicate the R default Makevars configuration?

Question

I do not have a ~/.R/Makevars file and

> tools::makevars_user()
character(0)
> tools::makevars_site()
character(0)

Yet, R must be reading the configuration from somewhere as .cpp files containing Rcpp exports in the package src subdirectory compile fine.

I am interested to know how to write a Makefile.win in the src directory so that Rcpp files continue to compile, alongside TMB .cpp files. Currently a makefile like:

all: fn1.dll fn2.dll

fn1.dll: fn1.cpp
    Rscript --vanilla -e "TMB::compile('fn1.cpp')"

fn2.dll: fn2.cpp
    Rscript --vanilla -e "TMB::compile('fn2.cpp')"

clean:
    rm -rf *o

works fine to compile TMB files, and is in fact suggested by: https://github.com/kaskr/adcomp/issues/43

I tried to modify the makefile suggested by Dirk here but had no luck to replicate R's default behaviour even with a fresh new test package.

My session info:

> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Rule Number One: Don't write a Makefile, just write a Makevars snippet. See "Writing R Extensions" for details, and a thousands of CRAN packages as examples. — Dirk Eddelbuettel, Oct 23 '17 at 11:40
As for your question itself: `$(RHOME)/etc/Makeconf` is where it is at. — Dirk Eddelbuettel, Oct 23 '17 at 12:17
Thanks. I hope to transition to a `Makevars` snippet but I just need to know how to integrate the `TMB` bit into this. — Alex, Oct 23 '17 at 22:32
Ah, for my system it is in `$(RHOME)/etc/x64/Makeconf` and `$(RHOME)/etc/i386/Makeconf` — Alex, Oct 23 '17 at 22:34

score 0 · Answer 1 · answered Oct 24 '17 at 21:14

I still have no idea how to use Makevars to do what I want, which is to essentially:

Do a normal default make in Rstudio (Windows 7) via Build and Reload package for all Rcpp export files. Under the hood, this calls Rcpp::compileAttributes() then proceeds to run the other package building commands.
Do another make using Rstudio Build and Reload, except now it reads the Makefile that only compiles the TMB code.

However, I do have a work-around. Essentially, the R extensions manual states that:

Something close to the default behavior could be replicated with the following `src/install.libs.R' file:

...

Since, the code to compile the TMB .cpp files are simply R commands, it is easy enough to integrate them into such a file:

# replicate default R
files <- Sys.glob(paste("*", SHLIB_EXT, sep=''))
libarch <- if (nzchar(R_ARCH)) paste('libs', R_ARCH, sep='') else 'libs'
dest <- file.path(R_PACKAGE_DIR, libarch)
dir.create(dest, recursive = TRUE, showWarnings = FALSE)
file.copy(files, dest, overwrite = TRUE)

# now do TMB files
cpp_files <- list.files('./TMB/', full.names = T, pattern = '*.cpp')

for (f in cpp_files) {
    TMB::compile(f)
}

files <- Sys.glob(paste("./TMB/*", SHLIB_EXT, sep=''))
libarch <- if (nzchar(R_ARCH)) paste('libs', R_ARCH, sep='') else 'libs'
dest <- file.path(R_PACKAGE_DIR, libarch)
dir.create(dest, recursive = TRUE, showWarnings = FALSE)
file.copy(files, dest, overwrite = TRUE)

This file reads and compiles all TMP type .cpp files, stored in the sub-directory <pkgdir>/src/TMB, and then copies all subsequent .dlls in <pkgdir>/src/ and <pkgdir>/src/TMB to the installation directory of the package.

Note, it is possible, but possibly very difficult to use Makevars to get a compilation done when the TMB files are stored in a subdirectory. Dirk recommended the example in the matrix package, but I had no luck modifying the code there to do what I want.

How do I see and replicate the R default Makevars configuration?

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