CODEWITHSUNDEEP
rrcpprcpparmadillo
Olivia
Olivia

Reputation: 43

How to remove the warning: Rcpp/DataFrame.h:136:18: warning unused variable 'data'?

I created an R package using RcppArmadillo from my Mac, and then built and installed it by doing the following:

Rcpp::compileAttributes()
devtools::build()
devtools::install()

However, I received several same warnings as below:

clang++ -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/include" -I"/Library/Frameworks/R.framework/Versions/3.6/Resources/library/RcppArmadillo/include" -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include  -fopenmp  -fPIC  -Wall -g -O2  -c RcppExports.cpp -o RcppExports.o
In file included from RcppExports.cpp:4:
In file included from /Library/Frameworks/R.framework/Versions/3.6/Resources/library/RcppArmadillo/include/RcppArmadillo.h:34:
In file included from /Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/include/Rcpp.h:57:
/Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/include/Rcpp/DataFrame.h:136:18: warning: unused variable 'data' [-Wunused-variable]
            SEXP data = Parent::get__();
                 ^
1 warning generated.

The package works fine although there are warnings during installation. Does anyone know how I can get rid of these warnings?

(I tried the answer here: Wunused-variable errors in Rcpp, but I still got the warnings.)

Upvotes: 4

Views: 1052

Answers (1)

Dirk is no longer here
Dirk is no longer here

Reputation: 368181

My previous (generic) StackOverflow answer (which you already referenced in your question) is still valid: Add the flag to CXXFLAGS (and maybe also CXX11FLAGS).

Alternatively, you can install an updated Rcpp version from the Rcpp Drat repo via

install.packages("Rcpp", repos="https://rcppcore.github.io/drat")

to get an Rcpp version with this fixes, and some other new versions. These fix will eventually make it into the CRAN version.

Edit: Here is a link to relevant announcement to the Rcpp mailing list.

Upvotes: 3

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