Could mention stripping

[eddelbuettel]

The added C++ 'glue' certainly adds code, so we cannot expect 92kb == 17kb. But there were some explorations I made into stripping (all on my blog, likely under the r4/ series). In short, CRAN won't let us put (aggressive) stripping in src/Makevars but you can always add it locally. My ~/.R/Makevars has had this for a while (years?)

STRIP=-Wl,-S
SHLIB_CXXLDFLAGS = $(STRIP) -shared
SHLIB_CXX11LDFLAGS = $(STRIP) -shared
SHLIB_CXX14LDFLAGS = $(STRIP) -shared
SHLIB_CXX17LDFLAGS = $(STRIP) -shared
SHLIB_FCLDFLAGS = $(STRIP) -shared
SHLIB_LDFLAGS = $(STRIP) -shared

and I then see 67kb instead of 92kb.

edd@rob:~/git/simplercpp(master)$ install.r
* installing *source* package found in current working directory ...
* installing *source* package ‘simplercpp’ ...
** using staged installation
** libs
ccache g++ -I"/usr/share/R/include" -DNDEBUG  -I'/usr/local/lib/R/site-library/Rcpp/include'    -fpic  -g -O3 -Wall -pipe -pedantic  -c RcppExports.cpp -o RcppExports.o
ccache g++ -I"/usr/share/R/include" -DNDEBUG  -I'/usr/local/lib/R/site-library/Rcpp/include'    -fpic  -g -O3 -Wall -pipe -pedantic  -c add.cpp -o add.o
ccache g++ -Wl,-S -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o simplercpp.so RcppExports.o add.o -L/usr/lib/R/lib -lR
installing to /usr/local/lib/R/site-library/00LOCK-simplercpp/00new/simplercpp/libs
** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** testing if installed package can be loaded from temporary location
** checking absolute paths in shared objects and dynamic libraries
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (simplercpp)
edd@rob:~/git/simplercpp(master)$ ls -hl /usr/local/lib/R/site-library/simplercpp/libs/
total 68K
-rwxrwxr-x 1 edd staff 67K Jul  2 08:40 simplercpp.so
edd@rob:~/git/simplercpp(master)$ 

Might be worth mentioning. Of course, it also likely reduces the C solution size...