When I install an R package with cpp codes such as rrcov via CRAN (under
R 3.1.1, using no Makevars file and under Ubuntu 14.04 using GCC 4.8),
the cpp code is compiled with the -o3 flag (in fact, looking at the
Makeconf file this seem to again be the default since R 3.1.1) But when
I install my own package via CRAN it is compiled with the -o2 flag.
My questions are what is causing my package's cpp code to be compiled in
-o2 and how to fix this?
Here is the content of the src/Makeconf file of my package (it is fairly
standard I believe for a package using RcppEigen):
PKG_CXXFLAGS = -I../inst/include -DEIGEN_DONT_PARALLELIZE
$(SHLIB_OPENMP_CXXFLAGS)
PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"`
$(SHLIB_OPENMP_CXXFLAGS)
CXX_STD = CXX11
and that of rrcov (which I m using for illustration's sake):
PKG_LIBS=$(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
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