Kasper Daniel Hansen wrote: > Hi > > I can use PKG_CPPFLAGS in a Makevars file to add additional flags to > the c++ compiler for a given package. Is it possible to remove flags > passed to the packages from R. Eg: say R have been compiled with -O2 > and I want the package to be compiled with another optimization level?
Do you mean the flags passed to the c++ compiler (CXXFLAGS) or to the C proprocessor (CPPFLAGS)? Do not confuse the two. I think the "proper" way would be to write a full makefile. (there are plenty of examples on CRAN). Now, out of curiosity - why would you want to do that? The actual difference in CPU time usage is often small (10%?), so unless the package triggers a compiler bug at specific optimization level and gets mis-compiled, it is probably not worth the trouble. And if the package is that sensitive to optimization level and can get mis-compiled, one of them (the package or the compiler) needs fixing. HTL ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
