On Dec 23, 2012, at 9:22 PM, Matthew Dowle wrote: > > Hi, > > Similar questions have come up before on the list and elsewhere but I haven't > found a solution yet. > > winbuilder's install.out shows data.table's .c files compiled with -O3 on > Win32 but -O2 on Win64. The same happens on R-Forge. I gather that some > packages don't work with -O3 so the default is -O2. > > I've tried this in data.table's Makevars (entire contents) : > > ==== > MAKEFLAGS="CFLAGS=-O3" # added > CFLAGS=-O3 # added > PKG_CFLAGS=-O3 # added > all: $(SHLIB) # no change > mv $(SHLIB) datatable$(SHLIB_EXT) # no change > ==== > > but -O2 still appears in winbuilder's install.out (after -O3, and I believe > the last -O is the one that counts) : > > gcc -m64 -I"D:/RCompile/recent/R-2.15.2/include" -DNDEBUG > -I"d:/Rcompile/CRANpkg/extralibs215/local215/include" -O3 -O2 -Wall > -std=gnu99 -mtune=core2 -c dogroups.c -o dogroups.o > > How can I ensure that data.table is compiled with -O3 on Win64? >
You can't - at least not in a way that doesn't circumvent the R build system. Also it's not portable so you don't want to mess with optimization flags and hard-code it in your package as it's user's choice how they setup R and its flags. You can certainly setup your R to compile with -O3, you just can't impose that on others. Cheers, Simon ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
