[Rd] problem customizing CXXFLAGS in Windows
ianfiske at gmail.com
Fri Apr 18 18:25:28 CEST 2008
I am running R 2.6.2 in Windows XP with Rtools 2.7 and am trying to compile
a shared library in Windows with customized level of optimization.
Specifically, I would like to have "-O3 -funroll-loops" as flags when I run
"R CMD SHLIB ***.cc" to speed the program for my simulations.
I have read through the documentation and have tried adding the line
PKG_CXXFLAGS = -O3 -funroll-loops
in my Makevars in my package's src directory. However, this places the
flags before the -O2 flag, thereby overriding it. I have also tried
creating a config.site file in R_HOME/etc, but that seems to be ignored.
I found a possible solution at
http://tolstoy.newcastle.edu.au/R/e2/devel/07/03/2520.html. However, when I
use this suggestion, I get errors that R.h cannot be found.
Please note that I do not plan to submit this package to CRAN or to other
users with the modified flags, but I just need to set them on my machine to
speed up simulations for testing, etc.
I appreciate any suggestions,
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