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Why is my R package still compiling with the O2 flag?

3 messages · kaveh, Brian Ripley

Original
kaveh
# 
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)
Brian Ripley
# 
You have not given us the 'at a minimum' information required by the 
posting guide, and it is -O2 etc (not O2 and not -o2).

Also, cpp is the C pre-processor: if you mean C++, say so.

The default compiler flags are set by whoever compiled R: it is entirely 
possibly they were set differently for C++98 and C++11 (which looks 
relevant).

It seems you need to read 'R Installation and Admnistration' which has a 
comprehensive description of these flags.
On 26/09/2014 10:00, kaveh wrote:

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      kaveh
    

    

      
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Dear Prof Ripley,

Thanks for the pointer to CXX1XFLAGS: it helped me solve the problem.

As usual, thanks for your prompt and helpful answer,

Best regards,

        
On 2014-09-26 11:30, Prof Brian Ripley wrote: