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

[kaveh]

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:
> 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:
>> 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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>
>