[Rcpp-devel] how to pass -fPIC instead of -fpic when building rccp package

[Dirk Eddelbuettel]

Anwar,

On 12 July 2013 at 01:42, Anwar Ludin wrote:
| Yes I agree, I'm just having issues with the way the build process works, so let's make it a Rcpp problem ;)
| 
| >library(Rcpp)
| >Rcpp.package.skeleton("testpackage")
| 
| R CMD INSTALL --preclean --no-multiarch testpackage
| 
| icpc -I/usr/include/R -DNDEBUG  -I/usr/local/include -I"/usr/lib64/R/library/Rcpp/include"   -fpic  -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic  -c rcpp_hello_world.cpp -o rcpp_hello_world.o
| icpc -shared -L/usr/local/lib64 -o testpackage.so rcpp_hello_world.o -L/usr/lib64/R/library/Rcpp/lib -lRcpp -Wl,-rpath,/usr/lib64/R/library/Rcpp/lib -L/usr/lib64/R/lib -lR
| installing to /home/aludin/R/x86_64-redhat-linux-gnu-library/3.0/testpackage/libs
| 
| Here I'm using the Intel compiler as specified in my ~/.R/Makevars file:
| 
| CC=icc
| CXX=icpc
| CFLAGS=-g -O -mtune=native
| 
| So basically I have no idea where all the extra flags come from, in particular -fexceptions -fstack-protector & -fpic
| 
| I want to get rid of the -fstack-protector & -fpic flags

I suspect these stem from R's own configuration, set at its compile time.
Try this:

edd at max:~$ R CMD config CPPFLAGS

edd at max:~$ R CMD config CXXFLAGS 
-g -O3 -Wall -pipe -Wno-unused -pedantic
edd at max:~$ R CMD config CXXPICFLAGS
-fpic
edd at max:~$ 

See 'R CMD CONFIG --help' for more, and the $RHOME/etc/Makeconf file for the
settings.

Dirk

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com