[Rcpp-devel] Large size of libs directory on some systems

[Dirk Eddelbuettel]

On 28 November 2016 at 21:13, Dean Bodenham wrote:
| Dear Dirk,
| 
| Thank you for your last email - your suggestion worked perfectly!
| 
| To be clear (for others), creating a ~/.R/Makevars file containing:
| 
| DYLIB_LDFLAGS = -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
| SHLIB_CXXLDFLAGS = -shared
| SHLIB_CXX1XLDFLAGS = -shared
| SHLIB_FCLDFLAGS = -shared
| SHLIB_LDFLAGS = -shared# $(CFLAGS) $(CPICFLAGS)
| PKG_LIBS= -Wl,-S
| 
| (where the first five lines are from /etc/R/Makeconf) resulted in a much
| smaller ffstream.so for me on Ubuntu 16.04.

Not quite what I meant.  You can't "hog" PKG_LIBS as some package use it (eg
for RcppArmadillo).  Try

DYLIB_LDFLAGS = -Wl,-S -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
SHLIB_CXXLDFLAGS = -Wl,-S -shared
SHLIB_CXX1XLDFLAGS = -Wl,-S -shared
SHLIB_FCLDFLAGS = -Wl,-S -shared
SHLIB_LDFLAGS = -Wl,-S -shared# $(CFLAGS) $(CPICFLAGS)

instead.

Dirk


| 
| I have just started playing around with Dan's r-stripper, but have not quite
| got it working yet.
| 
| Dean 
| 
| On Sat, Nov 26, 2016 at 4:59 PM, Dan Dillon <dcdillon at gmail.com> wrote:
| 
|     Dean,
| 
|     I too have been concerned about this and working on a solution for some
|     time.  I just formalized my work and put it in a repo at https://github.com
|     /dcdillon/r-stripper.  Basically this script adds the appropriate commands
|     to the PKG_LIBS variable to cause the linker to strip the debugging symbols
|     from the shared library that is created.
| 
|     Feel free to try it out.  Right now it only knows how to do this for gcc,
|     g++, clang, and clang++ but adding others is no problem as long as I know
|     how to figure out which linker it is and know the option to pass to the
|     linker to achieve "stripping".
| 
|     Thanks,
| 
|     Dan
| 
|     On Sat, Nov 26, 2016 at 7:55 AM, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
|        
|         On 26 November 2016 at 12:22, Dean Bodenham wrote:
|         | Dear Dirk, 
|         |
|         | Thank you very much for your detailed replies! 
|         |
|         | The Ubuntu system does indeed seem to be using the -g flag. I did try
|         a local
|         | compile/installation with the ~/.R/Makevars file you suggested, but
|         couldn't
|         | quite get it to work - I get warnings "linking not done" for the .o
|         files, and
|         | then an error that the "ffstream.so" file is not found.
| 
|         Well "it worked me for" but a better approach entirely outside of your
|         package may be to take
| 
|           edd at max:~$ grep shared /etc/R/Makeconf
|           DYLIB_LDFLAGS = -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
|           SHLIB_CXXLDFLAGS = -shared
|           SHLIB_CXX1XLDFLAGS = -shared
|           SHLIB_FCLDFLAGS = -shared
|           SHLIB_LDFLAGS = -shared# $(CFLAGS) $(CPICFLAGS)
|           edd at max:~$
| 
|         and add them to ~/.R/Makevars as
| 
|           DYLIB_LDFLAGS = -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
|           SHLIB_CXXLDFLAGS = -shared
|           SHLIB_CXX1XLDFLAGS = -shared
|           SHLIB_FCLDFLAGS = -shared
|           SHLIB_LDFLAGS = -shared# $(CFLAGS) $(CPICFLAGS)
| 
|         When I do that without/with the change I get
| 
|           edd at max:/tmp/ffstream$ ls -lh ffstream*/src/ffstream.so
|           -rwxrwxr-x 1 edd edd 9.0M Nov 26 07:52 ffstream.orig/src/ffstream.so
|           -rwxrwxr-x 1 edd edd 734K Nov 26 07:52 ffstream/src/ffstream.so
|           edd at max:/tmp/ffstream$
| 
|         I think it is an issue worth raising with on r-devel and I may do so.
|        
|         Dirk
| 
|         --
|         http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
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| 
| 
| 

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