[R-SIG-Mac]Compiling R libraries on MAC OS X

[Jan de Leeuw]

If you use flat namespaces you cannot have multiple definitions of  
symbols,
because the linked application has no way of knowing which definition
you meant. There are a number of ways to deal with this. You can use
two-level namespaces (which give warnings for multiple definitions)

> gcc -bundle -bundle-loader /usr/local/lib/R/bin/R.bin -undefined error  
> -L/sw/lib -L/usr/local/lib -o sjevor.so edgelist.o geometry.o heap.o  
> main.o memory.o output.o sjevor.o voronoi.o

You can change the C code such that all definitions but one use extern  
(this is best). And you can force the link by adding the
-m flag, which also transforms errors to warnings, i.e.

> gcc -bundle -flat_namespace -undefined suppress -Xlinker -m -L/sw/lib  
> -L/usr/local/lib -o sjevor.so edgelist.o geometry.o heap.o main.o  
> memory.o output.o sjevor.o voronoi.o


On Wednesday, Feb 26, 2003, at 15:31 US/Pacific, Stephen Eglen wrote:

>
> Hi,
> can anyone help me with the following problem?
>
> [Using R-1.6.2 patched on Mac OS X 10.2.4, Developer tools from  
> ~August?]
>
> I have made four personal R libaries on Linux, and I'm trying to get
> them to work on Mac OS X.  All of them have C code that is called from
> R using .C().  Three out of the four work fine, but when I try to
> compile one of them (a Voronoi library, based on Steve Fortune's code)
> ld complains.
>
> % R CMD check sjevor
>
> * checking for working latex ... OK
> * using log directory '/Users/stephen/langs/R/sjevor.Rcheck'
> * checking for file 'sjevor/DESCRIPTION' ... OK
> * checking if this is a source package ... OK
> * Installing *source* package 'sjevor' ...
> ** libs
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c edgelist.c -o  
> edgelist.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c geometry.c -o  
> geometry.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c heap.c -o heap.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c main.c -o main.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c memory.c -o memory.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c output.c -o output.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c sjevor.c -o sjevor.o
> gcc -no-cpp-precomp -I/usr/local/lib/R/include  -I/sw/include  
> -I/usr/local/include  -g -fno-common  -g -O2 -c voronoi.c -o voronoi.o
> gcc -bundle -flat_namespace -undefined suppress -L/sw/lib  
> -L/usr/local/lib -o sjevor.so edgelist.o geometry.o heap.o main.o  
> memory.o output.o sjevor.o voronoi.o
> ld: multiple definitions of symbol _ELhash
> edgelist.o definition of _ELhash in section (__DATA,__common)
> geometry.o definition of _ELhash in section (__DATA,__common)
> ld: multiple definitions of symbol _ELhashsize
> edgelist.o definition of _ELhashsize in section (__DATA,__common)
> geometry.o definition of _ELhashsize in section (__DATA,__common)
> ld: multiple definitions of symbol _ELleftend
> ...
>
> ld produces many similar complaints, before the build fails.
>
> Has anyone else come across this problem? The package builds fine on
> my linux box.
>
> Thanks for any pointers,
> Stephen
>
> _______________________________________________
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> R-SIG-Mac@stat.math.ethz.ch
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>
>
===
Jan de Leeuw; Professor and Chair, UCLA Department of Statistics;
Editor: Journal of Multivariate Analysis, Journal of Statistical  
Software
US mail: 9432 Boelter Hall, Box 951554, Los Angeles, CA 90095-1554
phone (310)-825-9550;  fax (310)-206-5658;  email: deleeuw@stat.ucla.edu
homepage: http://gifi.stat.ucla.edu
   
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