Cross-compilation

Thu, Nov 2, 2006 7:38 AM

You might be better off using the same g++ as distributed and found on 
Prof Ripley's web site, rather than the newer 4.x:

$ /home/hin-tak/mingw-cross/bin/i586-mingw32-c++  --version
i586-mingw32-c++ (GCC) 3.4.5 (mingw special)
...

Name-mangling and C++ ABI had changed between gcc 3.x and 4.x, so 
compiling c++ programs might be different.

It had worked out-of-the-box for me when I was using fedora 5 x86_64
(I just upgraded to fedora 6 yesterday, and I haven't tried doing
any cross-compiling yet). So fc4 probably should work.

HTH,
Hin-Tak Leung

Tom McCallum wrote:

Thanks for your reply, as an example it appears to have difficulty linking  
to even ostream library of the standard C++, as shown below:

/home/tmccallum/ritzel/RItzel/src/Classifier.cpp:209: undefined reference  
to `_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc'
Classifier.o: In function `operator<<':
/usr/lib/gcc/i386-redhat-linux/4.0.2/../../../../include/c++/4.0.2/ostream:218:  
undefined reference to `_ZNSolsEd'
/usr/lib/gcc/i386-redhat-linux/4.0.2/../../../../include/c++/4.0.2/ostream:196:  
undefined reference to `_ZNSolsEl'

I am currently working R-2.4.0 as downloaded today.

I know the g++ has gone through some alterations and wondered if you knew  
the version of g++ you cross-compiled your package with for comparison -  
mine is g++ (GCC) 4.0.2 20051125 (Red Hat 4.0.2-8).

Many thanks

Tom


On Wed, 25 Oct 2006 18:10:40 +0100, Ramon Diaz-Uriarte <rdiaz at cnio.es>  
wrote:

Dear Tom,

It has worked for me out-of-the box in at least two times, one a while  
ago
with R-2.2-something and recently with R-2.4.0. In both cases, I was  
running
Debian (with a mix of testing and unstable) on x86. I never had to do
anything, just run the script and at least in one case I did  
crosscompile a
package with C++.


R.

On Wednesday 25 October 2006 18:03, Tom McCallum wrote:

Hi everyone,

I am trying to cross-compile a package I wrote using the Yan and Rossini
tutorial "Building Microsoft Windows versions of R and R packages using
Intel Linux".  I have got reasonably far with this but when doing the
linking using the line:

i586-mingw32-g++  -shared -s  -o mylibrary.dll mylibrary.def mylibrary.o
mylibrary_res.o  -L/my/path/RCrossBuild/WinR/R-2.4.0/bin -lR

I get lots of these type of messages:
/my/path/to/mylibrary.cpp:43: undefined reference to
`_GLOBAL_OFFSET_TABLE_'

and other similar linker errors for virtually every object and command  
in
the program.  After some googling I have found that there may be  
problems
with the libgcc.a library and its default -fPIC argument during
compilation.

Has anyone got this tutorial to work and if so how did they overcome  
this?

I am attempting to do this on Fedora Core 4 on a 32-bit machine, having
completed all the previous sections of the tutorial for building a
cross-platform version of R.

Many thanks

Tom