Cross-platform linking of a simple front-end
Jon,
On Jul 4, 2013, at 10:52 AM, Jon Clayden wrote:
Dear all, I have a simple front-end program which uses the APIs described in section 8 of "Writing R Extensions" to deviate from the standard R behaviour in fairly minor ways. However, I'm having some difficulty getting it to link reliably across different platforms. R CMD LINK seemed like it would help, but I've had difficulty finding many real-world examples online. I've tried R CMD LINK $(R CMD config CC) $(R CMD config --cppflags) $(R CMD config --ldflags) -o ../bin/exec/tractor tractor.c and this works on one of my test platforms (OS X.8.4, R 3.0.1), but not the other (Ubuntu 12.04 LTS, R 2.14.1). In the latter case I get the error /usr/bin/ld: /tmp/ccmKf57E.o: undefined reference to symbol 'log10@ @GLIBC_2.0' /usr/bin/ld: note: 'log10@@GLIBC_2.0' is defined in DSO /lib/i386-linux-gnu/libm.so.6 so try adding it to the linker command line /lib/i386-linux-gnu/libm.so.6: could not read symbols: Invalid operation collect2: ld returned 1 exit status I can correct this by adding "-lm" manually to the command, but I'm not sure how portable that will itself be.
My guess would be that you did not use --enable-R-shlib when compiling R on Ubuntu so you don't have a shared version of the R library to link against (which is needed to resolve the dependencies). Could that be the case? Cheers, Simon
Could anyone advise on the best way to make this work portably, please? For this application I'm not concerned about Windows compatibility - portability across Unix-alikes is sufficient. The source code is at < https://github.com/jonclayden/tractor/blob/master/src/tractor.c>, if that is useful. All the best, Jon [[alternative HTML version deleted]]
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