[Rcpp-devel] undefined symbol: clock_gettime in Rcpp 0.10.2

[Yan Zhou]

-lrt is required on Linux. On other platform it will generate an error instead  since librt is Linux specific.

Yan

On Dec 24, 2012, at 10:31 AM, Martin Morgan <mtmorgan at fhcrc.org> wrote:

> When trying to install Rcpp 0.10.2 with
> 
> $ R --version
> R Under development (unstable) (2012-12-18 r61372) -- "Unsuffered Consequences"
> $ clang++ --version
> Ubuntu clang version 3.0-6ubuntu3 (tags/RELEASE_30/final) (based on LLVM 3.0)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> 
> I get
> 
> $ R CMD INSTALL Rcpp_0.10.2.tar.gz
> ...
> clang++ -I/home/mtmorgan/bin/R-devel/include -DNDEBUG -I../inst/include/ -I/usr/local/include    -fpic  -g -O2  -c Timer.cpp -o Timer.o
> ...
> ** testing if installed package can be loaded
> Error in dyn.load(file, DLLpath = DLLpath, ...) :
>  unable to load shared object '/home/mtmorgan/R/x86_64-unknown-linux-gnu-library/2.16/Rcpp/libs/Rcpp.so':
>  /home/mtmorgan/R/x86_64-unknown-linux-gnu-library/2.16/Rcpp/libs/Rcpp.so: undefined symbol: clock_gettime
> Error: loading failed
> 
> From man clock_gettime I have
> 
> ...
>       Link with -lrt.
> 
> and adding PKG_LIBS += -lrt to src/Makevars addresses the problem for me, but I'm not sure that is a universal solution? Also, I had an identical problem with another package (Matrix, since corrected) so there is perhaps something a-typical about my configuration.
> 
> Martin
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