[R-pkg-devel] Compile issues on r-devel-linux-x86_64-debian-clang with OpenMP

[Dirk Eddelbuettel]

Kurt,

Could you do me a favour and run on that clang18-using machine in question
the following one-liner (provided your session has access to a .libPaths()
including Rcpp) and, in the case of success, the resulting function?

  > Rcpp::cppFunction("int ompconfigtest() { return omp_get_num_threads(); }", includes="#include <omp.h>", plugin="openmp")
  > ompconfigtest()
  [1] 1
  > 

On a "normal" development machine such as mine here it works.

Presumably it will fail at your end because -fopenmp will not be / cannot be
substituted in from the openmp plugin defined by Rcpp:

  ## built-in OpenMP plugin
  .plugins[["openmp"]] <- function() {
      list(env = list(PKG_CXXFLAGS="-fopenmp",
                      PKG_LIBS="-fopenmp"))
  }

but it would be nice to know if that does indeed fail.

Thanks,  Dirk

-- 
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