[Rcpp-devel] lmBenchmark broken for RcppArmadillo?

[Matt]

When I try running lmBenchmark.R I get the following error:

Rscript -e "source(system.file(\"examples\", \"lmBenchmark.R\", package =
\"RcppEigen\"))"

lm benchmark for n = 100000 and p = 40: nrep = 20

Error in .Call("fastLm", mm, y, PACKAGE = "RcppArmadillo") :

  "fastLm" not available for .Call() for package "RcppArmadillo"

Calls: source ... replicate -> sapply -> lapply -> FUN -> eval -> eval ->
.Call

Timing stopped at: 0.001 0 0

Execution halted

This happens on both Mac OS X and Ubuntu 14, with R 3.1.1, Rcpp 0.11.3,
RcppArmadillo 0.4.450.1.0, RcppEigen 0.3.2.2.0, RcppGSL 0.2.2 and
rbenchmark 1.0.0

Note that if I run do_bench() manually but remove exprs$arma then it runs
fine:

> print(do_bench())
lm benchmark for n = 100000 and p = 40: nrep = 20
     test relative elapsed user.self sys.self
3    LDLt    1.000   0.489     0.483    0.006
8     LLt    1.004   0.491     0.484    0.007
6 SymmEig    3.043   1.488     1.321    0.162
7      QR    5.681   2.778     2.612    0.166
2   PivQR    5.873   2.872     2.723    0.150
1  lm.fit    7.229   3.535     3.467    0.069
4   GESDD   18.826   9.206     8.968    0.240
5     SVD   35.307  17.265    16.893    0.376
9     GSL  140.135  68.526    68.304    0.209

RcppGSL doesn't have this problem, only RcppArmadillo.
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