[Rcpp-devel] GNU extension in makefile

[Jeff Newmiller]

Alternatively, you might not need that file at all since Rcpp handles simple cases without it. [1]

[1] https://www.mail-archive.com/rcpp-devel@lists.r-forge.r-project.org/msg09485.html

On June 23, 2018 8:31:20 AM PDT, Dirk Eddelbuettel <edd at debian.org> wrote:
>
>On 24 June 2018 at 03:22, Murray Efford wrote:
>| The RcppParallel introduction at
>https://rcppcore.github.io/RcppParallel/
>| instructs package writers to include a Makevars file with
>| 
>| PKG_LIBS += $(shell ${R_HOME}/bin/Rscript -e
>"RcppParallel::RcppParallelLibs()")
>| 
>| However, R CMD check in R 3.5.0 generates a warning apparently
>because +=
>| and $(shell are non-portable GNU extensions. As a Windows user I'm
>not
>| familiar with makefiles and am not confident to work around this. Am
>I
>| missing something, or is there a simple solution? An update to the
>| introduction would be welcome.
>
>Two things:
>
>i)  _Every_ R package which needs a Makevars _on Windows_ uses
>    src/Makevars.win -- see "Writing R Extensions"
>
>ii) If one needs GNU make, one can declare the dependency in
>DESCRIPTION via
>    SystemRequirements: -- again, see "Writing R Extensions"
>
>And we have just that:
>
>SystemRequirements:	GNU make, Windows: cmd.exe and cscript.exe,
>Solaris: g++ is required
>
>Does that answer your question?  If not, did you look at user
>reverse-depends
>of RcppParallel and examine what they do?  One can often copy working
>solution s from other packages...
>
>Dirk

-- 
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