[geos-devel] 3.10.0beta1

[Roger Bivand]

On Fri, 1 Oct 2021, Greg Troxel wrote:

> Paul Ramsey <pramsey at cleverelephant.ca> writes:
>
>> That feels... off the reservation for a library and something for the final build? Like, not every platform requires that link, I don't think.
>
> My quick reaction is that -lstdc++ seems funny for things that are
> compiled as C++, but if there's a link line intended to be called in a C
> build that's perhaps something else.   I'll see how that turns out on
> NetBSD shortly.
>

Yes, R is C not C++, so the R contributed package (rgeos, sf, ...) DLL on 
Windows from msys2 is seen as C rather than C++, see for example:

https://developer.r-project.org/Blog/public/2019/03/28/use-of-c-in-packages/index.html

for a discussion of general issues. The specific need here is triggered 
when building binary contributed packages for macOS and Windows (here the 
Windows case with gcc and msys2). See also:

https://github.com/rsbivand/foss4g21/blob/main/bivand_foss4g_210930.pdf

from the FOSS4G R-spatial panel two days ago, slides 2-3.

Roger

-- 
Roger Bivand
Emeritus Professor
Department of Economics, Norwegian School of Economics,
Postboks 3490 Ytre Sandviken, 5045 Bergen, Norway.
e-mail: Roger.Bivand at nhh.no
https://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en