EXTPTR_PTR is not in the API so it is not guaranteed to even exist in
the future. The API function for accessing the pointer address is
R_ExternalPtrAddr. See Section 5.13 in WRE.
Sometimes internals need to be changed, In this case a change was made
to deal with a segfault; the commit notice tells you the PR this
addressed.
As it says in Writing R Extensions about defining USE_RINTERNALS:
Also be prepared to adjust your code should R internals change.
The same goes for any use of non-API macros and functions.
Best,
luke
On Mon, 29 Jun 2020, Gábor Csárdi wrote:
Hi all,
it seems that from R 4.0.1 EXTPTR_PTR can be either a macro or a
function, depending on whether USE_RINTERNALS is requested.
Jeroen helped me find that this was in 78592:
https://github.com/wch/r-source/commit/c634fec5214e73747b44d7c0e6f047fefe44667d
This is a problem, because binary packages that are built on R 4.0.1
or R 4.0.2 will potentially not load on R 4.0.0, if they use the
EXTPTR_PTR function.
E.g. this is R 4.0.0 on Linux:
library(Rcpp)
Error: package or namespace load failed for ‘Rcpp’ in dyn.load(file,
DLLpath = DLLpath, ...):
unable to load shared object '/usr/local/lib/R/library/Rcpp/libs/Rcpp.so':
Error relocating /usr/local/lib/R/library/Rcpp/libs/Rcpp.so:
EXTPTR_PTR: symbol not found
In addition: Warning message:
package ‘Rcpp’ was built under R version 4.0.1
It is easiest to reproduce this on Windows, because the CRAN binaries
are now built on R 4.0.2, so if you install Rcpp on R 4.0.0 from CRAN,
and try to load it you'll get:
library(Rcpp)
Error: package or namespace load failed for 'Rcpp' in inDL(x,
as.logical(local), as.logical(now), ...):
unable to load shared object
'C:/Users/csard/R/win-library/4.0/Rcpp/libs/x64/Rcpp.dll':
LoadLibrary failure: The specified procedure could not be found.
In addition: Warning message:
package 'Rcpp' was built under R version 4.0.2
I suppose this change was not intended?
Best,
Gabor
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Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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